README.md

✏️ Leetcode Solutions with Python

Update time: 2019-06-15 22:13:48

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#	Title	Source Code	Article	Difficulty
1	two-sum	Python	📝	Easy
2	add-two-numbers	Python	📝	Medium
3	longest-substring-without-repeating-characters		📝	Medium
4	median-of-two-sorted-arrays		📝	Hard
5	longest-palindromic-substring		📝	Medium
6	zigzag-conversion		📝	Medium
7	reverse-integer	Python	📝	Easy
8	string-to-integer-atoi	Python		Medium
9	palindrome-number	Python	📝	Easy
10	regular-expression-matching		📝	Hard
11	container-with-most-water		📝	Medium
12	integer-to-roman			Medium
13	roman-to-integer	Python		Easy
14	longest-common-prefix	Python	📝	Easy
15	3sum			Medium
16	3sum-closest			Medium
17	letter-combinations-of-a-phone-number		📝	Medium
18	4sum			Medium
19	remove-nth-node-from-end-of-list		📝	Medium
20	valid-parentheses		📝	Easy
21	merge-two-sorted-lists	Python	📝	Easy
22	generate-parentheses		📝	Medium
23	merge-k-sorted-lists		📝	Hard
24	swap-nodes-in-pairs			Medium
25	reverse-nodes-in-k-group			Hard
26	remove-duplicates-from-sorted-array		📝	Easy
27	remove-element		📝	Easy
28	implement-strstr	Python		Easy
29	divide-two-integers			Medium
30	substring-with-concatenation-of-all-words			Hard
31	next-permutation		📝	Medium
32	longest-valid-parentheses		📝	Hard
33	search-in-rotated-sorted-array		📝	Medium
34	find-first-and-last-position-of-element-in-sorted-array	Python	📝	Medium
35	search-insert-position	Python		Easy
36	valid-sudoku		📝	Medium
37	sudoku-solver		📝	Hard
38	count-and-say			Easy
39	combination-sum			Medium
40	combination-sum-ii			Medium
41	first-missing-positive		📝	Hard
42	trapping-rain-water		📝	Hard
43	multiply-strings			Medium
44	wildcard-matching		📝	Hard
45	jump-game-ii			Hard
46	permutations		📝	Medium
47	permutations-ii			Medium
48	rotate-image		📝	Medium
49	group-anagrams		📝	Medium
50	powx-n	Python	📝	Medium
51	n-queens		📝	Hard
52	n-queens-ii		📝	Hard
53	maximum-subarray		📝	Easy
54	spiral-matrix		📝	Medium
55	jump-game		📝	Medium
56	merge-intervals		📝	Medium
57	insert-interval		📝	Hard
58	length-of-last-word	Python		Easy
59	spiral-matrix-ii			Medium
60	permutation-sequence			Medium
61	rotate-list		📝	Medium
62	unique-paths			Medium
63	unique-paths-ii		📝	Medium
64	minimum-path-sum		📝	Medium
65	valid-number	Python		Hard
66	plus-one	Python		Easy
67	add-binary	Python		Easy
68	text-justification			Hard
69	sqrtx			Easy
70	climbing-stairs	Python	📝	Easy
71	simplify-path			Medium
72	edit-distance		📝	Hard
73	set-matrix-zeroes		📝	Medium
74	search-a-2d-matrix		📝	Medium
75	sort-colors		📝	Medium
76	minimum-window-substring		📝	Hard
77	combinations		📝	Medium
78	subsets			Medium
79	word-search			Medium
80	remove-duplicates-from-sorted-array-ii			Medium
81	search-in-rotated-sorted-array-ii			Medium
82	remove-duplicates-from-sorted-list-ii			Medium
83	remove-duplicates-from-sorted-list	Python	📝	Easy
84	largest-rectangle-in-histogram		📝	Hard
85	maximal-rectangle		📝	Hard
86	partition-list		📝	Medium
87	scramble-string			Hard
88	merge-sorted-array		📝	Easy
89	gray-code			Medium
90	subsets-ii			Medium
91	decode-ways			Medium
92	reverse-linked-list-ii		📝	Medium
93	restore-ip-addresses		📝	Medium
94	binary-tree-inorder-traversal		📝	Medium
95	unique-binary-search-trees-ii		📝	Medium
96	unique-binary-search-trees		📝	Medium
97	interleaving-string		📝	Hard
98	validate-binary-search-tree		📝	Medium
99	recover-binary-search-tree			Hard
100	same-tree	Python	📝	Easy
101	symmetric-tree		📝	Easy
102	binary-tree-level-order-traversal		📝	Medium
103	binary-tree-zigzag-level-order-traversal			Medium
104	maximum-depth-of-binary-tree	Python	📝	Easy
105	construct-binary-tree-from-preorder-and-inorder-traversal		📝	Medium
106	construct-binary-tree-from-inorder-and-postorder-traversal		📝	Medium
107	binary-tree-level-order-traversal-ii			Easy
108	convert-sorted-array-to-binary-search-tree	Python		Easy
109	convert-sorted-list-to-binary-search-tree		📝	Medium
110	balanced-binary-tree			Easy
111	minimum-depth-of-binary-tree		📝	Easy
112	path-sum	Python	📝	Easy
113	path-sum-ii			Medium
114	flatten-binary-tree-to-linked-list			Medium
115	distinct-subsequences			Hard
116	populating-next-right-pointers-in-each-node			Medium
117	populating-next-right-pointers-in-each-node-ii			Medium
118	pascals-triangle	Python	📝	Easy
119	pascals-triangle-ii	Python		Easy
120	triangle			Medium
121	best-time-to-buy-and-sell-stock		📝	Easy
122	best-time-to-buy-and-sell-stock-ii		📝	Easy
123	best-time-to-buy-and-sell-stock-iii			Hard
124	binary-tree-maximum-path-sum		📝	Hard
125	valid-palindrome	Python		Easy
126	word-ladder-ii			Hard
127	word-ladder		📝	Medium
128	longest-consecutive-sequence		📝	Hard
129	sum-root-to-leaf-numbers			Medium
130	surrounded-regions			Medium
131	palindrome-partitioning			Medium
132	palindrome-partitioning-ii			Hard
133	clone-graph			Medium
134	gas-station		📝	Medium
135	candy		📝	Hard
136	single-number		📝	Easy
137	single-number-ii			Medium
138	copy-list-with-random-pointer		📝	Medium
139	word-break		📝	Medium
140	word-break-ii		📝	Hard
141	linked-list-cycle		📝	Easy
142	linked-list-cycle-ii		📝	Medium
143	reorder-list			Medium
144	binary-tree-preorder-traversal		📝	Medium
145	binary-tree-postorder-traversal		📝	Hard
146	lru-cache		📝	Medium
147	insertion-sort-list			Medium
148	sort-list			Medium
149	max-points-on-a-line		📝	Hard
150	evaluate-reverse-polish-notation			Medium
151	reverse-words-in-a-string			Medium
152	maximum-product-subarray			Medium
153	find-minimum-in-rotated-sorted-array		📝	Medium
154	find-minimum-in-rotated-sorted-array-ii			Hard
155	min-stack	Python		Easy
156	binary-tree-upside-down	🔒		Medium
157	read-n-characters-given-read4	🔒		Easy
158	read-n-characters-given-read4-ii-call-multiple-times	🔒		Hard
159	longest-substring-with-at-most-two-distinct-characters	🔒	📝	Hard
160	intersection-of-two-linked-lists		📝	Easy
161	one-edit-distance	🔒	📝	Medium
162	find-peak-element	Python	📝	Medium
163	missing-ranges	🔒		Medium
164	maximum-gap		📝	Hard
165	compare-version-numbers	Python		Medium
166	fraction-to-recurring-decimal		📝	Medium
167	two-sum-ii-input-array-is-sorted	Python	📝	Easy
168	excel-sheet-column-title			Easy
169	majority-element	Python	📝	Easy
170	two-sum-iii-data-structure-design	🔒		Easy
171	excel-sheet-column-number			Easy
172	factorial-trailing-zeroes			Easy
173	binary-search-tree-iterator		📝	Medium
174	dungeon-game			Hard
179	largest-number		📝	Medium
186	reverse-words-in-a-string-ii	🔒		Medium
187	repeated-dna-sequences			Medium
188	best-time-to-buy-and-sell-stock-iv			Hard
189	rotate-array		📝	Easy
190	reverse-bits	Python		Easy
191	number-of-1-bits	Python	📝	Easy
198	house-robber		📝	Easy
199	binary-tree-right-side-view		📝	Medium
200	number-of-islands		📝	Medium
201	bitwise-and-of-numbers-range			Medium
202	happy-number	Python		Easy
203	remove-linked-list-elements			Easy
204	count-primes			Easy
205	isomorphic-strings	Python		Easy
206	reverse-linked-list	Python	📝	Easy
207	course-schedule			Medium
208	implement-trie-prefix-tree		📝	Medium
209	minimum-size-subarray-sum		📝	Medium
210	course-schedule-ii		📝	Medium
211	add-and-search-word-data-structure-design			Medium
212	word-search-ii			Hard
213	house-robber-ii			Medium
214	shortest-palindrome		📝	Hard
215	kth-largest-element-in-an-array	Python	📝	Medium
216	combination-sum-iii			Medium
217	contains-duplicate	Python	📝	Easy
218	the-skyline-problem		📝	Hard
219	contains-duplicate-ii		📝	Easy
220	contains-duplicate-iii		📝	Medium
221	maximal-square		📝	Medium
222	count-complete-tree-nodes			Medium
223	rectangle-area			Medium
224	basic-calculator			Hard
225	implement-stack-using-queues	Python	📝	Easy
226	invert-binary-tree	Python	📝	Easy
227	basic-calculator-ii			Medium
228	summary-ranges		📝	Medium
229	majority-element-ii			Medium
230	kth-smallest-element-in-a-bst		📝	Medium
231	power-of-two	Python		Easy
232	implement-queue-using-stacks	Python	📝	Easy
233	number-of-digit-one		📝	Hard
234	palindrome-linked-list	Python		Easy
235	lowest-common-ancestor-of-a-binary-search-tree		📝	Easy
236	lowest-common-ancestor-of-a-binary-tree		📝	Medium
237	delete-node-in-a-linked-list		📝	Easy
238	product-of-array-except-self		📝	Medium
239	sliding-window-maximum		📝	Hard
240	search-a-2d-matrix-ii		📝	Medium
241	different-ways-to-add-parentheses			Medium
242	valid-anagram	Python	📝	Easy
243	shortest-word-distance	🔒	📝	Easy
244	shortest-word-distance-ii	🔒	📝	Medium
245	shortest-word-distance-iii	🔒		Medium
246	strobogrammatic-number	🔒		Easy
247	strobogrammatic-number-ii	🔒		Medium
248	strobogrammatic-number-iii	🔒		Hard
249	group-shifted-strings	🔒		Medium
250	count-univalue-subtrees	🔒	📝	Medium
251	flatten-2d-vector	🔒		Medium
252	meeting-rooms	🔒	📝	Easy
253	meeting-rooms-ii	🔒	📝	Medium
254	factor-combinations	🔒		Medium
255	verify-preorder-sequence-in-binary-search-tree	🔒		Medium
256	paint-house	🔒		Easy
257	binary-tree-paths		📝	Easy
258	add-digits	Python		Easy
259	3sum-smaller	🔒	📝	Medium
260	single-number-iii	Python		Medium
261	graph-valid-tree	🔒		Medium
263	ugly-number	Python		Easy
264	ugly-number-ii			Medium
265	paint-house-ii	🔒		Hard
266	palindrome-permutation	🔒	📝	Easy
267	palindrome-permutation-ii	🔒	📝	Medium
268	missing-number		📝	Easy
269	alien-dictionary	🔒		Hard
270	closest-binary-search-tree-value	🔒		Easy
271	encode-and-decode-strings	🔒		Medium
272	closest-binary-search-tree-value-ii	🔒		Hard
273	integer-to-english-words		📝	Hard
274	h-index		📝	Medium
275	h-index-ii			Medium
276	paint-fence	🔒		Easy
277	find-the-celebrity	🔒		Medium
278	first-bad-version	Python	📝	Easy
279	perfect-squares			Medium
280	wiggle-sort	🔒	📝	Medium
281	zigzag-iterator	🔒		Medium
282	expression-add-operators		📝	Hard
283	move-zeroes		📝	Easy
284	peeking-iterator			Medium
285	inorder-successor-in-bst	🔒		Medium
286	walls-and-gates	🔒	📝	Medium
287	find-the-duplicate-number		📝	Medium
288	unique-word-abbreviation	🔒	📝	Medium
289	game-of-life		📝	Medium
290	word-pattern	Python		Easy
291	word-pattern-ii	🔒		Hard
292	nim-game		📝	Easy
293	flip-game	🔒		Easy
294	flip-game-ii	🔒		Medium
295	find-median-from-data-stream		📝	Hard
296	best-meeting-point	🔒	📝	Hard
297	serialize-and-deserialize-binary-tree		📝	Hard
298	binary-tree-longest-consecutive-sequence	🔒	📝	Medium
299	bulls-and-cows			Medium
300	longest-increasing-subsequence		📝	Medium
301	remove-invalid-parentheses		📝	Hard
302	smallest-rectangle-enclosing-black-pixels	🔒	📝	Hard
303	range-sum-query-immutable	Python	📝	Easy
304	range-sum-query-2d-immutable		📝	Medium
305	number-of-islands-ii	🔒	📝	Hard
306	additive-number			Medium
307	range-sum-query-mutable		📝	Medium
308	range-sum-query-2d-mutable	🔒		Hard
309	best-time-to-buy-and-sell-stock-with-cooldown			Medium
310	minimum-height-trees			Medium
311	sparse-matrix-multiplication	🔒		Medium
312	burst-balloons			Hard
313	super-ugly-number			Medium
314	binary-tree-vertical-order-traversal	🔒		Medium
315	count-of-smaller-numbers-after-self			Hard
316	remove-duplicate-letters			Hard
317	shortest-distance-from-all-buildings	🔒		Hard
318	maximum-product-of-word-lengths			Medium
319	bulb-switcher			Medium
320	generalized-abbreviation	🔒	📝	Medium
321	create-maximum-number			Hard
322	coin-change		📝	Medium
323	number-of-connected-components-in-an-undirected-graph	🔒		Medium
324	wiggle-sort-ii			Medium
325	maximum-size-subarray-sum-equals-k	🔒		Medium
326	power-of-three	Python	📝	Easy
327	count-of-range-sum			Hard
328	odd-even-linked-list		📝	Medium
329	longest-increasing-path-in-a-matrix		📝	Hard
330	patching-array		📝	Hard
331	verify-preorder-serialization-of-a-binary-tree			Medium
332	reconstruct-itinerary			Medium
333	largest-bst-subtree	🔒		Medium
334	increasing-triplet-subsequence			Medium
335	self-crossing			Hard
336	palindrome-pairs			Hard
337	house-robber-iii			Medium
338	counting-bits	Python	📝	Medium
339	nested-list-weight-sum	🔒	📝	Easy
340	longest-substring-with-at-most-k-distinct-characters	🔒	📝	Hard
341	flatten-nested-list-iterator			Medium
342	power-of-four	Python		Easy
343	integer-break			Medium
344	reverse-string	Python		Easy
345	reverse-vowels-of-a-string			Easy
346	moving-average-from-data-stream	🔒		Easy
347	top-k-frequent-elements	Python	📝	Medium
348	design-tic-tac-toe	🔒		Medium
349	intersection-of-two-arrays	Python	📝	Easy
350	intersection-of-two-arrays-ii	Python		Easy
351	android-unlock-patterns	🔒	📝	Medium
352	data-stream-as-disjoint-intervals			Hard
353	design-snake-game	🔒		Medium
354	russian-doll-envelopes			Hard
355	design-twitter			Medium
356	line-reflection	🔒		Medium
357	count-numbers-with-unique-digits			Medium
358	rearrange-string-k-distance-apart	🔒		Hard
359	logger-rate-limiter	🔒		Easy
360	sort-transformed-array	🔒		Medium
361	bomb-enemy	🔒		Medium
362	design-hit-counter	🔒		Medium
363	max-sum-of-rectangle-no-larger-than-k			Hard
364	nested-list-weight-sum-ii	🔒		Medium
365	water-and-jug-problem			Medium
366	find-leaves-of-binary-tree	🔒		Medium
367	valid-perfect-square	Python		Easy
368	largest-divisible-subset			Medium
369	plus-one-linked-list	🔒		Medium
370	range-addition	🔒	📝	Medium
371	sum-of-two-integers	Python		Easy
372	super-pow			Medium
373	find-k-pairs-with-smallest-sums			Medium
374	guess-number-higher-or-lower	Python	📝	Easy
375	guess-number-higher-or-lower-ii		📝	Medium
376	wiggle-subsequence		📝	Medium
377	combination-sum-iv			Medium
378	kth-smallest-element-in-a-sorted-matrix			Medium
379	design-phone-directory	🔒		Medium
380	insert-delete-getrandom-o1			Medium
381	insert-delete-getrandom-o1-duplicates-allowed			Hard
382	linked-list-random-node			Medium
383	ransom-note	Python		Easy
384	shuffle-an-array		📝	Medium
385	mini-parser			Medium
386	lexicographical-numbers			Medium
387	first-unique-character-in-a-string	Python	📝	Easy
388	longest-absolute-file-path			Medium
389	find-the-difference	Python		Easy
390	elimination-game			Medium
391	perfect-rectangle			Hard
392	is-subsequence			Medium
393	utf-8-validation		📝	Medium
394	decode-string			Medium
395	longest-substring-with-at-least-k-repeating-characters			Medium
396	rotate-function			Medium
397	integer-replacement			Medium
398	random-pick-index			Medium
399	evaluate-division			Medium
400	nth-digit			Easy
401	binary-watch			Easy
402	remove-k-digits			Medium
403	frog-jump		📝	Hard
404	sum-of-left-leaves	Python		Easy
405	convert-a-number-to-hexadecimal			Easy
406	queue-reconstruction-by-height			Medium
407	trapping-rain-water-ii			Hard
408	valid-word-abbreviation	🔒		Easy
409	longest-palindrome		📝	Easy
410	split-array-largest-sum		📝	Hard
411	minimum-unique-word-abbreviation	🔒		Hard
412	fizz-buzz	Python	📝	Easy
413	arithmetic-slices		📝	Medium
414	third-maximum-number	Python		Easy
415	add-strings			Easy
416	partition-equal-subset-sum			Medium
417	pacific-atlantic-water-flow			Medium
418	sentence-screen-fitting	🔒		Medium
419	battleships-in-a-board			Medium
420	strong-password-checker			Hard
421	maximum-xor-of-two-numbers-in-an-array			Medium
422	valid-word-square	🔒		Easy
423	reconstruct-original-digits-from-english		📝	Medium
424	longest-repeating-character-replacement			Medium
425	word-squares	🔒		Hard
432	all-oone-data-structure			Hard
433	minimum-genetic-mutation			Medium
434	number-of-segments-in-a-string	Python	📝	Easy
435	non-overlapping-intervals		📝	Medium
436	find-right-interval		📝	Medium
437	path-sum-iii			Easy
438	find-all-anagrams-in-a-string			Easy
439	ternary-expression-parser	🔒		Medium
440	k-th-smallest-in-lexicographical-order			Hard
441	arranging-coins	Python		Easy
442	find-all-duplicates-in-an-array	Python		Medium
443	string-compression		📝	Easy
444	sequence-reconstruction	🔒		Medium
445	add-two-numbers-ii			Medium
446	arithmetic-slices-ii-subsequence		📝	Hard
447	number-of-boomerangs			Easy
448	find-all-numbers-disappeared-in-an-array	Python		Easy
449	serialize-and-deserialize-bst		📝	Medium
450	delete-node-in-a-bst		📝	Medium
451	sort-characters-by-frequency	Python		Medium
452	minimum-number-of-arrows-to-burst-balloons		📝	Medium
453	minimum-moves-to-equal-array-elements		📝	Easy
454	4sum-ii			Medium
455	assign-cookies			Easy
456	132-pattern		📝	Medium
457	circular-array-loop			Medium
458	poor-pigs		📝	Hard
459	repeated-substring-pattern			Easy
460	lfu-cache			Hard
461	hamming-distance	Python		Easy
462	minimum-moves-to-equal-array-elements-ii	Python	📝	Medium
463	island-perimeter	Python		Easy
464	can-i-win			Medium
465	optimal-account-balancing	🔒		Hard
466	count-the-repetitions		📝	Hard
467	unique-substrings-in-wraparound-string			Medium
468	validate-ip-address			Medium
469	convex-polygon	🔒		Medium
471	encode-string-with-shortest-length	🔒		Hard
472	concatenated-words			Hard
473	matchsticks-to-square		📝	Medium
474	ones-and-zeroes		📝	Medium
475	heaters			Easy
476	number-complement	Python		Easy
477	total-hamming-distance		📝	Medium
479	largest-palindrome-product			Hard
480	sliding-window-median		📝	Hard
481	magical-string			Medium
482	license-key-formatting			Easy
483	smallest-good-base			Hard
484	find-permutation	🔒	📝	Medium
485	max-consecutive-ones	Python		Easy
486	predict-the-winner		📝	Medium
487	max-consecutive-ones-ii	🔒		Medium
488	zuma-game			Hard
490	the-maze	🔒	📝	Medium
491	increasing-subsequences			Medium
492	construct-the-rectangle	Python		Easy
493	reverse-pairs		📝	Hard
494	target-sum		📝	Medium
495	teemo-attacking			Medium
496	next-greater-element-i	Python	📝	Easy
498	diagonal-traverse			Medium
499	the-maze-iii	🔒		Hard
500	keyboard-row	Python		Easy
501	find-mode-in-binary-search-tree			Easy
502	ipo		📝	Hard
503	next-greater-element-ii		📝	Medium
504	base-7			Easy
505	the-maze-ii	🔒	📝	Medium
506	relative-ranks			Easy
507	perfect-number		📝	Easy
508	most-frequent-subtree-sum			Medium
509	inorder-successor-in-bst-ii	🔒	📝	Medium
511	all-paths-from-source-lead-to-destination	🔒		Medium
513	find-bottom-left-tree-value			Medium
514	freedom-trail			Hard
515	find-largest-value-in-each-tree-row			Medium
516	longest-palindromic-subsequence			Medium
517	super-washing-machines		📝	Hard
518	coin-change-2			Medium
520	detect-capital	Python		Easy
521	longest-uncommon-subsequence-i	Python	📝	Easy
522	longest-uncommon-subsequence-ii		📝	Medium
523	continuous-subarray-sum		📝	Medium
524	longest-word-in-dictionary-through-deleting		📝	Medium
525	contiguous-array		📝	Medium
526	beautiful-arrangement		📝	Medium
527	word-abbreviation	🔒	📝	Hard
529	minesweeper			Medium
530	minimum-absolute-difference-in-bst			Easy
531	lonely-pixel-i	🔒		Medium
532	k-diff-pairs-in-an-array			Easy
533	lonely-pixel-ii	🔒		Medium
535	encode-and-decode-tinyurl		📝	Medium
536	construct-binary-tree-from-string	🔒		Medium
537	complex-number-multiplication		📝	Medium
538	convert-bst-to-greater-tree		📝	Easy
539	minimum-time-difference			Medium
540	single-element-in-a-sorted-array	Python		Medium
541	reverse-string-ii	Python	📝	Easy
542	01-matrix		📝	Medium
543	diameter-of-binary-tree		📝	Easy
544	output-contest-matches	🔒	📝	Medium
545	boundary-of-binary-tree	🔒	📝	Medium
546	remove-boxes		📝	Hard
547	friend-circles		📝	Medium
548	split-array-with-equal-sum	🔒	📝	Medium
549	binary-tree-longest-consecutive-sequence-ii	🔒	📝	Medium
551	student-attendance-record-i	Python	📝	Easy
552	student-attendance-record-ii		📝	Hard
553	optimal-division	Python	📝	Medium
554	brick-wall		📝	Medium
555	split-concatenated-strings	🔒	📝	Medium
556	next-greater-element-iii		📝	Medium
557	reverse-words-in-a-string-iii	Python	📝	Easy
560	subarray-sum-equals-k		📝	Medium
561	array-partition-i		📝	Easy
562	longest-line-of-consecutive-one-in-matrix	🔒	📝	Medium
563	binary-tree-tilt		📝	Easy
564	find-the-closest-palindrome		📝	Hard
565	array-nesting		📝	Medium
566	reshape-the-matrix	Python	📝	Easy
567	permutation-in-string		📝	Medium
568	maximum-vacation-days	🔒	📝	Hard
572	subtree-of-another-tree		📝	Easy
573	squirrel-simulation	🔒	📝	Medium
575	distribute-candies	Python	📝	Easy
576	out-of-boundary-paths		📝	Medium
581	shortest-unsorted-continuous-subarray		📝	Easy
582	kill-process	🔒	📝	Medium
583	delete-operation-for-two-strings		📝	Medium
587	erect-the-fence		📝	Hard
588	design-in-memory-file-system	🔒	📝	Hard
591	tag-validator		📝	Hard
592	fraction-addition-and-subtraction		📝	Medium
593	valid-square		📝	Medium
594	longest-harmonious-subsequence		📝	Easy
598	range-addition-ii	Python	📝	Easy
599	minimum-index-sum-of-two-lists	Python	📝	Easy
600	non-negative-integers-without-consecutive-ones		📝	Hard
604	design-compressed-string-iterator	🔒	📝	Easy
605	can-place-flowers		📝	Easy
606	construct-string-from-binary-tree	Python	📝	Easy
609	find-duplicate-file-in-system		📝	Medium
611	valid-triangle-number		📝	Medium
616	add-bold-tag-in-string	🔒	📝	Medium
617	merge-two-binary-trees	Python	📝	Easy
621	task-scheduler		📝	Medium
623	add-one-row-to-tree		📝	Medium
624	maximum-distance-in-arrays	🔒	📝	Easy
625	minimum-factorization	🔒	📝	Medium
628	maximum-product-of-three-numbers		📝	Easy
629	k-inverse-pairs-array		📝	Hard
630	course-schedule-iii		📝	Hard
631	design-excel-sum-formula	🔒	📝	Hard
632	smallest-range		📝	Hard
633	sum-of-square-numbers		📝	Easy
634	find-the-derangement-of-an-array	🔒	📝	Medium
635	design-log-storage-system	🔒	📝	Medium
636	exclusive-time-of-functions		📝	Medium
637	average-of-levels-in-binary-tree		📝	Easy
638	shopping-offers		📝	Medium
639	decode-ways-ii		📝	Hard
640	solve-the-equation		📝	Medium
642	design-search-autocomplete-system	🔒	📝	Hard
643	maximum-average-subarray-i		📝	Easy
644	maximum-average-subarray-ii	🔒	📝	Hard
645	set-mismatch		📝	Easy
646	maximum-length-of-pair-chain		📝	Medium
647	palindromic-substrings	Python	📝	Medium
648	replace-words		📝	Medium
649	dota2-senate		📝	Medium
650	2-keys-keyboard		📝	Medium
651	4-keys-keyboard	🔒	📝	Medium
652	find-duplicate-subtrees		📝	Medium
653	two-sum-iv-input-is-a-bst		📝	Easy
654	maximum-binary-tree		📝	Medium
655	print-binary-tree		📝	Medium
656	coin-path	🔒	📝	Hard
657	robot-return-to-origin	Python	📝	Easy
658	find-k-closest-elements		📝	Medium
659	split-array-into-consecutive-subsequences		📝	Medium
660	remove-9	🔒	📝	Hard
661	image-smoother		📝	Easy
662	maximum-width-of-binary-tree		📝	Medium
663	equal-tree-partition	🔒	📝	Medium
664	strange-printer		📝	Hard
665	non-decreasing-array		📝	Easy
666	path-sum-iv	🔒	📝	Medium
667	beautiful-arrangement-ii		📝	Medium
668	kth-smallest-number-in-multiplication-table		📝	Hard
669	trim-a-binary-search-tree	Python	📝	Easy
670	maximum-swap	Python	📝	Medium
671	second-minimum-node-in-a-binary-tree	Python	📝	Easy
672	bulb-switcher-ii		📝	Medium
673	number-of-longest-increasing-subsequence		📝	Medium
674	longest-continuous-increasing-subsequence		📝	Easy
675	cut-off-trees-for-golf-event		📝	Hard
676	implement-magic-dictionary		📝	Medium
677	map-sum-pairs	Python	📝	Medium
678	valid-parenthesis-string		📝	Medium
679	24-game		📝	Hard
680	valid-palindrome-ii		📝	Easy
681	next-closest-time	🔒	📝	Medium
682	baseball-game	Python	📝	Easy
683	k-empty-slots	🔒	📝	Hard
684	redundant-connection		📝	Medium
685	redundant-connection-ii		📝	Hard
686	repeated-string-match		📝	Easy
687	longest-univalue-path		📝	Easy
688	knight-probability-in-chessboard		📝	Medium
689	maximum-sum-of-3-non-overlapping-subarrays		📝	Hard
690	employee-importance		📝	Easy
691	stickers-to-spell-word		📝	Hard
692	top-k-frequent-words		📝	Medium
693	binary-number-with-alternating-bits	Python	📝	Easy
694	number-of-distinct-islands	🔒	📝	Medium
695	max-area-of-island		📝	Medium
696	count-binary-substrings		📝	Easy
697	degree-of-an-array		📝	Easy
698	partition-to-k-equal-sum-subsets		📝	Medium
699	falling-squares		📝	Hard
711	number-of-distinct-islands-ii	🔒	📝	Hard
712	minimum-ascii-delete-sum-for-two-strings		📝	Medium
713	subarray-product-less-than-k		📝	Medium
714	best-time-to-buy-and-sell-stock-with-transaction-fee		📝	Medium
715	range-module		📝	Hard
716	max-stack	🔒	📝	Easy
717	1-bit-and-2-bit-characters		📝	Easy
718	maximum-length-of-repeated-subarray		📝	Medium
719	find-k-th-smallest-pair-distance		📝	Hard
720	longest-word-in-dictionary		📝	Easy
721	accounts-merge		📝	Medium
722	remove-comments		📝	Medium
723	candy-crush	🔒	📝	Medium
724	find-pivot-index	Python	📝	Easy
725	split-linked-list-in-parts		📝	Medium
726	number-of-atoms		📝	Hard
727	minimum-window-subsequence	🔒	📝	Hard
728	self-dividing-numbers	Python	📝	Easy
729	my-calendar-i		📝	Medium
730	count-different-palindromic-subsequences		📝	Hard
731	my-calendar-ii		📝	Medium
732	my-calendar-iii		📝	Hard
733	flood-fill		📝	Easy
734	sentence-similarity	🔒	📝	Easy
735	asteroid-collision		📝	Medium
736	parse-lisp-expression		📝	Hard
737	sentence-similarity-ii	🔒	📝	Medium
738	monotone-increasing-digits		📝	Medium
739	daily-temperatures		📝	Medium
740	delete-and-earn		📝	Medium
741	cherry-pickup		📝	Hard
742	to-lower-case	Python		Easy
743	closest-leaf-in-a-binary-tree	🔒	📝	Medium
744	network-delay-time		📝	Medium
745	find-smallest-letter-greater-than-target	Python	📝	Easy
746	prefix-and-suffix-search		📝	Hard
747	min-cost-climbing-stairs		📝	Easy
748	largest-number-at-least-twice-of-others		📝	Easy
749	shortest-completing-word	Python	📝	Easy
750	contain-virus		📝	Hard
751	number-of-corner-rectangles	🔒	📝	Medium
752	ip-to-cidr	🔒	📝	Easy
753	open-the-lock		📝	Medium
754	cracking-the-safe		📝	Hard
755	reach-a-number		📝	Easy
756	pour-water	🔒	📝	Medium
757	pyramid-transition-matrix		📝	Medium
758	convert-binary-search-tree-to-sorted-doubly-linked-list	🔒	📝	Medium
759	set-intersection-size-at-least-two		📝	Hard
760	bold-words-in-string	🔒	📝	Easy
761	employee-free-time	🔒	📝	Hard
762	find-anagram-mappings	🔒	📝	Easy
763	special-binary-string		📝	Hard
764	n-ary-tree-level-order-traversal			Easy
765	serialize-and-deserialize-n-ary-tree	🔒		Hard
766	flatten-a-multilevel-doubly-linked-list			Medium
767	prime-number-of-set-bits-in-binary-representation		📝	Easy
768	partition-labels		📝	Medium
769	largest-plus-sign		📝	Medium
770	couples-holding-hands		📝	Hard
771	encode-n-ary-tree-to-binary-tree	🔒		Hard
772	construct-quad-tree			Medium
773	quad-tree-intersection			Easy
774	maximum-depth-of-n-ary-tree	Python	📝	Easy
775	n-ary-tree-preorder-traversal		📝	Easy
776	n-ary-tree-postorder-traversal		📝	Easy
777	toeplitz-matrix		📝	Easy
778	reorganize-string		📝	Medium
779	max-chunks-to-make-sorted-ii		📝	Hard
780	max-chunks-to-make-sorted		📝	Medium
781	basic-calculator-iv		📝	Hard
782	jewels-and-stones	Python	📝	Easy
783	search-in-a-binary-search-tree	Python		Easy
784	insert-into-a-binary-search-tree		📝	Medium
785	basic-calculator-iii	🔒		Hard
786	search-in-a-sorted-array-of-unknown-size	🔒		Medium
787	sliding-puzzle		📝	Hard
788	minimize-max-distance-to-gas-station	🔒	📝	Hard
789	kth-largest-element-in-a-stream			Easy
790	global-and-local-inversions		📝	Medium
791	split-bst	🔒	📝	Medium
792	binary-search	Python	📝	Easy
793	swap-adjacent-in-lr-string		📝	Medium
794	swim-in-rising-water		📝	Hard
795	k-th-symbol-in-grammar		📝	Medium
796	reaching-points		📝	Hard
797	rabbits-in-forest		📝	Medium
798	transform-to-chessboard		📝	Hard
799	minimum-distance-between-bst-nodes		📝	Easy
800	letter-case-permutation	Python	📝	Easy
801	is-graph-bipartite		📝	Medium
802	k-th-smallest-prime-fraction		📝	Hard
803	cheapest-flights-within-k-stops		📝	Medium
804	rotated-digits		📝	Easy
805	escape-the-ghosts		📝	Medium
806	domino-and-tromino-tiling		📝	Medium
807	custom-sort-string		📝	Medium
808	number-of-matching-subsequences		📝	Medium
809	preimage-size-of-factorial-zeroes-function		📝	Hard
810	valid-tic-tac-toe-state		📝	Medium
811	number-of-subarrays-with-bounded-maximum		📝	Medium
812	rotate-string		📝	Easy
813	all-paths-from-source-to-target		📝	Medium
814	smallest-rotation-with-highest-score		📝	Hard
815	champagne-tower		📝	Medium
816	design-hashset	Python		Easy
817	design-hashmap	Python		Easy
818	similar-rgb-color	🔒	📝	Easy
819	minimum-swaps-to-make-sequences-increasing		📝	Medium
820	find-eventual-safe-states		📝	Medium
821	bricks-falling-when-hit		📝	Hard
822	unique-morse-code-words	Python	📝	Easy
823	split-array-with-same-average		📝	Hard
824	number-of-lines-to-write-string		📝	Easy
825	max-increase-to-keep-city-skyline		📝	Medium
826	soup-servings		📝	Medium
827	expressive-words		📝	Medium
828	chalkboard-xor-game		📝	Hard
829	subdomain-visit-count	Python	📝	Easy
830	largest-triangle-area		📝	Easy
831	largest-sum-of-averages		📝	Medium
832	binary-tree-pruning		📝	Medium
833	bus-routes		📝	Hard
834	ambiguous-coordinates		📝	Medium
835	linked-list-components		📝	Medium
836	race-car		📝	Hard
837	most-common-word		📝	Easy
838	design-linked-list	Python		Easy
839	short-encoding-of-words		📝	Medium
841	shortest-distance-to-a-character		📝	Easy
842	card-flipping-game		📝	Medium
843	binary-trees-with-factors		📝	Medium
850	insert-into-a-cyclic-sorted-list	🔒		Medium
851	goat-latin		📝	Easy
852	friends-of-appropriate-ages		📝	Medium
853	most-profit-assigning-work		📝	Medium
854	making-a-large-island		📝	Hard
855	unique-letter-string		📝	Hard
856	consecutive-numbers-sum		📝	Hard
857	positions-of-large-groups	Python	📝	Easy
858	masking-personal-information		📝	Medium
859	design-circular-deque			Medium
860	design-circular-queue			Medium
861	flipping-an-image	Python	📝	Easy
862	find-and-replace-in-string		📝	Medium
863	sum-of-distances-in-tree		📝	Hard
864	image-overlap		📝	Medium
865	robot-room-cleaner	🔒	📝	Hard
866	rectangle-overlap		📝	Easy
867	new-21-game		📝	Medium
868	push-dominoes		📝	Medium
869	similar-string-groups		📝	Hard
870	magic-squares-in-grid		📝	Easy
871	keys-and-rooms		📝	Medium
872	split-array-into-fibonacci-sequence		📝	Medium
873	guess-the-word		📝	Hard
874	backspace-string-compare		📝	Easy
875	longest-mountain-in-array		📝	Medium
876	hand-of-straights		📝	Medium
877	shortest-path-visiting-all-nodes		📝	Hard
878	shifting-letters		📝	Medium
879	maximize-distance-to-closest-person		📝	Easy
880	rectangle-area-ii		📝	Hard
881	loud-and-rich		📝	Medium
882	peak-index-in-a-mountain-array	Python	📝	Easy
883	car-fleet		📝	Medium
884	k-similar-strings		📝	Hard
885	exam-room		📝	Medium
886	score-of-parentheses		📝	Medium
887	minimum-cost-to-hire-k-workers		📝	Hard
888	mirror-reflection		📝	Medium
889	buddy-strings		📝	Easy
890	lemonade-change		📝	Easy
891	score-after-flipping-matrix		📝	Medium
892	shortest-subarray-with-sum-at-least-k		📝	Hard
893	all-nodes-distance-k-in-binary-tree		📝	Medium
894	random-pick-with-blacklist		📝	Hard
895	shortest-path-to-get-all-keys		📝	Hard
896	smallest-subtree-with-all-the-deepest-nodes		📝	Medium
897	prime-palindrome		📝	Medium
898	transpose-matrix	Python	📝	Easy
899	binary-gap		📝	Easy
900	reordered-power-of-2		📝	Medium
901	advantage-shuffle		📝	Medium
902	minimum-number-of-refueling-stops		📝	Hard
903	implement-rand10-using-rand7		📝	Medium
904	leaf-similar-trees		📝	Easy
905	length-of-longest-fibonacci-subsequence		📝	Medium
906	walking-robot-simulation		📝	Easy
907	koko-eating-bananas		📝	Medium
908	middle-of-the-linked-list		📝	Easy
909	stone-game		📝	Medium
910	nth-magical-number		📝	Hard
911	profitable-schemes		📝	Hard
912	random-pick-with-weight		📝	Medium
913	random-flip-matrix		📝	Medium
914	random-point-in-non-overlapping-rectangles		📝	Medium
915	generate-random-point-in-a-circle		📝	Medium
916	decoded-string-at-index		📝	Medium
917	boats-to-save-people		📝	Medium
918	reachable-nodes-in-subdivided-graph		📝	Hard
919	projection-area-of-3d-shapes	Python	📝	Easy
920	uncommon-words-from-two-sentences		📝	Easy
921	spiral-matrix-iii		📝	Medium
922	possible-bipartition		📝	Medium
923	super-egg-drop		📝	Hard
924	fair-candy-swap		📝	Easy
925	construct-binary-tree-from-preorder-and-postorder-traversal		📝	Medium
926	find-and-replace-pattern		📝	Medium
927	sum-of-subsequence-widths		📝	Hard
928	surface-area-of-3d-shapes		📝	Easy
929	groups-of-special-equivalent-strings		📝	Easy
930	all-possible-full-binary-trees		📝	Medium
931	maximum-frequency-stack		📝	Hard
932	monotonic-array		📝	Easy
933	increasing-order-search-tree		📝	Easy
934	bitwise-ors-of-subarrays		📝	Medium
935	orderly-queue		📝	Hard
936	rle-iterator		📝	Medium
937	online-stock-span		📝	Medium
938	numbers-at-most-n-given-digit-set		📝	Hard
939	valid-permutations-for-di-sequence		📝	Hard
940	fruit-into-baskets		📝	Medium
941	sort-array-by-parity	Python	📝	Easy
942	super-palindromes		📝	Hard
943	sum-of-subarray-minimums		📝	Medium
944	smallest-range-i		📝	Easy
945	snakes-and-ladders		📝	Medium
946	smallest-range-ii		📝	Medium
947	online-election		📝	Medium
948	sort-an-array			Medium
949	cat-and-mouse		📝	Hard
950	x-of-a-kind-in-a-deck-of-cards	Python	📝	Easy
951	partition-array-into-disjoint-intervals		📝	Medium
952	word-subsets		📝	Medium
953	reverse-only-letters		📝	Easy
954	maximum-sum-circular-subarray		📝	Medium
955	complete-binary-tree-inserter		📝	Medium
956	number-of-music-playlists		📝	Hard
957	minimum-add-to-make-parentheses-valid		📝	Medium
958	sort-array-by-parity-ii	Python	📝	Easy
959	3sum-with-multiplicity		📝	Medium
960	minimize-malware-spread		📝	Hard
961	long-pressed-name		📝	Easy
962	flip-string-to-monotone-increasing		📝	Medium
963	three-equal-parts		📝	Hard
964	minimize-malware-spread-ii		📝	Hard
965	unique-email-addresses	Python	📝	Easy
966	binary-subarrays-with-sum		📝	Medium
967	minimum-falling-path-sum		📝	Medium
968	beautiful-array		📝	Medium
969	number-of-recent-calls		📝	Easy
971	shortest-bridge		📝	Medium
972	knight-dialer		📝	Medium
973	stamping-the-sequence		📝	Hard
974	reorder-log-files		📝	Easy
975	range-sum-of-bst		📝	Easy
976	minimum-area-rectangle		📝	Medium
977	distinct-subsequences-ii		📝	Hard
978	valid-mountain-array		📝	Easy
979	di-string-match		📝	Easy
980	find-the-shortest-superstring		📝	Hard
981	delete-columns-to-make-sorted	Python	📝	Easy
982	minimum-increment-to-make-array-unique		📝	Medium
983	validate-stack-sequences		📝	Medium
984	most-stones-removed-with-same-row-or-column		📝	Medium
985	bag-of-tokens		📝	Medium
986	largest-time-for-given-digits		📝	Easy
987	reveal-cards-in-increasing-order		📝	Medium
988	flip-equivalent-binary-trees		📝	Medium
989	largest-component-size-by-common-factor		📝	Hard
990	verifying-an-alien-dictionary		📝	Easy
991	array-of-doubled-pairs		📝	Medium
992	delete-columns-to-make-sorted-ii		📝	Medium
993	tallest-billboard		📝	Hard
994	prison-cells-after-n-days		📝	Medium
998	check-completeness-of-a-binary-tree		📝	Medium
999	regions-cut-by-slashes		📝	Medium
1000	delete-columns-to-make-sorted-iii		📝	Hard
1001	n-repeated-element-in-size-2n-array	Python	📝	Easy
1002	maximum-width-ramp		📝	Medium
1003	minimum-area-rectangle-ii		📝	Medium
1004	least-operators-to-express-number		📝	Hard
1005	univalued-binary-tree	Python	📝	Easy
1006	vowel-spellchecker		📝	Medium
1007	numbers-with-same-consecutive-differences		📝	Medium
1008	binary-tree-cameras		📝	Hard
1009	pancake-sorting		📝	Medium
1010	powerful-integers		📝	Easy
1011	flip-binary-tree-to-match-preorder-traversal		📝	Medium
1012	equal-rational-numbers		📝	Hard
1013	fibonacci-number	Python		Easy
1014	k-closest-points-to-origin		📝	Medium
1016	subarray-sums-divisible-by-k		📝	Medium
1017	odd-even-jump		📝	Hard
1018	largest-perimeter-triangle		📝	Easy
1019	squares-of-a-sorted-array	Python	📝	Easy
1020	longest-turbulent-subarray		📝	Medium
1021	distribute-coins-in-binary-tree		📝	Medium
1022	unique-paths-iii		📝	Hard
1023	time-based-key-value-store		📝	Medium
1024	triples-with-bitwise-and-equal-to-zero			Hard
1025	minimum-cost-for-tickets		📝	Medium
1026	string-without-aaa-or-bbb	Python	📝	Medium
1027	sum-of-even-numbers-after-queries		📝	Easy
1028	interval-list-intersections		📝	Medium
1029	vertical-order-traversal-of-a-binary-tree		📝	Medium
1030	smallest-string-starting-from-leaf		📝	Medium
1031	add-to-array-form-of-integer		📝	Easy
1032	satisfiability-of-equality-equations		📝	Medium
1033	broken-calculator		📝	Medium
1034	subarrays-with-k-different-integers		📝	Hard
1035	cousins-in-binary-tree		📝	Easy
1036	rotting-oranges		📝	Easy
1037	minimum-number-of-k-consecutive-bit-flips		📝	Hard
1038	number-of-squareful-arrays		📝	Hard
1039	find-the-town-judge			Easy
1040	maximum-binary-tree-ii			Medium
1041	available-captures-for-rook	Python		Easy
1042	minimum-cost-to-merge-stones			Hard
1043	grid-illumination			Hard
1044	find-common-characters	Python		Easy
1045	check-if-word-is-valid-after-substitutions			Medium
1046	max-consecutive-ones-iii			Medium
1047	maximize-sum-of-array-after-k-negations	Python		Easy
1048	clumsy-factorial			Medium
1049	minimum-domino-rotations-for-equal-row		📝	Medium
1050	construct-binary-search-tree-from-preorder-traversal		📝	Medium
1051	shortest-way-to-form-string	🔒		Medium
1052	campus-bikes	🔒		Medium
1053	minimize-rounding-error-to-meet-target	🔒		Medium
1054	complement-of-base-10-integer			Easy
1055	pairs-of-songs-with-total-durations-divisible-by-60			Easy
1056	capacity-to-ship-packages-within-d-days			Medium
1057	numbers-with-repeated-digits			Hard
1058	lexicographically-smallest-equivalent-string	🔒		Medium
1059	missing-element-in-sorted-array	🔒	📝	Medium
1060	longest-repeating-substring	🔒		Medium
1061	number-of-valid-subarrays	🔒		Hard
1062	partition-array-into-three-parts-with-equal-sum			Easy
1063	best-sightseeing-pair			Medium
1064	smallest-integer-divisible-by-k			Medium
1065	binary-string-with-substrings-representing-1-to-n			Medium
1066	fixed-point	🔒		Easy
1067	campus-bikes-ii	🔒		Medium
1068	digit-count-in-range	🔒		Hard
1069	confusing-number	🔒		Easy
1070	convert-to-base-2			Medium
1071	binary-prefix-divisible-by-5			Easy
1072	next-greater-node-in-linked-list			Medium
1073	number-of-enclaves			Medium
1075	index-pairs-of-a-string	🔒		Easy
1078	remove-outermost-parentheses			Easy
1079	sum-of-root-to-leaf-binary-numbers			Easy
1080	camelcase-matching			Medium
1081	video-stitching			Medium
1086	divisor-game			Easy
1087	longest-arithmetic-sequence			Medium
1092	maximum-difference-between-node-and-ancestor			Medium
1093	recover-a-tree-from-preorder-traversal			Hard
1094	matrix-cells-in-distance-order			Easy
1095	two-city-scheduling		📝	Easy
1096	maximum-sum-of-two-non-overlapping-subarrays			Medium
1097	stream-of-characters			Hard
1103	moving-stones-until-consecutive			Easy
1104	coloring-a-border			Medium
1105	uncrossed-lines			Medium
1106	escape-a-large-maze			Hard
1111	minimum-score-triangulation-of-polygon			Medium
1113	moving-stones-until-consecutive-ii			Medium
1114	binary-search-tree-to-greater-sum-tree			Medium
1115	valid-boomerang			Easy
1119	robot-bounded-in-circle			Easy
1120	flower-planting-with-no-adjacent			Easy
1121	partition-array-for-maximum-sum			Medium
1122	longest-duplicate-substring			Hard
1127	last-stone-weight			Easy
1128	remove-all-adjacent-duplicates-in-string			Easy
1129	longest-string-chain			Medium
1130	last-stone-weight-ii			Medium
1137	height-checker			Easy
1138	grumpy-bookstore-owner			Medium
1139	previous-permutation-with-one-swap			Medium
1140	distant-barcodes			Medium
1145	number-of-submatrices-that-sum-to-target			Hard
1146	greatest-common-divisor-of-strings			Easy
1147	flip-columns-for-maximum-number-of-equal-rows			Medium
1148	adding-two-negabinary-numbers			Medium
1156	occurrences-after-bigram			Easy
1157	insufficient-nodes-in-root-to-leaf-paths			Medium
1159	smallest-subsequence-of-distinct-characters			Medium
1160	letter-tile-possibilities			Medium