LeetCode

LeetCode Problems' Solutions

Problems

#	Title	Solution	Difficulty
1	Two Sum	C++ Go Python	Easy
2	Add Two Numbers	C++ Go Python	Medium
3	Longest Substring Without Repeating Characters	C++ Go Python	Medium
4	Median of Two Sorted Arrays	C++ Go Python	Hard
5	Longest Palindromic Substring	Go Python	Medium
6	ZigZag Conversion	Go Python	Medium
7	Reverse Integer	Python	Easy
8	String to Integer (atoi)	Python	Medium
9	Palindrome Number	Python	Easy
10	Regular Expression Matching	Python	Hard
11	Container With Most Water	Python	Medium
12	Integer to Roman	Python	Medium
13	Roman to Integer	Go Python	Easy
14	Longest Common Prefix	Python	Easy
15	3Sum	Python	Medium
16	3Sum Closest	Python	Medium
17	Letter Combinations of a Phone Number	Python	Medium
18	4Sum	Python	Medium
19	Remove Nth Node From End of List	Python	Medium
20	Valid Parentheses	Python	Easy
21	Merge Two Sorted Lists	Python	Easy
22	Generate Parentheses	Python	Medium
23	Merge k Sorted Lists	Python	Hard
24	Swap Nodes in Pairs	Python	Medium
29	Divide Two Integers	Go	Medium
30	Substring with Concatenation of All Words	Go	Hard
32	Longest Valid Parentheses	Python	Hard
33	Search in Rotated Sorted Array	C++ Python	Medium
34	Find First and Last Position of Element in Sorted Array	C++ Go	Medium
39	Combination Sum	Go Python	Medium
40	Combination Sum II	Go	Medium
41	First Missing Positive	Python	Hard
42	Trapping Rain Water	Go Python	Hard
45	Jump Game II	Go Python	Hard
46	Permutations	Python	Medium
48	Rotate Image	Python	Medium
49	Group Anagrams	Go Python	Medium
51	N-Queens	Go	Hard
52	N-Queens II	Go	Hard
53	Maximum Subarray	Go Python	Easy
54	Spiral Matrix	Go	Medium
55	Jump Game	Go Python	Medium
56	Merge Intervals	Python	Medium
59	Spiral Matrix II	Go	Medium
62	Unique Paths	Go Python	Medium
63	Unique Paths II	Go	Medium
64	Minimum Path Sum	Go Python	Medium
70	Climbing Stairs	Go Python	Easy
72	Edit Distance	Go Python	Hard
75	Sort Colors	Go Python	Medium
78	Subsets	Go Python	Medium
79	Word Search	Python	Medium
84	Largest Rectangle in Histogram	Python	Hard
85	Maximal Rectangle	Python	Hard
86	Partition List	Go	Medium
88	Merge Sorted Array	Go	Easy
91	Decode Ways	Go	Medium
92	Reverse Linked List II	Go	Medium
94	Binary Tree Inorder Traversal	Python	Medium
95	Unique Binary Search Trees II	Go	Medium
96	Unique Binary Search Trees	Go Python	Medium
97	Interleaving String	Go	Medium
98	Validate Binary Search Tree	Go Python	Medium
101	Symmetric Tree	Python	Easy
102	Binary Tree Level Order Traversal	Go Python	Medium
104	Maximum Depth of Binary Tree	Go Python	Easy
105	Construct Binary Tree from Preorder and Inorder Traversal	Go Python	Medium
108	Convert Sorted Array to Binary Search Tree	Go	Easy
114	Flatten Binary Tree to Linked List	Go Python	Medium
118	Pascal's Triangle	Go	Easy
119	Pascal's Triangle II	Go	Easy
120	Triangle	Go	Medium
121	Best Time to Buy and Sell Stock	Go Python	Easy
122	Best Time to Buy and Sell Stock II	Go	Medium
126	Word Ladder II	Go	Hard
128	Longest Consecutive Sequence	Go	Medium
135	Candy	Go	Hard
137	Single Number II	Go	Medium
139	Word Break	Go	Medium
152	Maximum Product Subarray	Go	Medium
160	Intersection of Two Linked Lists	Go	Easy
165	Compare Version Numbers	Go	Medium
167	Two Sum II - Input Array Is Sorted	Go	Medium
191	Number of 1 Bits	C++ Go	Easy
198	House Robber	Go	Medium
199	Binary Tree Right Side View	Go	Medium
200	Number of Islands	Go	Medium
202	Happy Number	Go	Easy
206	Reverse Linked List	Go	Easy
207	Course Schedule	Go	Medium
210	Course Schedule II	Go	Medium
213	House Robber II	Go	Medium
215	Kth Largest Element in an Array	C++ Go	Medium
216	Combination Sum III	Go	Medium
217	Contains Duplicate	Go	Easy
221	Maximal Square	Go	Medium
232	Implement Queue using Stacks	Go	Easy
235	Lowest Common Ancestor of a Binary Search Tree	Go	Easy
236	Lowest Common Ancestor of a Binary Tree	Go	Medium
237	Delete Node in a Linked List	Go	Medium
240	Search a 2D Matrix II	Go	Medium
242	Valid Anagram	Go	Easy
263	Ugly Number	Go	Easy
264	Ugly Number	Go	Easy
268	Missing Number	Go	Easy
273	Integer to English Words	Go	Hard
279	Perfect Squares	Go	Medium
283	Move Zeroes	Go	Easy
300	Longest Increasing Subsequence	Go	Medium
303	Range Sum Query - Immutable	Go	Easy
304	Range Sum Query 2D - Immutable	Go	Medium
307	Range Sum Query - Immutable	Go	Easy
309	Best Time to Buy and Sell Stock with Cooldown	Go	Medium
315	Count of Smaller Numbers After Self	Go	Hard
318	Maximum Product of Word Lengths	Go	Easy
322	Coin Change	Go	Medium
326	Power of Three	Go	Easy
330	Patching Array	Go	Hard
343	Integer Break	Go	Medium
376	Wiggle Subsequence	Go	Medium
377	Combination Sum IV	Go	Medium
378	Kth Smallest Element in a Sorted Matrix	Go	Medium
380	Insert Delete GetRandom O(1)	Go	Medium
383	Ransom Note	Go	Easy
387	Roman to Integer	Go	Easy
389	Find the Difference	Go	Easy
392	Is Subsequence	Go	Easy
404	Sum of Left Leaves	Go	Easy
406	Queue Reconstruction by Height	Go	Medium
413	Arithmetic Slices	Go	Medium
458	Poor Pigs	Go	Hard
462	Minimum Moves to Equal Array Elements II	Go	Medium
473	Matchsticks to Square	Go	Medium
496	Next Greater Element I	Go	Easy
506	Relative Ranks	Go	Easy
509	Fibonacci Number	Go	Easy
516	Longest Palindromic Subsequence	Go	Medium
518	Coin Change 2	Go	Medium
566	Reshape the Matrix	Go	Easy
576	Out of Boundary Paths	Go	Medium
583	Delete Operation for Two Strings	Go	Medium
589	N-ary Tree Preorder Traversal	Go	Easy
629	K Inverse Pairs Array	Go	Hard
630	Course Schedule III	Go	Hard
633	Sum of Square Numbers	Go	Medium
665	Non-decreasing Array	Go	Medium
695	Max Area of Island	Go	Medium
709	To Lower Case	Go	Easy
714	Best Time to Buy and Sell Stock with Transaction Fee	Go	Medium
729	My Calendar I	Go	Medium
740	Delete and Earn	Go	Medium
745	Prefix and Suffix Search	Go	Hard
746	Min Cost Climbing Stairs	Go	Easy
792	Number of Matching Subsequences	Go	Medium
804	Unique Morse Code Words	Go	Easy
820	Short Encoding of Words	Go	Medium
823	Binary Trees With Factors	Go	Medium
834	Sum of Distances in Tree	Go	Hard
858	Mirror Reflection	Go	Medium
867	Transpose Matrix	Go Python	Easy
876	Middle of the Linked List	Go	Easy
881	Boats to Save People	Go	Medium
884	Uncommon Words from Two Sentences	Go	Easy
885	Spiral Matrix III	Go	Medium
890	Find and Replace Pattern	Go	Medium
916	Word Subsets	Go	Medium
918	Maximum Sum Circular Subarray	Go	Medium
931	Minimum Falling Path Sum	Go	Medium
945	Minimum Increment to Make Array Unique	Go	Medium
953	Verifying an Alien Dictionary	Go	Easy
959	Regions Cut By Slashes	Go	Medium
968	Binary Tree Cameras	Go	Hard
976	Largest Perimeter Triangle	Go	Easy
1014	Best Sightseeing Pair	Go	Medium
1026	Determine if String Halves Are Alike	Go	Medium
1048	Longest String Chain	Go	Medium
1074	Number of Submatrices That Sum to Target	Go	Hard
1122	Relative Sort Array	Go	Easy
1137	N-th Tribonacci Number	Go	Easy
1143	Longest Common Subsequence	Go	Medium
1207	Unique Number of Occurrences	Go	Easy
1220	Count Vowels Permutation	Go	Hard
1232	Check If It Is a Straight Line	Go	Easy
1255	Maximum Score Words Formed by Letters	Go	Hard
1268	Search Suggestions System	Go	Medium
1281	Subtract the Product and Sum of Digits of an Integer	Go	Easy
1289	Minimum Falling Path Sum II	Go	Hard
1290	Convert Binary Number in a Linked List to Integer	Go	Easy
1309	Decrypt String from Alphabet to Integer Mapping	Go	Easy
1314	Matrix Block Sum	Go	Medium
1332	Remove Palindromic Subsequences	Go	Easy
1338	Reduce Array Size to The Half	Go	Medium
1342	Number of Steps to Reduce a Number to Zero	C++ Go	Easy
1347	Minimum Number of Steps to Make Two Strings Anagram	Go	Medium
1354	Construct Target Array With Multiple Sums	Go	Hard
1356	Sort Integers by The Number of 1 Bits	Go	Easy
1423	Maximum Points You Can Obtain from Cards	Go	Medium
1438	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Go	Medium
1460	Make Two Arrays Equal by Reversing Subarrays	Go	Easy
1461	Check If a String Contains All Binary Codes of Size K	Go	Medium
1465	Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts	Go	Medium
1473	Paint House III	Go	Hard
1480	Running Sum of 1d Array	Go	Easy
1491	Average Salary Excluding the Minimum and Maximum Salary	Go	Easy
1502	Can Make Arithmetic Progression From Sequence	Go	Easy
1508	Range Sum of Sorted Subarray Sums	Go	Medium
1509	Minimum Difference Between Largest and Smallest Value in Three Moves	Go	Medium
1523	Count Odd Numbers in an Interval Range	Go	Easy
1567	Maximum Length of Subarray With Positive Product	Go	Medium
1572	Matrix Diagonal Sum	Go	Easy
1588	Sum of All Odd Length Subarrays	Go	Easy
1603	Design Parking System	Go	Easy
1642	Furthest Building You Can Reach	Go	Medium
1647	Minimum Deletions to Make Character Frequencies Unique	Go	Medium
1653	Minimum Deletions to Make String Balanced	Go	Medium
1657	Determine if Two Strings Are Close	Go	Medium
1658	Minimum Operations to Reduce X to Zero	Go	Medium
1672	Richest Customer Wealth	Go	Easy
1678	Goal Parser Interpretation	Go	Easy
1689	Partitioning Into Minimum Number Of Deci-Binary Numbers	Go	Medium
1695	Maximum Erasure Value	Go	Medium
1696	Jump Game VI	Go	Medium
1704	Determine if String Halves Are Alike	Go	Easy
1710	Maximum Units on a Truck	Go	Easy
1768	Merge Strings Alternately	Go	Easy
1779	Find Nearest Point That Has the Same X or Y Coordinate	Go	Easy
1790	Check if One String Swap Can Make Strings Equal	Go	Easy
1822	Sign of the Product of an Array	Go	Easy
1863	Sum of All Subset XOR Totals	Go	Easy
1915	Number of Wonderful Substrings	Go	Medium
2000	Reverse Prefix of Word	Go	Easy
2037	Minimum Number of Moves to Seat Everyone	Go	Easy
2125	Number of Laser Beams in a Bank	Go	Medium
2134	Minimum Swaps to Group All 1's Together II	Go	Medium
2181	Merge Nodes in Between Zeros	Go	Medium
2225	Find Players With Zero or One Losses	Go	Medium
2319	Check if Matrix Is X-Matrix	Go	Easy
2320	Count Number of Ways to Place Houses	Go	Medium
2321	Maximum Score Of Spliced Array	Go	Hard
2326	Spiral Matrix IV	Go	Medium
2331	Evaluate Boolean Binary Tree	Go	Easy
2441	Largest Positive Integer That Exists With Its Negative	Go	Easy
2487	Remove Nodes From Linked List	Go	Medium
2597	The Number of Beautiful Subsets	Go	Medium
2816	Double a Number Represented as a Linked List	Go	Medium
2870	Minimum Number of Operations to Make Array Empty	Go	Medium
2997	Minimum Number of Operations to Make Array XOR Equal to K	Go	Medium
3016	Minimum Number of Pushes to Type Word II	Go	Medium
3075	Maximize Happiness of Selected Children	Go	Medium