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1464. Maximum Product of Two Elements in an Array

2966. Divide Array Into Arrays With Max Difference

matrix

1582. Special Positions in a Binary Matrix

2482. Difference Between Ones and Zeros in Row and Column

hash table

242. Valid Anagram

1657. Determine if Two Strings Are Close

string

13. Roman to Integer

1758. Minimum Changes To Make Alternating Binary String

greedy

2870. Minimum Number of Operations to Make Array Empty

dynamic programming

70. Climbing Stairs

300. Longest Increasing Subsequence

tree

543. Diameter of Binary Tree

1026. Maximum Difference Between Node and Ancestor

bit manipulation

201. Bitwise AND of Numbers Range

1457. Pseudo-Palindromic Paths in a Binary Tree

Monotonic Stack

739. Daily Temperatures

counting

169. Majority Element

two pointers

2149. Rearrange Array Elements by Sign