Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the histogram.

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Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level).

Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST.For this problem, a height-balanced binary tree is...

Given an array where elements are sorted in ascending order, convert it to a height balanced BST.For this problem, a height-balanced binary tree is defined as ...

题目描述：Given a positive integer, output its complement number. The complement strategy is to flip the bits of its binary representation.Note:The given integer ...

题目描述：Given two integers L and R, find the count of numbers in the range [L, R] (inclusive) having a prime number of set bits in their binary representation.(R...

题目描述：Given a binary matrix A, we want to flip the image horizontally, then invert it, and return the resulting image.To flip an image horizontally means that ...

/** * Definition for a binary tree node. * function TreeNode(val) { * this.val = val; * this.left = this.right = null; * } *//** * @param {TreeN...

Given an integer n, generate all structurally unique BST's (binary search trees) that store values 1...n. For example, Given n = 3, your program should retur...