122. Best Time to Buy and Sell Stock II-买卖股票的最佳时机 II
Say you have an array prices for which the ith element ... » 阅读全文
119. Pascal’s Triangle II-杨辉三角 II
Given an integer rowIndex, return the rowIndex-th row o... » 阅读全文
118. Pascal’s Triangle-杨辉三角
Given a non-negative integer numRows, generate the firs... » 阅读全文
112. Path Sum-路径总和
Given a binary tree and a sum, determine if the tree ha... » 阅读全文
111. Minimum Depth of Binary Tree-二叉树的最小深度
Given a binary tree, find its minimum depth. The minimu... » 阅读全文
110. Balanced Binary Tree-平衡二叉树
Given a binary tree, determine if it is height-balanced... » 阅读全文
108. Convert Sorted Array to Binary Search Tree-将有序数组转换为二叉搜索树
Given an array where elements are sorted in ascending o... » 阅读全文
107. Binary Tree Level Order Traversal II-二叉树的层序遍历 II
Given a binary tree, return the bottom-up level order t... » 阅读全文
104. Maximum Depth of Binary Tree-二叉树的最大深度
Given the root of a binary tree, return its maximum dep... » 阅读全文