1. 题目 Given a sorted array and a target value, return the index if the target is found. If not, return the ind…

22. Generate Parentheses 题目 Given n pairs of parentheses, write a function to generate all combinations of wel…

题目： Given a binary tree, find the maximum path sum. The path may start and end at any node in the tree. For ex…

题目 将两个排序链表合并为一个新的排序链表 样例 给出 1->3->8->11->15->null，2->null， 返回 1->2->3->8->11->…

6. ZigZag Conversion 题目 The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows l…

  Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the followin…

  Given two sparse matrices A and B, return the result of AB. You may assume that A‘s column number…

1. 题目 Given two numbers represented as strings, return multiplication of the numbers as a string. Note:The num…

  Given a binary tree, determine if it is height-balanced. For this problem, a height-balanced binary tre…

  Given the root of a tree, you are asked to find the most frequent subtree sum. The subtree sum of a nod…

  Given a 01 matrix M, find the longest line of consecutive one in the matrix. The line could be hor…

题目： Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cas…