题目： Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest p…

题目： Given an array of non-negative integers, you are initially positioned at the first index of the array. Eac…

For a non-negative integer X, the array-form of X is an array of its digits in left to right order. For exampl…

There are N students in a class. Some of them are friends, while some are not. Their friendship is transitive …

原题：https://leetcode.com/problems/baseball-game/description/ 大意：这道题初一看没看懂意思，其实很简单 Integer (one round’s sc…

1. 题目 Write a function to find the longest common prefix string amongst an array of strings. 2. 思路 遍历按序逐个比较，直接…

Given two binary strings, return their sum (also a binary string). For example, a = “11” b = ̶…

FB面经题，地里虽然很多人都提到了，但写清楚了的没几个。说明什么问题呢？就算题目都是tag题，都是高频面经题，能完美写出来问题都能答上的永远也都是少数人。不仅努力在刷，而且认真分析了思路，认真分析了时空复杂度了吗？ 用L…

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

  Write a function to delete a node (except the tail) in a singly linked list, given only access to that …

  Given a non-negative integer num represented as a string, remove k digits from the …

  Given two sentences words1, words2 (each represented as an array of strings), and a list of s…