摘要： 1. devote 和 contribute https://zhidao.baidu.com/question/328034454447561365.html contribute to 和devote to区别1、devote to：专心致力于，把…专用于，另外还有听任的意思。2、contrib 阅读全文

摘要： Remove the minimum number of invalid parentheses in order to make the input string valid. Return all possible results. Note: The input string may cont 阅读全文

摘要： 1. 关于集合 (1) 关于map 遍历map：https://www.cnblogs.com/imzhj/p/5981665.html 感觉最好记的方法是这个： 关于get方法的一个注意点： (2) set集合的增删改元素方法和List集合是一样的吗？remove方法的一个疑问 一样的，都是 ad 阅读全文

摘要： N couples sit in 2N seats arranged in a row and want to hold hands. We want to know the minimum number of swaps so that every couple is sitting side b 阅读全文

摘要： https://leetcode.com/problems/cherry-pickup/description/ In a N x N grid representing a field of cherries, each cell is one of three possible integers 阅读全文

摘要： Given n balloons, indexed from 0 to n-1. Each balloon is painted with a number on it represented by array nums. You are asked to burst all the balloon 阅读全文

摘要： You have 4 cards each containing a number from 1 to 9. You need to judge whether they could operated through *, /, +, -, (, ) to get the value of 24. 阅读全文

摘要： Return the length of the shortest, non-empty, contiguous subarray of A with sum at least K. If there is no non-empty subarray with sum at least K, ret 阅读全文

摘要： https://leetcode.com/problems/race-car/description/ Your car starts at position 0 and speed +1 on an infinite number line. (Your car can go into negat 阅读全文

摘要： Best Time to Buy and Sell Stock Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find th 阅读全文