Two Sum I Given an array of integers, find two numbers such that they add up to a specific target number. The function twoSum should return indices of the two numbers such that they add up to the target, where index1 must be less than index2. You may…

II 简单dfs vector<vector<int>> combinationSum2(vector<int>& candidates, int target) { vector<vector<int>> ans; vector<int> cur; sort(candidates.begin(), candidates.end()); // 排序后去重 dfs(,target,candidates,cur,ans); ret…

I 假设有一个数组,它的第i个元素是一支给定的股票在第i天的价格.如果你最多只允许完成一次交易(例如,一次买卖股票),设计一个算法来找出最大利润. II 假设有一个数组,它的第i个元素是一个给定的股票在第i天的价格.设计一个算法来找到最大的利润.你可以完成尽可能多的交易(多次买卖股票).然而,你不能同时参与多个交易(你必须在再次购买前出售股票). III 假设你有一个数组,它的第i个元素是一支给定的股票在第i天的价格.设计一个算法来找到最大的利润.你最多可以完成两笔交易. 样例 给出一个样例数组…

1. Given an array of integers, return indices of the two numbers such that they add up to a specific target. 问题: 1.数组是否有序 2. 数组排序 // sorting array Arrays.sort(iArr) 方法1:O(n^2) public class Solution { public int[] twoSum(int[] nums, int target) { int[…

Combination Sum Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. The same repeated number may be chosen from C unlimited number of times. Note: All numbers (includi…

Path Sum I Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum. Note: A leaf is a node with no children. Example: Given the below binary tree and sum = 22…

本文包含leetcode上的Two Sum(Python实现).Two Sum II - Input array is sorted(Python实现).Two Sum IV - Input is a BST(Java实现)三个类似的题目,现总结于此. Two Sum Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may a…

一.Best Time to Buy and Sell Stock I Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to complete at most one transaction (ie, buy one and sell one share of the stock), design an algori…

3081 意甲冠军: n女生选择不吵架,他甚至男孩边(他的朋友也算.并为您收集过程).2二分图,一些副作用,有几个追求完美搭配(每场比赛没有重复的每一个点的比赛) 后.每次增广一单位,(一次完美匹配),再改动起点还有终点的边流量,继续增广.直到达不到完美匹配为止.网上非常多是用二分做的,我认为不是必需. .. (网上传播跟风真严重.. . 非常多人都不是真正懂最大流算法的... ) 3277 : 再附加一条件,每一个女孩能够最多与k个自己不喜欢的男孩. 求有几种完美匹配(同上). 我认为:求出上…

Best Time to Buy and Sell Stock I 题目链接 题目要求: Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to complete at most one transaction (ie, buy one and sell one share of the stock), design…