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…

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…

Title: https://leetcode.com/problems/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 numbe…

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…

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…

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…

引言 既上一篇 子集系列(一) 后,这里我们接着讨论带有附加条件的子集求解方法. 这类题目也是求子集,只不过不是返回所有的自己,而往往是要求返回满足一定要求的子集. 解这种类型的题目,其思路可以在上一篇文章的思路略作改进. 例 1,求元素数量为定值的所有子集 Combinations Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. For example,If n …

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[…

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…