Problem: Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero. Note: Elements in a triplet (a,b,c) must be in non-descending order. (ie, a ≤ b ≤ c)…

题目难度:Medium 题目: Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero. Note: The solution set must not contain duplicate triplets. 翻译: 给定一个n个整数的数组S,S…

题目难度:Medium 题目: Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero. Note: The solution set must not contain duplicate triplets. 翻译: 给定一个n个整数的数组S,S…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 15: 3Sumhttps://oj.leetcode.com/problems/3sum/ Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0?Find all unique triplets in the array which gives the…

以下是这段时间抽时间刷的前5题,都是自己想的解法,或许不是最优解,只是整理下,方便日后优化提升 1. Two Sum: class Solution: # @return a tuple, (index1, index2) def twoSum(self, num, target): dict = {} for i in xrange(len(num)): if dict.get(target-num[i], None) == None: dict[num[i]] = i else: retur…

Problem:Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exactly one solution. For example, given array S…

之前写过一篇,这是第二篇.上一篇用了多种编程语言来做,这一次是以学算法为主,所以打算都用python来完成. 4. Median of Two Sorted Arrays There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log…

给定一个包含 n 个整数的数组 nums,判断 nums 中是否存在三个元素 a,b,c ,使得 a + b + c = 0 ?找出所有满足条件且不重复的三元组. 注意:答案中不可以包含重复的三元组. 例如, 给定数组 nums = [-1, 0, 1, 2, -1, -4], 满足要求的三元组集合为: [ [-1, 0, 1], [-1, -1, 2] ] 代码如下: class Solution(object): def threeSum(self, nums): """…

题目 Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero. Note: Elements in a triplet (a,b,c) must be in non-descending order. (ie, a ≤ b ≤ c) The so…

题目如下: Python代码: def threeSum(self, nums): res = [] nums.sort() for i in xrange(len(nums)-2): if i > 0 and nums[i] == nums[i-1]: continue l, r = i+1, len(nums)-1 while l < r: s = nums[i] + nums[l] + nums[r] if s < 0: l +=1 elif s > 0: r -= 1 el…