http://poj.org/problem?id=2549 题目大意:从集合中找到四个不相同的数,满足a+b+c=d,输出最大的d. —————————————————————————— 该式子变为a+b=d-c,于是我们可以通过枚举d-c,查找是否有a+b满足的值. #include<cstdio> #include<cstring> #include<map> #include<iostream> #include<cmath> #incl…

Sumsets Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 11886   Accepted: 3273 Description Given S, a set of integers, find the largest d such that a + b + c = d where a, b, c, and d are distinct elements of S. Input Several S, each cons…

poj2549 Sumsets 题目链接: http://poj.org/problem?id=2549 题意:给你一个含有n(n<=1000)个数的数列,问这个数列中是否存在四个不同的数a,b,c,d,使a+b+c=d;若存在则输出最大的d 思路:完全暴力的话O(n^4),会T,可以考虑双向搜索,公式变形为a+b=d-c:分别枚举a+b和c-d,将值和下标存在结构体中,再二分查找即可 #include<cstdio> #include<iostream> #include&…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2709 Problem Description Farmer John commanded his cows to search for different sets of numbers that sum to a given number. The cows use only numbers that are an integer power of 2. Here are the possible…

1677: [Usaco2005 Jan]Sumsets 求和 Time Limit: 5 Sec  Memory Limit: 64 MBSubmit: 570  Solved: 310[Submit][Status] Description Farmer John commanded his cows to search for different sets of numbers that sum to a given number. The cows use only numbers th…

Sumsets Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 9997   Accepted: 2736 Description Given S, a set of integers, find the largest d such that a + b + c = d where a, b, c, and d are distinct elements of S. Input Several S, each consi…

Sumsets Time Limit: 2000MS   Memory Limit: 200000K Total Submissions: 15045   Accepted: 5997 Description Farmer John commanded his cows to search for different sets of numbers that sum to a given number. The cows use only numbers that are an integer…

题目 1677: [Usaco2005 Jan]Sumsets 求和 Time Limit: 5 Sec  Memory Limit: 64 MBSubmit: 617  Solved: 344[Submit][Status] Description Farmer John commanded his cows to search for different sets of numbers that sum to a given number. The cows use only numbers…

1677: [Usaco2005 Jan]Sumsets 求和 Time Limit: 5 Sec  Memory Limit: 64 MBSubmit: 626  Solved: 348[Submit][Status] Description Farmer John commanded his cows to search for different sets of numbers that sum to a given number. The cows use only numbers th…

Sumsets Time Limit: 2000MS Memory Limit: 200000K Total Submissions: 14964 Accepted: 5978 Description Farmer John commanded his cows to search for different sets of numbers that sum to a given number. The cows use only numbers that are an integer powe…