K - 4 Values whose Sum is 0 Crawling in process... Crawling failed Time Limit:9000MS     Memory Limit:0KB     64bit IO Format:%lld & %llu Submit Status Practice UVA 1152 Appoint description: System Crawler (2015-03-12) Description   The SUM problem c…

题意: 有N个学生.有M题目 然后相应N行分别有一个二进制和一个整数 二进制代表该同学给出的每道题的答案.整数代表该同学的答案与标准答案相符的个数 要求推断标准答案有几个,假设标准答案仅仅有一种.则输出标准答案 思路: 非常easy想到状态压缩.可是非常明显1<<30纯粹的状压是会超时的,那么我们能够优化一半,变成1<<15 也就是说,对于一个串,我们分半处理 首先处理前一半,讨论前一半与标准答案相符的状况.然后再讨论后半串,看与标准答案相符的情况能不能与前一半相匹配,从而算出答案…

题目链接: https://cn.vjudge.net/problem/UVA-1152 题目大意: 给出4个数组,每个数组有n个数,问有多少种方案在每个数组中选一个数,使得四个数相加为0. n <= 4000 解题思路: 两重循环求出a + b的所有情况 两重循环求出-c - d的所有情况 枚举a+b的值,在-c-d里面找相同值的数目即可. #include<cstdio> #include<cstring> #include<iostream> #includ…

4 Values whose Sum is 0 题目链接:https://cn.vjudge.net/problem/UVA-1152 ——每天在线,欢迎留言谈论. 题目大意: 给定4个n(1<=n<=4000)元素的集合 A.B.C.D ,从4个集合中分别选取一个元素a, b,c,d.求满足 a+b+c+d=0的对数. 思路: 直接分别枚举 a,b,c,d ,坑定炸了.我们先枚举 a+b并储存,在B.C中枚举找出(-c-d)后进行比较即可. 亮点: 由于a+b,中会有值相等的不同组合,如果使…

用中途相遇法的思想来解题.分别枚举两边,和直接暴力枚举四个数组比可以降低时间复杂度. 这里用到一个很实用的技巧: 求长度为n的有序数组a中的数k的个数num? num=upper_bound(a,a+n,k)-lower_bound(a,a+n,k); #include<iostream> #include<cstdio> #include<cstdlib> #include<cstring> #include<cmath> #include&l…

4 Values whose Sum is 0 Time Limit: 15000MS   Memory Limit: 228000K Total Submissions: 25615   Accepted: 7697 Case Time Limit: 5000MS Description The SUM problem can be formulated as follows: given four lists A, B, C, D of integer values, compute how…

4 Values whose Sum is 0 Time Limit: 15000MS Memory Limit: 228000K Total Submissions: 26974 Accepted: 8133 Case Time Limit: 5000MS Description The SUM problem can be formulated as follows: given four lists A, B, C, D of integer values, compute how man…

4 Values whose Sum is 0 Time Limit: 15000MS   Memory Limit: 228000K Total Submissions: 21370   Accepted: 6428 Case Time Limit: 5000MS Description The SUM problem can be formulated as follows: given four lists A, B, C, D of integer values, compute how…

传送门 4 Values whose Sum is 0 Time Limit: 15000MS   Memory Limit: 228000K Total Submissions: 20334   Accepted: 6100 Case Time Limit: 5000MS Description The SUM problem can be formulated as follows: given four lists A, B, C, D of integer values, compute…

4 Values whose Sum is 0 Time Limit: 15000MS   Memory Limit: 228000K Total Submissions: 13069   Accepted: 3669 Case Time Limit: 5000MS Description The SUM problem can be formulated as follows: given four lists A, B, C, D of integer values, compute how…