多路归并 #include<cstdio> #include<cstdlib> #include<algorithm> #include<cstring> #include<queue> #define MAXN 755 using namespace std; int n; int ans[MAXN]; int a[MAXN]; struct Node{ int Val,y; Node(,){ Val=p1,y=p2; } friend boo…

给出K*K的矩阵,每一行取一个数,构成K个数的和,总共有 k^k种可能,从中取出前k个最小的. 一开始犯了错,因为只要对每行排序,最小的必定是第一列的和,然后我当时就想着,逐步推进,每次将某行的那个数变成其下一列那个数,当然间距要最小.我这样明显是不对的,这样的话每个数只用了一次,而题目的意思明显是可以重复多次. 然后大白上说的是把他看成两行,即每次处理两行,留下最小的k个 再与下一次读入的那一行继续处理.这个方法相当给力,不过有个难点是,怎么在两行的时候,比较快的得到前k小的,我试过全部算一遍…

UVa11997 K Smallest Sums  题目: K Smallest Sums You're given k arrays, each array has k integers. There are kk ways to pick exactly one element in each array and calculate the sum of the integers. Your task is to find the k smallest sums among them. In…

UVA - 11997 id=18702" target="_blank" style="color:blue; text-decoration:none">K Smallest Sums Time Limit: 1000MS   Memory Limit: Unknown   64bit IO Format: %lld & %llu Submit Status You're given k arrays, each array has k…

11997 - K Smallest Sums You’re given k arrays, each array has k integers. There are kk ways to pick exactly one element in eacharray and calculate the sum of the integers. Your task is to find the k smallest sums among them.InputThere will be several…

UVA - 11997 K Smallest Sums Time Limit: 1000MS   Memory Limit: Unknown   64bit IO Format: %lld & %llu [Submit]   [Go Back]   [Status] Description   Problem K K Smallest Sums You're given k arrays, each array has k integers. There are kk ways to pick…

Problem K K Smallest Sums You're given k arrays, each array has k integers. There are kk ways to pick exactly one element in each array and calculate the sum of the integers. Your task is to find the k smallest sums among them. Input There will be se…

vjudge 上题目链接:UVA 11997 题意很简单,就是从 k 个数组(每个数组均包含 k 个正整数)中各取出一个整数相加(所以可以得到 kk 个结果),输出前 k 小的和. 这时训练指南上的一道题,这道题的简化版其实在 15 年的广东省省赛出现过,当时是以送分题的形式出现的,可我还是没能做出来,归根到底还是看书不够,接触的题型不够多. ******************************************************大白书上的讲解开始**************…

来自<训练指南>优先级队列的例题. 题目链接:http://acm.hust.edu.cn/vjudge/problem/viewProblem.action?id=18702 题意:给定k个整数数组,各包含k个元素.在每个数组中取一个元素加起来,可以得到kk个和,求这些和中最小的k个值(不去重). 数据范围:k [2, 750] 思路:暴力枚举k^k不可取. “先来看问题的简化版:给出两个长度为k的数组A和B,分别在A和B中任取一个数并相加,可以得到k^2个和,求这些和中最小的k个.” 首先…

题意:K个数组每组K个值,每次从一组中选一个,共K^k种,问前K个小的. 思路:优先队列处理多路归并,每个状态含有K个元素.详见刘汝佳算法指南. #include<iostream> #include<cstdio> #include<cstdlib> #include<stack> #include<queue> #include<vector> #include<map> #include<algorithm&g…