HDU 5090 Game with Pearls(二分匹配)
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题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5090
Problem Description
Tom and Jerry are playing a game with tubes and pearls. The rule of the game is:
1) Tom and Jerry come up together with a number K.
2) Tom provides N tubes. Within each tube, there are several pearls. The number of pearls in each tube is at least 1 and at most N.
3) Jerry puts some more pearls into each tube. The number of pearls put into each tube has to be either 0 or a positive multiple of K. After that Jerry organizes these tubes in the order that the first tube has exact one pearl, the 2nd tube has exact 2 pearls, …, the Nth tube has exact N pearls.
4) If Jerry succeeds, he wins the game, otherwise Tom wins.
Write a program to determine who wins the game according to a given N, K and initial number of pearls in each tube. If Tom wins the game, output “Tom”, otherwise, output “Jerry”.
1) Tom and Jerry come up together with a number K.
2) Tom provides N tubes. Within each tube, there are several pearls. The number of pearls in each tube is at least 1 and at most N.
3) Jerry puts some more pearls into each tube. The number of pearls put into each tube has to be either 0 or a positive multiple of K. After that Jerry organizes these tubes in the order that the first tube has exact one pearl, the 2nd tube has exact 2 pearls, …, the Nth tube has exact N pearls.
4) If Jerry succeeds, he wins the game, otherwise Tom wins.
Write a program to determine who wins the game according to a given N, K and initial number of pearls in each tube. If Tom wins the game, output “Tom”, otherwise, output “Jerry”.
Input
The first line contains an integer M (M<=500), then M games follow. For each game, the first line contains 2 integers, N and K (1 <= N <= 100, 1 <= K <= N), and the second line contains N integers presenting the number of pearls in each tube.
Output
For each game, output a line containing either “Tom” or “Jerry”.
Sample Input
2 5 1 1 2 3 4 5 6 2 1 2 3 4 5 5
Sample Output
Jerry Tom
Source
2014上海全国邀请赛——题目重现(感谢上海大学提供题目)
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题意:
有 n 个容器,每个里面有一些珍珠。
可以在任意容器中添加 k 的倍数个珍珠。
问最终是否能使得每个容器分别有1 ~ n颗珍珠。
代码如下:
#include<cstdio>#include<cstring>#include<algorithm>#include<iostream>using namespace std;#define MAXN 177int N;int g[MAXN][MAXN], linker[MAXN];bool used[MAXN];int dfs(int L)//从左边开始找增广路径{ int R; for(R = 1 ; R <= N ; R++)//这个顶点编号从0开始,若要从1开始需要修改 { if(g[L][R]!=0 && !used[R]) { //找增广路,反向 used[R]=true; if(linker[R] == -1 || dfs(linker[R])) { linker[R]=L; return 1; } } } return 0;//这个不要忘了,经常忘记这句}int hungary(){ int res = 0 ; memset(linker,-1,sizeof(linker)); for(int L = 1; L <= N; L++) { memset(used,0,sizeof(used)); if(dfs(L)) res++; } return res;}int main(){ int t; int k, res, tt; scanf("%d",&t); while(t--) { scanf("%d%d",&N,&k); memset(g,0,sizeof(g)); for(int i = 1 ; i <= N ; i++ ) { scanf("%d",&tt); while(tt <= N) { g[tt][i] = 1; tt+=k; } } res = hungary(); if(res == N) { printf("Jerry\n"); } else { printf("Tom\n"); } } return 0 ;}
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