LightOJ 1149 - Factors and Multiples【二分图最大匹配】

[code]#include <iostream>  
#include <algorithm>  
#include <set>  
#include <map>  
#include <string.h>  
#include <queue>  
#include <sstream>  
#include <stdio.h>  
#include <math.h>  
#include <stdlib.h>  

using namespace std;

int n, m;
int p[1000][1000];
int book[1000];
int match[1000];

int dfs(int u)
{
    int i;
    for (i = 1;i <= m;i++)
    {
        if (book[i] == 0 && p[u][i] == 1)
        {
            book[i] = 1;
            if (match[i] == 0 || dfs(match[i]))
            {
                match[i] = u;
                return 1;
            }
        }
    }
    return 0;
}

int a[110], b[110];

int main()
{
    int t;
    int cases = 1;
    scanf("%d", &t);
    while (t--)
    {
        scanf("%d",&n);
        for (int i = 1;i <= n;i++) scanf("%d", &a[i]);

        scanf("%d", &m);
        for (int i = 1;i <= m;i++) scanf("%d", &b[i]);

        int ans = 0;
        memset(match, 0, sizeof(match));
        memset(p, 0, sizeof(p));

        for (int i = 1;i <= n;i++)
            for (int j = 1;j <= m;j++)
                if (b[j] % a[i] == 0) p[i][j] = 1;

        for (int i = 1;i <= n;i++)
        {
            memset(book, 0, sizeof(book));
            if (dfs(i))
                ans++;
        }
        printf("Case %d: %d\n", cases++, ans);
    }
    return 0;
}