UVa 11045 My T-shirt suits me / 二分图

二分图建图 判断是否是完全匹配就行

最大流也行

#include <cstdio>
#include <cstring>
const int MAX = 300;
int a[MAX][MAX];
int Match[MAX];
bool vis[MAX];
char str[7][10] = {"XXL","XL","L","M","S","XS"};
int n,m;

int get(char *s)
{
	for(int i = 0;i < 6; i++)
	{
		if(strcmp(s,str[i]) == 0)
		{
			return i + 1;
		}
	}
}

bool dfs(int u)
{
	int i;
	for(i = i;i <= m; i++)
	{
		if(!a[u][i])
			continue;
		if(vis[i])
			continue;
		vis[i] = true;
		if(Match[i] == -1 || dfs(Match[i]))
		{
			Match[i] = u;
			return true;
		}
	}
	return false;
}
int match()
{
	int ret = 0;
	int i;
	memset(Match,-1,sizeof(Match));
	for(i = 1;i <= n; i++)
	{
		memset(vis,false,sizeof(vis));
		if(dfs(i))
			ret++;
	}
	return ret;
}
int main()
{
	int t,i,j;
	char s1[10];
	char s2[10];
	scanf("%d",&t); 
	while(t--)
	{
		scanf("%d %d",&n,&m);
		memset(a,0,sizeof(a));
		for(i = 1;i <= m; i++)
		{
			scanf("%s %s",s1,s2);
			int id1 = get(s1);
			int id2 = get(s2);
			for(j = 0;j < n/6; j++)
			{
				a[id1+6*j][i] = 1;
				a[id2+6*j][i] = 1;
			}
		}
		if(match() == m)
			puts("YES");
		else
			puts("NO");
	}
	return 0;
}