hdu 1317 XYZZY spfa判断负环

#include<stdio.h>
#include<queue>
#include<string.h>

using namespace std;

const int N = 105;
const int inf = 1 << 28;

int a

, c
;
int dis
;
int cost
;
int vis
;

int n;

bool spfa()
{
	memset(dis, 0, sizeof(dis));
	memset(c, 0, sizeof(c));
	memset(vis, 0, sizeof(vis));
	queue<int> q;
	while( !q.empty() )
		q.pop();
	dis[1] = 100;
	q.push(1);
	vis[1] = 1;
	while( !q.empty() )
	{
		int now = q.front();
		q.pop();
		vis[now] = 0;
		if( now == n )
		{
			return 1;
		}
		if( c[now] == n+1 )
		{
			continue;
		}
		c[now]++;
		if( c[now] == n+1 )
		{
			dis[now] = inf;
		}
		for( int i = 1; i <= n; i++ )
		{
			if( a[now][i] )
			{
				if( dis[i] < dis[now] + cost[i] && dis[now] + cost[i] > 0 )
				{
					dis[i] = dis[now] + cost[i];
					if( !vis[i] )
					{
						vis[i] = 1;
						q.push(i);
					}
				} 
			}
		}
	}
	return 0;
}

int main()
{
	while( ~scanf("%d", &n) && n != -1 )
	{
		memset(a, 0, sizeof(a));
		for( int i = 1; i <= n; i++ )
		{
			int num;
			scanf("%d%d", &cost[i], &num);
			for( int j = 1; j <= num; j++ )
			{
				int to;
				scanf("%d", &to);
				a[i][to] = 1;
			}
		}
		int ans = spfa();
		if( ans )
			printf("winnable\n");
		else
			printf("hopeless\n");
	}
	return 0;
}