uva : 567 - Risk

#include<cstdio>
#include<cstring>
#include<cmath>
#include<iostream>
#include<queue>
#include<vector>
using namespace std;
int main()
{
    //freopen("input.txt","r",stdin);
    int i,j,k,l,m,n,y=1;
    while(scanf("%d",&n)==1)
    {
        vector<int>country[1000];
        for(i=1;i<=n;i++)
        {
            scanf("%d",&m);
            country[1].push_back(m);
            country[m].push_back(1);
        }
        for(i=2;i<20;i++)
        {
            scanf("%d",&n);
            for(j=1;j<=n;j++)
            {
                scanf("%d",&m);
                country[i].push_back(m);
                country[m].push_back(i);
            }
        }
        int n;
        scanf("%d",&n);
        printf("Test Set #%d\n",y++);
        while(n--)
        {
            int source,destination,d[21],color[21];
            scanf("%d %d",&source,&destination);
            for(i=1;i<=20;i++)
            {
                color[i]=0;
            }
            queue<int>q;
            q.push(source);
            while(!q.empty())
            {
                int u=q.front();
                q.pop();
                if(u==destination)break;
                for(i=0;i<country[u].size();i++)
                {
                    int v=country[u][i];
                    if(color[v]==0)
                    {
                        q.push(v);
                        color[v]=color[u]+1;
                    }
                }
            }
            printf("%2d to %2d: %d\n",source,destination,color[destination]);
        }
        printf("\n");
    }
    return 0;