Can someone help me to debug this C++ code? It got crash at 19th test-case.

#include<cstdio>
#include<vector>
#include<queue>
using namespace std;

vector<int> p[1005];
vector<int> idxs[10005];
int dist[10005];
int bef[10005];
queue<int> q;

void print(int n)
{
    if(n!=-1)
    {
        print(bef[n]);
        printf("%d ",n);
    }
}

int main()
{
    int n,m,c,d,awl,akh,tmp;
    bool sudah = false;
    scanf("%d%d",&m,&n);
    for(c=0;c<=n;c++)
    {
        dist[c] = 10000000;
        bef[c] = -1;
    }
    for(c=0;c<m;c++)
    {
        scanf("%d",&d);
        while(d--)
        {
            scanf("%d",&tmp);
            p[c].push_back(tmp);
            idxs[tmp].push_back(c);
        }
    }
    scanf("%d%d",&awl,&akh);
    dist[awl] = 0;
    q.push(awl);
    while(!q.empty())
    {
        tmp = q.front();
        q.pop();
        n = idxs[tmp].size();
        for(c=0;c<n;c++)
        {
            m = p[idxs[tmp][c]].size();
            for(d=0;d<m;d++) if(p[idxs[tmp][c]][d]!=tmp) if(dist[p[idxs[tmp][c]][d]] > dist[tmp]+1)
            {
                dist[p[idxs[tmp][c]][d]] = dist[tmp] + 1;
                bef[p[idxs[tmp][c]][d]] = tmp;
                if(p[idxs[tmp][c]][d]==akh) sudah = true;
                else q.push(p[idxs[tmp][c]][d]);
            }
            if(sudah) break;
        }
        if(sudah) break;
    }
    if(dist[akh]==10000000)
    {
        printf("-1\n");
        return 0;
    }
    printf("%d\n",dist[akh]);
    print(akh);
    printf("\n");
    return 0;
}

Thanks in advance.