BFS+拓扑喜提86pts的好成绩，以及一个离谱的报错信息：

Wrong Answer.wrong output format Unexpected end of file - int32 expected

#include<bits/stdc++.h>
#include<queue>
using namespace std;
int n;
int to[100+5],nxt[100+5],head[100+5];
int degree[100+5];
int cnt;
queue<int> q;
bool vis[100+5];
int main(){
	cin>>n;
	for(int i=1;i<=n;i++){
		int k;
		cin>>k;
		while(k!=0){
			to[++cnt]=k;
			nxt[cnt]=head[i];
			head[i]=cnt;
			degree[to[cnt]]++;
			
			cin>>k;
		}
	}for(int i=1;i<=n;i++)
		if(degree[i]==0)
			q.push(i);
	while(!q.empty()){
		int u=q.front();
		q.pop();
		vis[u]=true;
		cout<<u<<" ";
		for(int i=head[u];i;i=nxt[i]){
			if(!vis[to[i]]){
				degree[to[i]]--;
				if(degree[to[i]]==0) q.push(to[i]);
			}
		}
	}return 0;
}