为啥全是0！

#include<bits/stdc++.h>
using namespace std;
const int N = 1e4 + 5;
int n,m,s;
int u,v,w;
vector<pair<int,int>> vec[N];
int dis[N];
bool vis[N];
int main()
{
	cin >> n >> m >> s;
	for(int i=1;i<=m;i++)
	{
		cin >> u >> v >> w;	
		vec[u].push_back(make_pair(v,w));
	}	
	for(int i=1;i<=n;i++)
	{
		dis[i] = (111<<3111) - 1;
		dis[i] = 0;
	}
	int maxn = 1e9;
	for(int i=1;i<=n;i++)
	{
		maxn = 1e9;
		for(int j=1;j<=n;j++){
			if(dis[j] < maxn && vis[j] == 0)
			{
				maxn = dis[j];
				u = j;
			}
		}
		for(pair<int,int>v_w:vec[u])
		{
			int v = v_w.first,w = v_w.second;
			dis[v] = min(dis[v],dis[u] + w);
		}
		vis[u] = 1;
	}
	for(int i=1;i<=n;i++)
	{
		if(s == i) cout << 0 << " ";
			else cout << dis[i] << " ";
	}
	return 0;
}