我寻思我跟某同学都按着同一个框架写的啊，比对细节的话，有差别，但效果都一样

问题来了：为啥他AC而我还过不了样例？

#include<iostream>
#include<cstring>
#define re register
using namespace std;

const int N = 2e4;

int q,n,m,k;
int t[N],dp[N][N];;

inline void cs(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	for(re int i = 0;i < N;i ++){
		for(re int j = 0;j < N;j ++){
			dp[i][j] = 99999999;
		} 
	}
}

int main(){
	cs();
	cin>>n>>m;
	for(re int i = 1;i <= n;i ++){
		cin>>t[i];
		dp[i][i] = 0;
	}
	for(re int i = 1;i <= m;i ++){
		int u,v,w;
		cin>>u>>v>>w;
		dp[u][v] = w;
		dp[v][u] = w;
	}
	cin>>q;
	while(q --){
		int x,y,z;
		cin>>x>>y>>z;
		if(t[x] > z || t[y] > z){
			cout<<-1<<"\n";
			continue;
		}
		while(k < n && t[k] <= z){
			for(re int i = 1;i <= n;i ++){
				for(re int j = 1;j <= n;j ++){
					dp[i][j] = dp[j][i] = min(dp[i][j],dp[i][k] + dp[j][k]);
				}
			}
			k ++;
		}
		if(dp[x][y] == 99999999){
			cout<<-1<<"\n";
		}
		else{
			cout<<dp[x][y]<<"\n";
		}
	}
	return 0;
}