#include "swap.h"
#include <bits/stdc++.h>
using namespace std;
int const N=1e6;
vector<pair<int,int>> g[N];
int used[N];
int mx,check;
void dfs(int v,int pr){
if (check){
return;
}
used[v]=1;
for(auto it : g[v]){
if (it.first==pr)continue;
if (used[it.first]==1){
check=true;
}else{
dfs(it.first,v);
}
}used[v]=2;
}
void init(int N, int M,
std::vector<int> U, std::vector<int> V, std::vector<int> W) {
for(int i=0;i<M;i++){
g[U[i]].push_back({V[i],W[i]});
g[V[i]].push_back({U[i],W[i]});
mx=max(mx,W[i]);
}dfs(1,1);
}int getMinimumFuelCapacity(int X, int Y) {
if (check)return mx;
return -1;
}
