#include #pragma GCC optimize("Ofast") #define _GLIBCXX_DEBUG using namespace std; using std::cout; using std::cin; using std::endl; using ll=long long; using ld=long double; ll ILL=1167167167167167167; const int INF=2100000000; const ll mod=998244353; #define rep(i,a) for (ll i=0;i using _pq = priority_queue, greater>; template ll LB(vector &v,T a){return lower_bound(v.begin(),v.end(),a)-v.begin();} template ll UB(vector &v,T a){return upper_bound(v.begin(),v.end(),a)-v.begin();} template bool chmin(T &a,const T &b){if(a>b){a=b;return 1;}else return 0;} template bool chmax(T &a,const T &b){if(a void So(vector &v) {sort(v.begin(),v.end());} template void Sore(vector &v) {sort(v.begin(),v.end(),[](T x,T y){return x>y;});} void yneos(bool a){if(a) cout<<"Yes\n"; else cout<<"No\n";} namespace po167{ struct UFtree { std::vector wei; std::vector q; int component; UFtree(int n):wei(n),component(n),par(n){ for(int i=0;i par; }; } using po167::UFtree; using len_type=int; struct edge{ int to; len_type length; }; len_type dijkstra_movement(edge e,int from,len_type t){ return t+e.length; } vector dijkstra(vector> &G,int start,len_type inf){ int M=G.size(); assert(M>start&&start>=0); vector seen(M,inf); seen[start]=0; priority_queue,vector>,greater>> pq; pq.push({0,start}); while(!pq.empty()){ len_type time; int ver; tie(time,ver)=pq.top(); pq.pop(); if(seen[ver]>t; rep(i,t) solve(); } void solve(){ int N,M; cin>>N>>M; vector> e(M); rep(i,M){ int a,b,c; cin>>a>>b>>c; a--,b--; e[i]={c,a,b}; } UFtree T(N); Sore(e); int w=0; rep(i,M){ T.unite(get<1>(e[i]),get<2>(e[i])); if(T.same(0,N-1)){ w=get<0>(e[i]); break; } } vector> G(N); rep(i,M){ if(get<0>(e[i])>=w){ int a,b,c; tie(c,a,b)=e[i]; G[a].push_back({b,1}); G[b].push_back({a,1}); } } cout<