#include using namespace std; typedef signed long long ll; #define _P(...) (void)printf(__VA_ARGS__) #define FOR(x,to) for(x=0;x<(to);x++) #define FORR(x,arr) for(auto& x:arr) #define FORR2(x,y,arr) for(auto& [x,y]:arr) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) template bool chmax(T &a, const T &b) { if(a bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;} //------------------------------------------------------- int N,M; int S[101010],T[101010],D[101010]; pair CE[101010]; vector> E[101010]; int dp[101010]; template class UF { public: vector par,rank,cnt; UF() {par=rank=vector(um,0); cnt=vector(um,1); for(int i=0;irank[y]) return par[x]=y; rank[x]+=rank[x]==rank[y]; return par[y]=x; } }; UF<101010> uf; void solve() { int i,j,k,l,r,x,y; string s; cin>>N>>M; FOR(i,M) { cin>>S[i]>>T[i]>>D[i]; S[i]--; T[i]--; CE[i]={-D[i],i}; E[S[i]].push_back({T[i],D[i]}); E[T[i]].push_back({S[i],D[i]}); } sort(CE,CE+M); int W; FOR(i,M) { x=CE[i].second; uf(S[x],T[x]); if(uf[0]==uf[N-1]) { W=D[x]; break; } } FOR(i,N) dp[i]=1<<20; dp[0]=0; queue Q; Q.push(0); while(Q.size()) { int cur=Q.front(); Q.pop(); FORR2(e,c,E[cur]) if(c>=W&&dp[e]>dp[cur]+1) { dp[e]=dp[cur]+1; Q.push(e); } } cout<