#include using namespace std; using ll=long long; #define MOD 998244353 #define INF 1000000000000000000 using Graph=vector>>; int main(){ int N,M; cin>>N>>M; vector s(M),t(M); vector d(M); for(int i=0;i>s[i]>>t[i]>>d[i]; s[i]--;t[i]--; } vector> dist(N,vector(N,INF)); for(int i=0;i