Compilare: main.cpp:3:156: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] 3 | using namespace std;ifstream i("apm.in");ofstream o("apm.out");const t h=3e5;t p[h];vector<vector<t>>g[h+h],f;t a(t x){if(x^p[x])p[x]=a(p[x]);return p[x];}main(){t n,m,x,y,c,s=0;i>>n>>m;iota(p,p+h,0);while(m--){i>>x>>y>>c;g[c+h].push_back({x,y});}for(c=0;c<h+h;c++)for(auto e:g[c]){x=a(e[0]);y=a(e[1]);if(x^y){f.push_back(e);s+=c-h;}p[x]=y;}o<<s<<"\n"<<n-1<<"\n";for(auto e:f)o<<e[0]<<" "<<e[1]<<'\n';} | ^~~~