Compilare: main.cpp: In function 'void dfs(int)': main.cpp:31:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();++i) if(!viz[v[x][i]]) dfs(v[x][i]); ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:49:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<usu[x].size();++j) ~^~~~~~~~~~~~~~ main.cpp:55:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(sol[x].size()<k&&!ms.empty()) ~~~~~~~~~~~~~^~ main.cpp:60:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(++nr[t.a2]<sol[t.a2].size()) ms.insert({sol[t.a2][nr[t.a2]]+val[t.a2],t.a2}); ~~~~~~~~~~^~~~~~~~~~~~~~~~~