Compilare: main.cpp: In function 'void dfs(int)': main.cpp:32:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < l1[x].size(); i++) ~~^~~~~~~~~~~~~~ main.cpp: In function 'long long int prim(std::vector<std::pair<int, int> >*)': main.cpp:48:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ;i < L[x].size(); i++) ~~^~~~~~~~~~~~~ main.cpp:71:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ;i < L[nod].size(); i++) ~~^~~~~~~~~~~~~~~ main.cpp:62:13: warning: unused variable 'nod2' [-Wunused-variable] int nod2 = Coada.top().second.first; ^~~~ main.cpp:91:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:119:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++) ~~^~~~~~~~~~