Compilare: user.cpp: In function ‘int nrE(std::__cxx11::string)’: user.cpp:48:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.size(); i++){ ^ user.cpp: In function ‘int energie(std::__cxx11::string)’: user.cpp:59:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<s.size(); j++){ ^ user.cpp: In function ‘int BFS(int)’: user.cpp:75:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<graph[x].size(); j++){ ^ user.cpp: In function ‘int find_root(int)’: user.cpp:116:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void Kruskal()’: user.cpp:141:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; arbore.size()<n-1; i++){ ^ user.cpp: In function ‘int main()’: user.cpp:185:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<arbore.size(); i++){ ^