Compilare: user.cpp: In function ‘int bfs()’: user.cpp:60:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v[virf].size() ; ++i){ ^ user.cpp: In function ‘void bkt(std::vector<std::pair<int, int> >&, std::string&, int, int)’: user.cpp:103:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < act_sol.size() ; ++i) ^ user.cpp:119:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < sol.size() ; ++i){ ^ user.cpp:121:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ; j < act_sol.size() ; ++j) ^