Compilare: user.cpp: In function ‘int main()’: user.cpp:81:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < gv.size(); ++i) ^ user.cpp:95:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = start; i < gv.size(); ++i){ ^ user.cpp:127:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size(); ++i) ^ user.cpp:93:22: warning: variable ‘place’ set but not used [-Wunused-but-set-variable] double mdif = 0.0, place = -1; ^ user.cpp:91:1: warning: label ‘label’ defined but not used [-Wunused-label] label: if(true);// VERY good coding practice, hey, if you are looking around in other people's source code, you have no right to judge. ^