Compilare: user.cpp: In function ‘int set_values()’: user.cpp:21:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void solve()’: user.cpp:35:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size() - 1; ++i) ^ user.cpp:36:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < v.size(); ++j) ^