Compilare: user.cpp: In function ‘void solve(int)’: user.cpp:13:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < V[pos].size(); i++ ) ^ user.cpp:17:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < V[pos].size(); i++ ) ^ user.cpp: In function ‘int main()’: user.cpp:68:14: warning: unused variable ‘ok’ [-Wunused-variable] bool ok = true; ^ user.cpp: In function ‘bool compare(int)’: user.cpp:35:1: warning: control reaches end of non-void function [-Wreturn-type] } ^