Compilare: user.cpp: In function ‘int XValue(int, std::vector<int>&)’: user.cpp:86:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while((pivot + 1) <= vec.size() - 1 && vec[pivot + 1] == vec[pivot]) ^ user.cpp: In function ‘int highXValue(int, std::vector<int>&)’: user.cpp:115:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while((pivot + 1) <= vec.size() - 1 && vec[pivot + 1] == vec[pivot]) ^ user.cpp: In function ‘int main()’: user.cpp:58:8: warning: ‘ret’ may be used uninitialized in this function [-Wmaybe-uninitialized] ret++; ^