Compilare: user.cpp: In member function ‘void Container::_qsort(int, int)’: user.cpp:66:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(vec[ i ] < piv) i++; ^ user.cpp:68:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(vec[ j ] > piv) j--; ^ user.cpp: In function ‘int main()’: user.cpp:84:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(FIN, "r", stdin); ^ user.cpp:86:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&N); ^ user.cpp:90:75: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(uint i = 0, elem; i < N; i++) scanf("%d", &elem), vec.push( elem ); ^