Compilare: user.cpp: In constructor ‘Container::Container(uint, std::vector<unsigned int>)’: user.cpp:38:12: warning: ‘Container::N’ will be initialized after [-Wreorder] uint N; ^ user.cpp:37:25: warning: ‘std::vector<unsigned int> Container::vec’ [-Wreorder] std::vector<uint> vec; ^ user.cpp:15:7: warning: when initialized here [-Wreorder] Container(uint _N, std::vector<uint> _vec) ^ user.cpp: In member function ‘void Container::_qsort(int, int)’: user.cpp:61:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(vec[ i ] < piv) i++; ^ user.cpp:63:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(vec[ j ] > piv) j--; ^ user.cpp: In function ‘int main()’: user.cpp:93:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < N; ++i) { ^ user.cpp:81:29: 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:83:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&N); ^ user.cpp:85:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(str); ^ /tmp/ccpEfJ4w.o: In function `main': user.cpp:(.text.startup+0x77): warning: the `gets' function is dangerous and should not be used.