Compilare: user.cpp: In function ‘int main()’: user.cpp:83:50: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen((fileInput + ".in").c_str(), "r", stdin); ^ user.cpp:84:52: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen((fileInput + ".out").c_str(), "w", stdout); ^ user.cpp:144:16: warning: ‘bestk’ may be used uninitialized in this function [-Wmaybe-uninitialized] ansk = bestk; ^ user.cpp:143:16: warning: ‘bestj’ may be used uninitialized in this function [-Wmaybe-uninitialized] ansj = bestj; ^