Compilare: user.cpp: In function ‘int32_t main()’: user.cpp:26:9: warning: unused variable ‘mx’ [-Wunused-variable] int mx = -1; ^ user.cpp:15:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ab2.in","r",stdin); ^ user.cpp:16:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ab2.out","w",stdout); ^