Compilare: user.cpp: In function ‘void Optimize()’: user.cpp:59:27: warning: left operand of comma operator has no effect [-Wunused-value] for(int i=N, ok = 1; i>=1, ok; --i) ^ user.cpp: In function ‘void ReadNumber(int&)’: user.cpp:101:48: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, DIM, stdin), poz = 0; ^ user.cpp:105:48: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, DIM, stdin), poz = 0; ^ user.cpp: In function ‘void Read()’: user.cpp:111:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("banana.in", "rt", stdin); ^ user.cpp:112:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("banana.out", "wt", stdout); ^