Compilare: user.cpp: In function ‘void buf(int&)’: user.cpp:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void baga()’: user.cpp:140: warning: unused variable ‘sum’ user.cpp: In function ‘void rezolva()’: user.cpp:175: warning: unused variable ‘sum’ user.cpp: In function ‘int main()’: user.cpp:189: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result