Compilare: user.cpp: In member function ‘void InputReader::advance()’: user.cpp:32:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:10:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^ user.cpp: In function ‘int solve(int*, int, int*, int)’: user.cpp:54:30: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] return max(A[k], B[K - k]); ^