Compilare: main.cpp: In function 'int main()': main.cpp:73:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("input", "r", stdin); ^ main.cpp:42:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] #define files(TASK_NAME) read(TASK_NAME); write(TASK_NAME) ^ main.cpp:75:5: note: in expansion of macro 'files' files(TASK_NAME); ^~~~~ main.cpp:75:21: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] files(TASK_NAME); ^