Compilare: main.cpp: In function 'int main()': main.cpp:54:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rufe.in","r",stdin); ^ main.cpp:55:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rufe.out","w",stdout); ^ main.cpp:57:41: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%lld",&n,&m,&a,&b,&k); ^