Compilare: user.cpp:1:18: warning: extra tokens at end of #include directive [enabled by default] #include <cstdio> ^ user.cpp: In function ‘void R()’: user.cpp:17:22: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(f, 1, F, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:48:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lupu.in","r",stdin); ^ user.cpp:49:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lupu.out","w",stdout); ^