Compilare: user.cpp: In function ‘int main()’: user.cpp:32:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] { freopen("ferma3.in", "r",stdin); ^ user.cpp:33:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ferma3.out", "w",stdout); ^ user.cpp:36:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d\n", &cer, &n, &m); ^ user.cpp:96:15: warning: ‘cull’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d %d\n%c", ii, jj, cull+'a'-1); ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~