Compilare: user.cpp: In function ‘int main()’: user.cpp:34:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nr0(mij) >= p) dr = mij - 1; ^ user.cpp:37:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nr0(mij) != p) ^ user.cpp:19:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fact.in", "r", stdin); ^ user.cpp:20:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fact.out", "w", stdout); ^ user.cpp:22:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &p); ^