Compilare: user.cpp: In function ‘int main()’: user.cpp:306:11: warning: variable ‘fin’ set but not used [-Wunused-but-set-variable] FILE *fin, *fout; ^ user.cpp:311:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &M); scanf("%d", &N); ^ user.cpp:311:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &M); scanf("%d", &N); ^ user.cpp:314:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &number); ^ user.cpp:335:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("exp.out", "w", stdout); ^