Compilare: user.cpp: In function ‘int main()’: user.cpp:25:23: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘i64 {aka long long int}’ [-Wformat=] printf("%d\n", ans); ^ user.cpp:16:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gfact.in", "r", stdin); ^ user.cpp:17:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gfact.out", "w", stdout); ^ user.cpp:19:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &b, &e); ^