Compilare: user.cpp: In function ‘int main()’: user.cpp:17:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i <= n; i++) ^ user.cpp:20:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; i++) { ^ user.cpp:26:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int l = 2; l <= n - 1; l++) { ^ user.cpp:27:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n - l; i++) { ^ user.cpp:25:24: warning: unused variable ‘p’ [-Wunused-variable] unsigned long long p, q; ^ user.cpp:25:27: warning: unused variable ‘q’ [-Wunused-variable] unsigned long long p, q; ^ user.cpp:13:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("podm.in", "r", stdin); ^ user.cpp:14:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("podm.out", "w", stdout); ^