Compilare: user.cpp: In function ‘void reset()’: user.cpp:16:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; i++) ^ user.cpp: In function ‘int main()’: user.cpp:21:25: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(IN, "r", stdin); ^ user.cpp:22:27: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(OUT, "w", stdout); ^