Compilare: user.cpp: In function ‘void read(unsigned int*, unsigned int)’: user.cpp:12:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < n; i++) ^ user.cpp: In function ‘int main()’: user.cpp:29:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < n; i++){ ^ user.cpp:23:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fold.in", "r", stdin); ^ user.cpp:24:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fold.out", "w", stdout); ^