Compilare: user.cpp: In function ‘int main()’: user.cpp:32:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < input.size(); i++) ^ 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("parola.in", "r", stdin); ^ user.cpp:15:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("parola.out", "w", stdout); ^