Compilare: user.cpp: In function ‘int main()’: user.cpp:53:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < seq.size() - 1; i++) ^ user.cpp:61:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < seq.size() - 1; i++) ^ user.cpp:18:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("snowball.in", "r", stdin); ^ user.cpp:19:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("snowball.out", "w", stdout); ^