Compilare: user.cpp: In function ‘int main(int, char**)’: user.cpp:29:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (index == v.size()) { ^ user.cpp:33:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = index; i < v.size(); ++i) { ^ user.cpp:9:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("joc7.in", "r", stdin); ^ user.cpp:10:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("joc7.out", "w", stdout); ^