Compilare: user.cpp: In member function ‘std::vector<int> ZAlgo::solve()’: user.cpp:136:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < c.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:173:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size() && i < 1000; i++) ^ user.cpp:162:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in", "r", stdin); ^ user.cpp:163:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out", "w", stdout); ^