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:174:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size() && i < 1000; i++) ^ user.cpp:164:39: 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:165:41: 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); ^ user.cpp:168:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(a); gets(b); ^ user.cpp:168:21: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(a); gets(b); ^ /tmp/cczdPXmF.o: In function `main': user.cpp:(.text.startup+0x64): warning: the `gets' function is dangerous and should not be used.