Compilare: user.cpp: In function ‘int eval(int, int, int)’: user.cpp:22:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t = lvl;t<ops.size();++t) { ^ user.cpp:41:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] return h[gb[st]]; ^ user.cpp: In function ‘std::string getp(std::string&)’: user.cpp:52:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();++i) { ^ user.cpp: In function ‘void update(int, std::vector<char>&)’: user.cpp:72:8: warning: array subscript has type ‘char’ [-Wchar-subscripts] h[c] = (bits)%2; ^ user.cpp: In function ‘int make(char, int, int)’: user.cpp:19:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:78:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("logic.in","r",stdin); ^ user.cpp:79:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("logic.out","w",stdout); ^