Compilare: user.cpp: In function ‘bool Check(int, std::vector<std::__cxx11::basic_string<char> >&)’: user.cpp:24:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = val; j < x[i].size(); ++j){ ~~^~~~~~~~~~~~~ user.cpp:25:9: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(curr_hash.find(make_pair(has1, has2)) == curr_hash.end()) ^ user.cpp:39:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(curr_hash.find(make_pair(has1, has2)) == curr_hash.end()) ^