memos on C++

bits/stdc++.h

["cat","cats","catsdogcats","dog","dogcatsdog","hippopotamuses","rat","ratcatdogcat"]
sort(test.begin(),test.end(),[](A x,A y){return x.a>y.a;});

[“hippopotamuses”,“ratcatdogcat”,“catsdogcats”,“dogcatsdog”,“cats”,“cat”,“dog”,“rat”]

string substr(start, len)