String sorting comparator

#1

Please explain the code… why first line returns false and the next true…
bool comp(string a, string b){
if(a.length()<=b.length() && b.substr(0,a.size())==a) return false;
else if(b.length()<=a.length() && a.substr(0,b.size())==b) return true;
else return a<b;
}

#2

The comparator returns false if a is a prefix of b ; otherwise, it compares lexicographically.

#3

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