I was having doubt in the editorial code,
can you tell me what is the meaning of this line
string ros = duplicateChar(s.substr(1));
and duplicateChar(s) is a recursive function.
I want to know what output this statement will give if i give input “hello”.
s.substr(1) is used to provide the substring of s starting from 1 to the last character.
u can read about substr function from
http://www.cplusplus.com/reference/string/string/substr/
s.substr(1) would provide u ‘ello’
then there is recursive call from “ello”
again s.substr is called -> ‘llo’
this happens until
if (s.size() <= 1)
{
return s;
}