superReducedString-hankerrank

Steve has a string of lowercase characters in range ascii[‘a’..’z’]. He wants to reduce the string to its shortest length by doing a series of operations. In each operation he selects a pair of adjacent lowercase letters that match, and he deletes them. For instance, the string aab could be shortened to b in one operation.

Steve’s task is to delete as many characters as possible using this method and print the resulting string. If the final string is empty, print Empty String

aaabccddd → abccddd → abddd → abd

aa → Empty String

baab → bb → Empty String

string superReducedString(string s) {

for(int i=0;i<s.size()-1;)

{

　　if(s.size()==0)

　　 { return "Empty String";}

　　if(s[i]==s[i+1])

　　{

　　　　s.erase(i,2);

　　　　i=0;

　　 }

　　else

　　{

　　　　i++;

　　 }

}

return s;