#include <iostream>
#include <string>
using namespace std;void del(string &s)
{int i=0,j=0;while(i<s.size()){j=i;while(j<s.size() && s[j]==s[i]){j++;}if(j-i>=3){s.erase(i,j-i);//消除重复的i=0;}elsei++;}
}