java 代码

import java.util.*;

class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();

        for(int i =0;i < n;i++){
            String s1 = sc.next();
            char[] s = s1.toCharArray();
            int k = 0;
            for(int j =0;j<s.length;j++){
                s[k++] = s[j];
                if(k>=3 && s[k-3]==s[k-2] &&s[k-2] == s[k-1]) k--;
                if(k>=4 && s[k-4]==s[k-3] &&s[k-2] == s[k-1]) k--;
            }

            System.out.println(new String(s).substring(0,k));
        }
    }
}