万万没想到之聪明的编辑

for(int i=2;i<word.length();)
最开始 是 i< len
但是word.length()是变化的 因此不能是len 需要注意

import java.util.Scanner;
import java.util.*;


public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        sc.nextLine();
        for(int i=0;i<n;i++){
            String res = ParseWord(sc.nextLine());
            System.out.println(res);
        }
    }
    public static String ParseWord(String word){
        int len = word.length();
        if(len < 3) return word;

        for(int i=2;i<word.length();){
            if(word.charAt(i-2) == word.charAt(i-1) && word.charAt(i-1) == word.charAt(i)){
                word = word.substring(0,i-1) + word.substring(i,word.length());
            }
            else if(i>2 && word.charAt(i-3) == word.charAt(i-2) && word.charAt(i-1) == word.charAt(i) ){
                word = word.substring(0,i-1) + word.substring(i,word.length());
            }
            else i++;
        }
        return word;
    }
}