java怎么过呀，后四个点超时

import java.util.*;
// 1:无需package
// 2: 类名必须Main, 不可修改

public class Main {
    //static int[][] arr=new int[100010][100010];
    static ArrayList<ArrayList<A>> arr=new ArrayList<>();
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        //在此输入您的代码...
        int n= scan.nextInt();
        int m= scan.nextInt();
        while(m-->0){
            ArrayList<A> a=new ArrayList<>();
            int choice=scan.nextInt();
            int i= scan.nextInt();
            int j= scan.nextInt();
            if(choice==1){
                int val= scan.nextInt();

                a.add(new A(i,j,val));
                arr.add(a);
            }else {
                int flag=0;
                for(int ii=0;ii<arr.size();ii++){if(flag==1)
                            break;
                    for(int jj=0;jj<arr.get(ii).size();jj++){

                        if(arr.get(ii).get(jj).i==i&&arr.get(ii).get(jj).j==j){
                            System.out.println(arr.get(ii).get(jj).val);
                            flag=1;
                            break;
                        }

                    }
                }
            }
        }
        scan.close();
    }
}
class A{
    int i;
    int j;
    int val;
    public A(int i, int j, int val) {
        this.i = i;
        this.j = j;
        this.val = val;
    }

    public A(int i, int j) {
        this.i = i;
        this.j = j;
    }
}