【java】邻域均值

import java.util.Scanner;
public class Main
{
  static int[][] arr;
  static int n,L,r,t=0;
  public static void main(String[] args)
  {
    Scanner s=new Scanner(System.in);
    n=s.nextInt();
     L=s.nextInt();
    r=s.nextInt();
     t=s.nextInt();
    arr=new int[n+1][n+1];
    for(int i=1;i<=n;i++){
      for(int j=1;j<=n;j++){
        arr[i][j]=s.nextInt()+arr[i-1][j]+arr[i][j-1]-arr[i-1][j-1];
      }
    }
    int count=0;
    for(int i=1;i<=n;i++){
      for(int j=1;j<=n;j++){
        int sum=get_num(Math.max(1,i-r),Math.max(1,j-r),Math.min(n,i+r),Math.min(n,j+r));
        int cnt=get_cnt(Math.max(1,i-r),Math.max(1,j-r),Math.min(n,i+r),Math.min(n,j+r));
        if(sum<=cnt*t){
          count++;
        }
      }
    }
    System.out.println(count);
    s.close();
  }
  public static int get_num(int x1,int y1,int x2,int y2){
    return arr[x2][y2]-arr[x1-1][y2]-arr[x2][y1-1]+arr[x1-1][y1-1];
  }
  public static int get_cnt(int x1,int y1,int x2,int y2){
    return (x2-x1+1)*(y2-y1+1);
  }
}