public class Exam_2020_3 {
public static void main(String[] args) {
// TODO Auto-generated method stub
int[][] array = new int[50][50];
int i = 0 ,j = 0;
int num = 2;
array[0][0] = 1;
while(i<49 && j < 49) {
if(i % 2 == 0) { // 偶数
j++;
array[i][j] = num++; // 行数右移
i++;
j--;
while(true) {
if(j == 0) {
array[i][j] = num++;
break;
}
array[i++][j--] = num++;
}
}else {
i++;
array[i][j] = num++; // 行数下移
i--;
j++;
while(true) {
if(i == 0) {
array[i][j] = num++;
break;
}
array[i--][j++] = num++;
}
}
}
for( i = 0;i < array.length;i++) {
for(j = 0;j < array[0].length;j++) {
System.out.print(array[i][j] + " ");
}
System.out.println();
}
System.out.println(array[19][19]);
}
}
