题解 | #走方格的方案数#

import java.util.*;


// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int n = input.nextInt();
        int m = input.nextInt();
        int[][] arr = new int[n + 1][m + 1];
        for (int i = 1; i < n + 1; i++) {
            for (int j = 1; j < m + 1; j++) {
                if (i == 1) {
                    arr[i][j] = j + 1;
                } else if (j == 1) {
                    arr[i][j] = i + 1;
                } else {
                    arr[i][j] = arr[i - 1][j] + arr[i][j - 1];
                }

            }

        }

        // for (int[] ints : arr) {
        //     System.out.println(Arrays.toString(ints));
        // }
       System.out.println(arr[n][m]);
    }
}