백준 14494 java

import java.util.Scanner;

public class bj14494 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int i, j;
        int n, m;
        long dp[][];

        n = scanner.nextInt();
        m = scanner.nextInt();

        dp = new long[n + 1][m + 1];

        for(i = 0; i <= n; i++)
        {
            dp[i][1] = 1;
        }
        for(j = 0; j <= m; j++)
        {
            dp[1][j] = 1;
        }
        for(i = 2; i <= n; i++)
        {
            for(j = 2; j <= m; j++)
            {
                dp[i][j] = ((dp[i-1][j] + dp[i][j-1]) % 1000000007 + dp[i-1][j-1]) % 1000000007;
            }
        }
        System.out.println(dp[n][m]);

        scanner.close();
    }
}