Main.java

package DP.P11048;

import java.io.*;
import java.util.*;

public class Main {

    static int N, M;
    static int[][] board;
    static int[][] dp;

    public static void main(String[] args) throws Exception {
        System.setIn(new FileInputStream("src/DP/P11048/input.txt"));
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine());

        N = Integer.parseInt(st.nextToken());
        M = Integer.parseInt(st.nextToken());

        board = new int[N+1][M+1];
        for (int i = 1; i <= N; i++) {
            st = new StringTokenizer(br.readLine());
            for (int j = 1; j <= M; j++) {
                board[i][j] = Integer.parseInt(st.nextToken());
            }
        }

        dp = new int[N+1][M+1];
        for (int i = 1; i <= N; i++) {
            for (int j = 1; j <= M; j++) {
                dp[i][j] = board[i][j] + Math.max(Math.max(dp[i-1][j], dp[i-1][j-1]), dp[i][j-1]);
            }
        }

        System.out.println(dp[N][M]);
    }
}