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Jump.java
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Jump.java
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package Baekjoon.DP;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
// 24-04-19 20min
// https://www.acmicpc.net/problem/1890
// 참고: https://seokjin2.tistory.com/194
public class Jump {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int size = Integer.parseInt(br.readLine());
int[][] board = new int[size][size];
long[][] dp = new long[size][size];
int[] dx = {1, 0};
int[] dy = {0, 1};
for (int i = 0; i < size; i++) {
String[] split = br.readLine().split(" ");
for (int j = 0; j < size; j++) {
board[i][j] = Integer.parseInt(split[j]);
}
}
dp[0][0] = 1;
for (int i = 0; i < size; i++) {
for (int j = 0; j < size; j++) {
if (dp[i][j] == 0 || board[i][j] == 0)
continue;
for (int dir = 0; dir < 2; dir++) {
int nx = i + dx[dir] * board[i][j];
int ny = j + dy[dir] * board[i][j];
if (nx < 0 || ny < 0 || nx >= size || ny >= size)
continue;
dp[nx][ny] += dp[i][j];
}
}
}
System.out.println(dp[size - 1][size - 1]);
}
}