結果

問題 No.367 ナイトの転身
ユーザー jp_stejp_ste
提出日時 2016-05-12 19:21:28
言語 Java21
(openjdk 21)
結果
AC  
実行時間 464 ms / 2,000 ms
コード長 4,064 bytes
コンパイル時間 3,662 ms
コンパイル使用メモリ 78,524 KB
実行使用メモリ 60,692 KB
最終ジャッジ日時 2024-10-05 14:04:55
合計ジャッジ時間 8,770 ms
ジャッジサーバーID
(参考情報)
judge1 / judge3
このコードへのチャレンジ
(要ログイン)

テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 113 ms
41,828 KB
testcase_01 AC 114 ms
41,648 KB
testcase_02 AC 117 ms
41,316 KB
testcase_03 AC 120 ms
41,060 KB
testcase_04 AC 100 ms
41,676 KB
testcase_05 AC 108 ms
40,072 KB
testcase_06 AC 137 ms
41,572 KB
testcase_07 AC 98 ms
41,112 KB
testcase_08 AC 116 ms
41,676 KB
testcase_09 AC 117 ms
41,820 KB
testcase_10 AC 408 ms
59,208 KB
testcase_11 AC 464 ms
60,692 KB
testcase_12 AC 237 ms
49,808 KB
testcase_13 AC 239 ms
49,780 KB
testcase_14 AC 354 ms
50,948 KB
testcase_15 AC 137 ms
42,904 KB
testcase_16 AC 299 ms
50,116 KB
testcase_17 AC 175 ms
46,576 KB
testcase_18 AC 187 ms
46,976 KB
testcase_19 AC 224 ms
48,892 KB
testcase_20 AC 164 ms
43,924 KB
testcase_21 AC 225 ms
47,948 KB
testcase_22 AC 117 ms
41,772 KB
testcase_23 AC 116 ms
42,032 KB
testcase_24 AC 118 ms
42,400 KB
testcase_25 AC 126 ms
42,060 KB
testcase_26 AC 110 ms
41,672 KB
権限があれば一括ダウンロードができます

ソースコード

diff #

import java.util.LinkedList;
import java.util.Queue;
import java.util.Scanner;

public class Main2 {
    static int h,w;
    static char list[][];
    static int dp[][][];
    static int goalX, goalY;
    
    static final int NIGHT = 0;
    static final int BISHOP = 1;
    static int nDirX[] = { 1,  1, -1, -1, 2,  2, -2, -2 };
    static int nDirY[] = { 2, -2,  2, -2, 1, -1,  1, -1 };
    static int bDirX[] = { 1,  1, -1, -1 };
    static int bDirY[] = { 1, -1,  1, -1 };
    
    public static void main(String[] args) {
        try (Scanner scan = new Scanner(System.in)) {
            h = Integer.parseInt(scan.next());
            w = Integer.parseInt(scan.next());
            list = new char[h][w];
            dp = new int[h][w][2];
            int startX = 0, startY = 0;
            
            for(int i=0; i<h; i++) {
                String line = scan.next();
                for(int j=0; j<w; j++) {
                    char ch = line.charAt(j);
                    list[i][j] = ch;
                    if(ch == 'G') {
                        goalX = j;
                        goalY = i;
                    } else if(ch == 'S') {
                        startX = j;
                        startY = i;
                    }
                    
                    for(int k=0; k<2; k++) {
                        dp[i][j][k] = Integer.MAX_VALUE;
                    }
                }   
            }
            solve(startX, startY);
            System.out.println(-1);
        }
    }
    
    static void solve(int startX, int startY) {
        
        Queue<Node> q = new LinkedList<>();
        Node s = new Node(startX, startY, 0, NIGHT);
        q.add(s);
        
        while(!q.isEmpty()) {
            
            Node now = q.poll();
            
            if(now.x == goalX && now.y == goalY) {
                System.out.println(now.steps);
                System.exit(0);
            }
            
            if(now.state == NIGHT) {
                if(dp[now.y][now.x][NIGHT] > now.steps) {
                    dp[now.y][now.x][NIGHT] = now.steps;
                } else {           
                    continue;
                }
            } else {
                if(dp[now.y][now.x][BISHOP] > now.steps) {
                    dp[now.y][now.x][BISHOP] = now.steps;
                } else {           
                    continue;
                }
            }
            
            if(now.state == NIGHT) {
              
                for(int i=0; i<8; i++) {
                    int nextX = now.x + nDirX[i];
                    int nextY = now.y + nDirY[i];
                    
                    if(nextX >= 0 && nextX <= w-1 && nextY >= 0 && nextY <= h-1 ) {
                      
                        int nextState = now.state;
                        if(list[nextY][nextX] == 'R') {
                            nextState = BISHOP;
                        }
                      
                        Node next = new Node(nextX, nextY, now.steps+1, nextState);
                        q.add(next);
                    }
                }
              
            } else if(now.state == BISHOP) {
              
                for(int i=0; i<4; i++) {
                    int nextX = now.x + bDirX[i];
                    int nextY = now.y + bDirY[i];
                    
                    if(nextX >= 0 && nextX <= w-1 && nextY >= 0 && nextY <= h-1 ) {
                      
                        int nextState = now.state;
                        if(list[nextY][nextX] == 'R') {
                            nextState = NIGHT;
                        }
                      
                        Node next = new Node(nextX, nextY, now.steps+1, nextState);
                        q.add(next);
                    }
                }
            }
        }
    }
}

class Node {
    int x, y;
    int steps;
    int state;
    Node(int x, int y, int steps, int state) {
        this.x = x;
        this.y = y;
        this.steps = steps;;
        this.state = state;
    }
}
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