結果

問題 No.2411 Reverse Directions
ユーザー detteiuu
提出日時 2024-12-22 06:26:16
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 199 ms / 2,000 ms
コード長 2,236 bytes
コンパイル時間 433 ms
コンパイル使用メモリ 82,164 KB
実行使用メモリ 132,864 KB
最終ジャッジ日時 2024-12-22 06:26:24
合計ジャッジ時間 5,940 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge5
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ファイルパターン 結果
sample AC * 3
other AC * 29
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 # 

from collections import deque

H, W, K, L, R = map(int, input().split())
S = [list(input()) for _ in range(H)]

if (R-L+1)%2 == 1:
    exit(print("No"))

def bfs(sh, sw):
    visited = [[-1]*W for _ in range(H)]
    visited[sh][sw] = 0
    que = deque()
    que.append((sh, sw))
    while que:
        h, w = que.popleft()
        for dh, dw in direction:
            nh, nw = h+dh, w+dw
            if 0<=nh<H and 0<=nw<W and visited[nh][nw] == -1 and S[nh][nw] == ".":
                visited[nh][nw] = visited[h][w]+1
                que.append((nh, nw))
    return visited

def root(h, w, gh, gw, dist, B):
    ans = []
    while [h, w] != [gh, gw]:
        for i, (dh, dw) in enumerate(direction):
            nh, nw = h+dh, w+dw
            if 0<=nh<H and 0<=nw<W and dist[nh][nw] == dist[h][w]-1:
                ans.append(B[i])
                h, w = nh, nw
                break
    return ans

direction = [(-1,0),(0,1),(1,0),(0,-1)]
distS = bfs(0, 0)
distG = bfs(H-1, W-1)
for i in range(H):
    for j in range(W):
        if distS[i][j] == -1 or distG[i][j] == -1:
            continue
        if distS[i][j]+distG[i][j] > K or (distS[i][j]+distG[i][j])%2 != K%2:
            continue
        if distS[i][j] >= L or distS[i][j]%2 == L%2:
            continue
        r = K-R
        if distG[i][j] > r or distG[i][j]%2 != r%2:
            continue
        if 1 <= j < W-1 and S[i][j-1] == S[i][j+1] == ".":
            start = root(i, j, 0, 0, distS, ["D", "L", "U", "R"])[::-1]
            mid = []
            for _ in range((K-distS[i][j]-distG[i][j])//2):
                mid.append("L")
                mid.append("R")
            goal = root(i, j, H-1, W-1, distG, ["U", "R", "D", "L"])
            print("Yes")
            print("".join(start+mid+goal))
            exit()
        if 1 <= i < H-1 and S[i-1][j] == S[i+1][j] == ".":
            start = root(i, j, 0, 0, distS, ["D", "L", "U", "R"])[::-1]
            mid = []
            for _ in range((K-distS[i][j]-distG[i][j])//2):
                mid.append("U")
                mid.append("D")
            goal = root(i, j, H-1, W-1, distG, ["U", "R", "D", "L"])
            print("Yes")
            print("".join(start+mid+goal))
            exit()
print("No")
0