結果

問題 No.1916 Making Palindrome on Gird
ユーザー tamatotamato
提出日時 2022-04-29 22:24:07
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 299 ms / 3,000 ms
コード長 2,366 bytes
コンパイル時間 259 ms
コンパイル使用メモリ 82,368 KB
実行使用メモリ 93,140 KB
最終ジャッジ日時 2024-06-29 03:59:23
合計ジャッジ時間 5,610 ms
ジャッジサーバーID
(参考情報)
judge3 / judge5
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 30
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 #
プレゼンテーションモードにする

mod = 1000000007
def main():
import sys
input = sys.stdin.readline
H, W = map(int, input().split())
G = []
for _ in range(H):
G.append(input().rstrip('\n'))
dp = [[0] * H for _ in range(H)]
if G[0][0] != G[-1][-1]:
print(0)
exit()
dp[0][H-1] = 1
for hw in range((H + W - 2) // 2):
dp_new = [[0] * H for _ in range(H)]
for hl in range(H):
wl = hw - hl
if wl < 0 or wl >= W:
continue
for hr in range(H):
wr = H + W - 2 - hw - hr
if wr < 0 or wr >= W:
continue
if hl != H - 1:
hl_new = hl + 1
sl = G[hl_new][wl]
if hr != 0:
hr_new = hr - 1
sr = G[hr_new][wr]
if sl == sr:
dp_new[hl_new][hr_new] = (dp_new[hl_new][hr_new] + dp[hl][hr])%mod
if wr != 0:
wr_new = wr - 1
sr = G[hr][wr_new]
if sl == sr:
dp_new[hl_new][hr] = (dp_new[hl_new][hr] + dp[hl][hr]) % mod
if wl != W - 1:
hl_new = hl
sl = G[hl_new][wl+1]
if hr != 0:
hr_new = hr - 1
sr = G[hr_new][wr]
if sl == sr:
dp_new[hl_new][hr_new] = (dp_new[hl_new][hr_new] + dp[hl][hr]) % mod
if wr != 0:
wr_new = wr - 1
sr = G[hr][wr_new]
if sl == sr:
dp_new[hl_new][hr] = (dp_new[hl_new][hr] + dp[hl][hr]) % mod
dp = dp_new
if (H + W) & 1:
ans = 0
for hl in range(H):
wl = (H + W - 2) // 2 - hl
for hr in range(H):
wr = (H + W - 2) // 2 + 1 - hr
if abs(hl - hr) + abs(wl - wr) == 1:
if 0 <= wl < W and 0 <= wr < W:
ans = (ans + dp[hl][hr])%mod
print(ans)
else:
ans = 0
for hl in range(H):
ans = (ans + dp[hl][hl])%mod
print(ans)
if __name__ == '__main__':
main()
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