結果

問題 No.765 ukuku 2
ユーザー mkawa2mkawa2
提出日時 2022-02-08 18:47:55
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 2,525 ms / 3,000 ms
コード長 2,342 bytes
コンパイル時間 454 ms
コンパイル使用メモリ 87,156 KB
実行使用メモリ 100,584 KB
最終ジャッジ日時 2023-09-05 18:52:43
合計ジャッジ時間 41,379 ms
ジャッジサーバーID
(参考情報)
judge11 / judge12
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 103 ms
71,848 KB
testcase_01 AC 90 ms
71,948 KB
testcase_02 AC 92 ms
72,100 KB
testcase_03 AC 91 ms
72,172 KB
testcase_04 AC 92 ms
71,884 KB
testcase_05 AC 91 ms
72,032 KB
testcase_06 AC 91 ms
72,328 KB
testcase_07 AC 92 ms
72,024 KB
testcase_08 AC 90 ms
71,840 KB
testcase_09 AC 93 ms
72,104 KB
testcase_10 AC 90 ms
71,924 KB
testcase_11 AC 91 ms
71,912 KB
testcase_12 AC 92 ms
71,852 KB
testcase_13 AC 89 ms
71,844 KB
testcase_14 AC 90 ms
71,984 KB
testcase_15 AC 89 ms
72,040 KB
testcase_16 AC 90 ms
72,036 KB
testcase_17 AC 91 ms
71,664 KB
testcase_18 AC 91 ms
71,876 KB
testcase_19 AC 91 ms
71,916 KB
testcase_20 AC 92 ms
71,660 KB
testcase_21 AC 91 ms
71,804 KB
testcase_22 AC 90 ms
72,012 KB
testcase_23 AC 90 ms
71,852 KB
testcase_24 AC 91 ms
72,168 KB
testcase_25 AC 91 ms
72,140 KB
testcase_26 AC 107 ms
76,116 KB
testcase_27 AC 97 ms
76,800 KB
testcase_28 AC 95 ms
75,932 KB
testcase_29 AC 96 ms
75,928 KB
testcase_30 AC 1,972 ms
94,208 KB
testcase_31 AC 1,895 ms
92,324 KB
testcase_32 AC 1,576 ms
90,708 KB
testcase_33 AC 206 ms
99,840 KB
testcase_34 AC 213 ms
100,032 KB
testcase_35 AC 1,226 ms
100,584 KB
testcase_36 AC 1,332 ms
100,284 KB
testcase_37 AC 1,674 ms
100,356 KB
testcase_38 AC 2,405 ms
100,472 KB
testcase_39 AC 2,525 ms
100,504 KB
testcase_40 AC 831 ms
94,316 KB
testcase_41 AC 2,022 ms
94,752 KB
testcase_42 AC 2,250 ms
98,236 KB
testcase_43 AC 2,032 ms
93,716 KB
testcase_44 AC 2,054 ms
94,056 KB
testcase_45 AC 2,312 ms
98,912 KB
testcase_46 AC 2,022 ms
93,732 KB
testcase_47 AC 2,387 ms
96,464 KB
testcase_48 AC 2,337 ms
96,436 KB
testcase_49 AC 2,343 ms
96,732 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 #

def Manacher(s):
    dummy = "@"
    s = dummy+dummy.join(s)+dummy
    i = j = 0
    res = [-1]*len(s)
    while i < len(s):
        while i-j >= 0 and i+j < len(s) and s[i-j] == s[i+j]: j += 1
        res[i] = j-1
        k = 1
        while i-k >= 0 and k+res[i-k]+1 < j:
            res[i+k] = res[i-k]
            k += 1
        i += k
        j -= k
    return res

def solve():
    import sys

    def SI(): return sys.stdin.readline().rstrip()

    from random import randrange

    s = SI()
    n = len(s)
    BASE = randrange(128, 256)
    MOD = (1 << 61)-1

    h = [0]
    pw = [1]
    for c in s:
        h += [h[-1]*BASE%MOD+ord(c)]
        pw += [pw[-1]*BASE%MOD]

    rh = [0]
    for c in s[::-1]:
        rh += [rh[-1]*BASE%MOD+ord(c)]

    def hash(h, l, r):
        return (h[r]-h[l]*pw[r-l]%MOD)%MOD

    dia = Manacher(s)

    def binary_search(l, r, i, j):
        if l > r: return 0
        if l < 0: l = 0
        r += 1
        while l+1 < r:
            m = (l+r)//2
            if hash(h, i-m, i) == hash(rh, n-(j+m), n-j): l = m
            else: r = m
        return l

    ans = 1
    for i in range(1, n):
        r = min(i, n-i)
        if r*2 <= ans: continue
        d = dia[i*2]//2
        if d*2 == n:
            print(n-1)
            exit()
        # delete left
        ni, nj = i-d-1, i+d
        r = min(ni, n-nj)
        if ni >= 0 and (d+r)*2 > ans:
            e = binary_search(ans//2-d, r, ni, nj)
            if (d+e)*2 > ans: ans = (d+e)*2
        # delete right
        ni, nj = i-d, i+d+1
        r = min(ni, n-nj)
        if nj <= n and (d+r)*2 > ans:
            e = binary_search(ans//2-d, r, ni, nj)
            if (d+e)*2 > ans: ans = (d+e)*2

    for i in range(n-1):
        r = min(i, n-i-1)
        if r*2+1 <= ans: continue
        d = dia[i*2+1]//2
        if d*2+1 == n:
            print(n-1)
            exit()
        # delete left
        ni, nj = i-d-1, i+1+d
        r = min(ni, n-nj)
        if ni >= 0 and (d+r)*2+1 > ans:
            e = binary_search((ans-1)//2-d, r, ni, nj)
            if (d+e)*2+1 > ans: ans = (d+e)*2+1
        # delete right
        ni, nj = i-d, i+d+2
        r = min(ni, n-nj)
        if nj <= n and (d+r)*2+1 > ans:
            e = binary_search((ans-1)//2-d, r, ni, nj)
            if (d+e)*2+1 > ans: ans = (d+e)*2+1

    print(ans)

solve()
0