結果

問題 No.599 回文かい
ユーザー はまやんはまやんはまやんはまやん
提出日時 2017-11-25 01:20:41
言語 C++14
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 166 ms / 4,000 ms
コード長 4,820 bytes
コンパイル時間 1,947 ms
コンパイル使用メモリ 179,624 KB
実行使用メモリ 6,944 KB
最終ジャッジ日時 2024-05-05 11:59:03
合計ジャッジ時間 2,859 ms
ジャッジサーバーID
(参考情報)
judge1 / judge4
このコードへのチャレンジ
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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 2 ms
6,812 KB
testcase_01 AC 2 ms
6,940 KB
testcase_02 AC 2 ms
6,940 KB
testcase_03 AC 2 ms
6,944 KB
testcase_04 AC 2 ms
6,940 KB
testcase_05 AC 2 ms
6,940 KB
testcase_06 AC 2 ms
6,940 KB
testcase_07 AC 1 ms
6,944 KB
testcase_08 AC 1 ms
6,940 KB
testcase_09 AC 2 ms
6,940 KB
testcase_10 AC 2 ms
6,940 KB
testcase_11 AC 2 ms
6,944 KB
testcase_12 AC 3 ms
6,940 KB
testcase_13 AC 3 ms
6,944 KB
testcase_14 AC 98 ms
6,944 KB
testcase_15 AC 8 ms
6,940 KB
testcase_16 AC 144 ms
6,944 KB
testcase_17 AC 166 ms
6,940 KB
testcase_18 AC 2 ms
6,940 KB
testcase_19 AC 1 ms
6,940 KB
testcase_20 AC 1 ms
6,940 KB
evil_0.txt AC 41 ms
6,940 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 #

#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)
#define fore(i,a) for(auto &i:a)
#pragma GCC optimize ("-O3")
using namespace std; void _main(); int main() { cin.tie(0); ios::sync_with_stdio(false); _main(); }
//---------------------------------------------------------------------------------------------------
template<int MOD> struct ModInt {
    static const int Mod = MOD; unsigned x; ModInt() : x(0) { }
    ModInt(signed sig) { x = sig < 0 ? sig % MOD + MOD : sig % MOD; }
    ModInt(signed long long sig) { x = sig < 0 ? sig % MOD + MOD : sig % MOD; }
    int get() const { return (int)x; }
    ModInt &operator+=(ModInt that) { if ((x += that.x) >= MOD) x -= MOD; return *this; }
    ModInt &operator-=(ModInt that) { if ((x += MOD - that.x) >= MOD) x -= MOD; return *this; }
    ModInt &operator*=(ModInt that) { x = (unsigned long long)x * that.x % MOD; return *this; }
    ModInt &operator/=(ModInt that) { return *this *= that.inverse(); }
    ModInt operator+(ModInt that) const { return ModInt(*this) += that; }
    ModInt operator-(ModInt that) const { return ModInt(*this) -= that; }
    ModInt operator*(ModInt that) const { return ModInt(*this) *= that; }
    ModInt operator/(ModInt that) const { return ModInt(*this) /= that; }
    ModInt inverse() const { long long a = x, b = MOD, u = 1, v = 0;
        while (b) { long long t = a / b; a -= t * b; std::swap(a, b); u -= t * v; std::swap(u, v); }
        return ModInt(u); }
    bool operator==(ModInt that) const { return x == that.x; }
    bool operator!=(ModInt that) const { return x != that.x; }
    ModInt operator-() const { ModInt t; t.x = x == 0 ? 0 : Mod - x; return t; }
};
template<int MOD> ostream& operator<<(ostream& st, const ModInt<MOD> a) { st << a.get(); return st; };
template<int MOD> ModInt<MOD> operator^(ModInt<MOD> a, unsigned long long k) {
    ModInt<MOD> r = 1; while (k) { if (k & 1) r *= a; a *= a; k >>= 1; } return r; }
typedef ModInt<1000000007> mint;
typedef ModInt<1000000007> mint1;
typedef ModInt<1000000009> mint2;
int getrand(int l, int r) { // [l, r]
    static uint32_t y = time(NULL);
    y ^= (y << 13); y ^= (y >> 17);
    y ^= (y << 5);
    return y % (r - l + 1) + l;
}
struct RollingHash {
    int primes[10] = { 10007, 10009, 10037, 10039, 10061, 10067, 10069, 10079, 10091, 10093 };
    mint1 p1; mint2 p2;
    int n;
    vector<mint1> m1; vector<mint2> m2;
    vector<mint1> v1; vector<mint2> v2;

    RollingHash() {
        rep(i, 0, 101) { int a = getrand(0, 9); int b = getrand(0, 9); swap(primes[a], primes[b]); }
        p1 = primes[0], p2 = primes[1];
    }

    void init(string s, char o = 'a') {
        vector<int> v;
        fore(c, s) v.push_back(c - o);
        init(v);
    }

    void init(vector<int> s) {
        n = s.size();
        m1.resize(n); m2.resize(n); v1.resize(n); v2.resize(n);

        m1[0] = 1; m2[0] = 1;
        v1[0] = s[0]; v2[0] = s[0];

        rep(i, 1, n) {
            m1[i] = m1[i - 1] * p1;
            m2[i] = m2[i - 1] * p2;
            v1[i] = v1[i - 1] + m1[i] * s[i];
            v2[i] = v2[i - 1] + m2[i] * s[i];
        }
    }
    inline pair<mint1, mint2> hash(int l, int r) { // s[l..r]
        assert(l <= r); assert(r < n);
        mint1 a = v1[r];
        if (l) a -= v1[l - 1];
        a *= m1[n - 1 - r];

        mint2 b = v2[r];
        if (l) b -= v2[l - 1];
        b *= m2[n - 1 - r];

        return { a, b };
    }
};
/*---------------------------------------------------------------------------------------------------
            ∧_∧  
      ∧_∧  (´<_` )  Welcome to My Coding Space!
     ( ´_ゝ`) /  ⌒i     
    /   \     | |     
    /   / ̄ ̄ ̄ ̄/  |  
  __(__ニつ/     _/ .| .|____  
     \/____/ (u ⊃  
---------------------------------------------------------------------------------------------------*/




string S;
int N;
RollingHash rh;
//---------------------------------------------------------------------------------------------------
mint memo[10101];
int vis[10101];
mint f(int L, int R) {
    if (vis[L]) return memo[L];

    mint res = 1;
    if (L == R) res = 1;
    else if (L + 1 == R) {
        if (S[L] == S[R]) res = 2;
        else res = 1;
    } else {
        int l = L + 1, r = R - 1;
        while (l - 1 <= r) {
            if (rh.hash(L, l - 1) == rh.hash(r + 1, R)) res += f(l, r);
            l++;
            r--;
        }
    }

    vis[L] = 1;
    return memo[L] = res;
}
//---------------------------------------------------------------------------------------------------
void _main() {
    cin >> S;
    N = S.length();
    rh.init(S);
    cout << f(0, N - 1) << endl;
}
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