結果

問題 No.599 回文かい
ユーザー nvt4s
提出日時 2019-09-02 21:16:15
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 682 ms / 4,000 ms
コード長 3,495 bytes
コンパイル時間 1,191 ms
コンパイル使用メモリ 103,988 KB
実行使用メモリ 6,824 KB
最終ジャッジ日時 2024-12-17 17:01:58
合計ジャッジ時間 5,419 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge5
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ファイルパターン 結果
other AC * 22
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

#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <iostream>
#include <istream>
#include <iterator>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>
#include <tuple>
#include <iomanip>
#include <cstring>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<ll> vec;
typedef vector<vec> mat;
#define rep(i, n) for(ll i = 0; i < (n); i++)
#define revrep(i, n) for(ll i = (n-1); i >= 0; i--)
#define pb push_back
#define f first
#define s second
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
ll max3(ll a, ll b, ll c){return max(a, max(b, c));};
ll min3(ll a, ll b, ll c){return min(a, min(b, c));};
ll max4(ll a, ll b, ll c, ll d){return max(max(a, b), min(c, d));};
ll min4(ll a, ll b, ll c, ll d){return min(min(a, b), min(c, d));};
ll max5(ll a, ll b, ll c, ll d, ll e){return max(max(a, b), max3(c, d, e));};
ll min5(ll a, ll b, ll c, ll d, ll e){return min(min(a, b), min3(c, d, e));};
const ll INFL = 1LL << 60;//10^18 = 2^60
const int INF = 1 << 30;//10^9
ll MOD = 1000000007;
//ll MOD = 998244353;
vector<ll> dy = {0, 0, 1, -1, 1, 1, -1, -1, 0};
vector<ll> dx = {1, -1, 0, 0, 1, -1, 1, -1, 0};
ll pow_long(ll x, ll k){
  ll res = 1;
  while(k > 0){
    if(k % 2) res *= x;
    x *= x;
    k /= 2;
  }
  return res;
}
ll pow_mod(ll x, ll k){
  x %= MOD; x += MOD; x %= MOD;
  ll res = 1;
  while(k > 0){
    if(k % 2){
      res *= x; res %= MOD;
    }
    x *= x; x %= MOD;
    k /= 2;
  }
  return res;
}
ll inverse(ll x){return pow_mod(x, MOD - 2);};
ll gcd(ll a, ll b){
    if(b == 0) return a;
    return gcd(b, a % b);
}
ll lcm(ll x, ll y){return x / gcd(x, y) * y;};
ll kai_mod(ll x){
  if(x == 0) return 1;
  return x * kai_mod(x-1) % MOD;
}
/*
//コンビネーション
const int MAXcomb = 200010;
ll fac[MAXcomb], finv[MAXcomb], inv[MAXcomb];
//facはn!,finvは1/n!
//invは逆元
void COMinit(){
    fac[0] = fac[1] = 1;
    finv[0] = finv[1] = 1;
    inv[1] = 1;
    for(int i = 2; i < MAXcomb; i++){
        fac[i] = fac[i-1] * i % MOD;
        inv[i] = MOD - inv[MOD%i] * (MOD/i) % MOD;
        finv[i] = finv[i-1] * inv[i] % MOD;
    }
}
ll comb(int n, int k){
    if(n < k) return 0;
    if(n < 0 || k < 0) return 0;
    return fac[n] * finv[k] % MOD * finv[n-k] % MOD;
}
*/
struct RollingHash{
  string S;
  ll sl;//Sのサイズ
  vector<ll> hashed, power;
  ll base = 998244353;
  ll MOD = 1000000007;
  void getS(string S){
    S = S;
    sl = S.size();
    hashed.resize(sl + 1, 0);
    power.resize(sl + 1);
    power[0] = 1;
    rep(i, sl){
      power[i+1] = (power[i] * base) % MOD;
      hashed[i+1] = (hashed[i] * base + S[i]) % MOD;
    }
  }
  ll getHash(ll l, ll r){//1-index
    //abcdef => (2, 4] => cd
    //abcdef => (0, 6] => abcdef
    ll res = ((hashed[r] - hashed[l] * power[r-l]) % MOD + MOD) % MOD;
    return res;
  }
  //使ったことない
  ll connect(ll hash1, ll hash2, ll hash2size){
    ll res = (hash1 * power[hash2size] + hash2) % MOD;
    return res;
  }
};
int main(){
  string S; cin >> S;
  ll sl = S.size();
  RollingHash SH;
  SH.getS(S);
  vector<ll> dp(sl/2+1, 0);
  dp[0] = 1;
  for(ll i = 1; i <= sl/2; i++){
    for(ll j = 1; j <= i; j++){
      if(SH.getHash(i-j, i) == SH.getHash(sl-i, sl-(i-j))){
        dp[i] += dp[i-j];
        dp[i] %= MOD;
      }
    }
  }
  ll ans = 0;
  rep(i, sl/2+1) ans = (ans + dp[i]) % MOD;
  cout << ans << endl;
}
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