結果
| 問題 |
No.599 回文かい
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2019-12-07 23:23:46 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 3,699 bytes |
| コンパイル時間 | 1,217 ms |
| コンパイル使用メモリ | 105,884 KB |
| 実行使用メモリ | 5,248 KB |
| 最終ジャッジ日時 | 2024-12-26 15:42:32 |
| 合計ジャッジ時間 | 3,090 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 18 WA * 4 |
ソースコード
#include <iostream>
#include <algorithm>
#include <iomanip>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <numeric>
#include <bitset>
#include <cmath>
#include <chrono>
static const int MOD = 1000000007;
using ll = long long;
using namespace std;
template<class T> constexpr T INF = ::numeric_limits<T>::max()/32*15+208;
using u64 = unsigned long long;
constexpr u64 M = (1UL << 61) - 1;
constexpr u64 POSITIVISER = M * 3;
constexpr u64 MASK30 = (1UL << 30) - 1;
constexpr u64 MASK31 = (1UL << 31) - 1;
class rolling_hash_u64 {
static u64 get_base(){
u64 z = (static_cast<uint64_t>((chrono::system_clock::now().time_since_epoch().count())&((1LL << 32)-1)))+0x9e3779b97f4a7c15;
z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
z = (z % (M-2))+1;
return z;
}
static u64 &B() {
static u64 B_ = (get_base())%(M-2)+2;
return B_;
}
static vector<u64> &p() {
static vector<u64> p_{1, B()};
return p_;
}
static inline u64 mul(u64 x, u64 y){
u64 a = x >> 31, b = x & MASK31, c = y >> 31, d = y & MASK31, e = b*c+a*d;
return (a*c << 1) + b*d + ((e & MASK30) << 31) + (e >> 30);
}
static inline u64 calc_mod(u64 val){
val = (val & M) + (val >> 61);
if(val > M) val -= M;
return val;
}
public:
vector<u64> hash;
explicit rolling_hash_u64(const string &s) {
if(p().size() <= s.size()){
int l = p().size();
p().resize(s.size()+1);
for (int i = l; i < p().size(); ++i) {
p()[i] = calc_mod(mul(p()[i-1], p()[1]));
}
}
hash.resize(s.size()+1, 0);
for (int i = 0; i < s.size(); ++i) {
hash[i+1] = calc_mod(mul(hash[i],B()) + s[i]);
}
};
u64 get(int l, int r){
return calc_mod(hash[r] + POSITIVISER - mul(hash[l], p()[r-l]));
}
};
template<ll M = 1000000007>
struct modint{
ll val;
modint(): val(0){}
template<typename T>
explicit modint(T t){val = t%M; if(val < 0) val += M;}
modint pow(ll k){
modint res(1), x(val);
while(k){
if(k&1) res *= x;
x *= x;
k >>= 1;
}
return res;
}
template<typename T>
modint& operator=(T a){ val = a%M; if(val < 0) val += M; return *this; }
modint inv() {return pow(M-2);}
modint& operator+=(modint a){ val += a.val; if(val >= M) val -= M; return *this;}
modint& operator-=(modint a){ val += M-a.val; if(val >= M) val -= M; return *this;}
modint& operator*=(modint a){ val = 1LL*val*a.val%M; return *this;}
modint& operator/=(modint a){ return (*this) *= a.inv();}
modint operator+(modint a) const {return modint(val) +=a;}
modint operator-(modint a) const {return modint(val) -=a;}
modint operator*(modint a) const {return modint(val) *=a;}
modint operator/(modint a) const {return modint(val) /=a;}
modint operator-(){ return modint(-val);}
bool operator==(const modint a) const {return val == a.val;}
bool operator!=(const modint a) const {return val != a.val;}
bool operator<(const modint a) const {return val < a.val;}
};
using mint = modint<MOD>;
int main() {
string s;
cin >> s;
rolling_hash_u64 h(s);
int n = s.size(), m = n/2;
vector<mint> dp(m+1);
dp[0] = 1;
for (int i = 0; i < m; ++i) {
for (int j = 0; j <= i; ++j) {
if(h.get(j, i+1) == h.get(n-i-1, n-j)) {
dp[i+1] += dp[j];
}
}
}
cout << accumulate(dp.begin(),dp.end(), mint(0)).val << "\n";
return 0;
}