結果

問題 No.599 回文かい
ユーザー momoyuu
提出日時 2022-09-30 20:18:14
言語 C++23
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 626 ms / 4,000 ms
コード長 3,916 bytes
コンパイル時間 3,064 ms
コンパイル使用メモリ 253,912 KB
実行使用メモリ 6,820 KB
最終ジャッジ日時 2024-12-22 20:37:42
合計ジャッジ時間 5,394 ms
ジャッジサーバーID
(参考情報)
judge1 / judge5
このコードへのチャレンジ
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ファイルパターン 結果
other AC * 22
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ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
template<class t> using vc = vector<t>;
template<class t> using vvc = vc<vc<t>>;
using pi = pair<int,int>;
using pl = pair<ll,ll>;
using vi = vc<int>;
using vvi = vvc<int>;
using vl = vc<ll>;
using vvl = vvc<ll>;
#define rep(i,a,b) for (int i = (int)(a); i < (int)(b); i++)
#define irep(i,a,b) for (int i = (int)(a); i > (int)(b); i--)
#define all(a) a.begin(),a.end()
#define print(n) cout << n << '\n'
#define pritn(n) print(n)
#define printv(n,a) {copy(all(n),ostream_iterator<a>(cout," ")); cout<<"\n";}
#define printvv(n,a) {for(auto itr:n) printv(itr,a);}
#define rup(a,b) (a+b-1)/b
#define input(A,N) rep(i,0,N) cin>>A[i]
#define chmax(a,b) a = max(a,b)
#define chmin(a,b) a = min(a,b)
//const int mod = 998'244'353;
//const ll mod = 1'000'000'009;
//const ll mod = 67'280'421'310'721;
template< ll mod >
struct mint{
long long x;
mint(long long x=0):x((x%mod+mod)%mod){}
mint operator-() const{
return mint(-x);
}
mint& operator+=(const mint& a){
if((x+=a.x)>=mod)x-=mod;
return *this;
}
mint& operator-=(const mint& a){
if((x+=mod-a.x)>=mod)x-=mod;
return *this;
}
mint& operator*=(const mint& a){
(x *= a.x) %= mod;
return *this;
}
mint operator+(const mint& a) const{
mint res(*this);
return res+=a;
}
mint operator-(const mint& a) const{
mint res(*this);
return res-=a;
}
mint operator*(const mint& a) const{
mint res(*this);
return res*=a;
}
mint pow(long long n) const {
assert(0 <= n);
mint a = *this, r = 1;
while (n) {
if (n & 1) r *= a;
a *= a;
n >>= 1;
}
return r;
}
mint inv() const{
return pow(mod-2);
}
mint& operator/=(const mint& a){
return (*this)*=a.inv();
}
mint operator/(const mint& a) const {
mint res(*this);
return res/=a;
}
friend ostream& operator<<(ostream& os, const mint& m){
os << m.x;
return os;
}
bool operator==(const mint& a) const {
return x == a.x;
}
bool operator<(const mint& a) const{
return x < a.x;
}
};
//https://gist.github.com/privet-kitty/295ac9202b7abb3039b493f8238bf40f#file-modulus-random-base-pair64-txt
struct rhash{
int n;
ll mod,B;
vc<ll> sum;
vc<ll> powb;
rhash(string &s,ll mod,ll B):mod(mod),B(B){
n = s.size();
sum = vc<ll>(n+1,0);
powb = vc<ll>(n+1,1);
for(int i = 0;i<n;i++){
sum[i+1] = (sum[i]*B%mod+(s[i]-'0'))%mod;
powb[i+1] = (powb[i]*B)%mod;
}
}
ll get(int l,int r){
ll tmp = sum[r] - sum[l]*powb[r-l]%mod;
if(tmp<0) tmp += mod;
return tmp;
}
};
const ll m1 = 1'000'000'007;
mint<m1> dfs(int l,int r,vi&vis,vc<rhash>&hash,vc<mint<m1>>&dp){
if(r<=l) return mint<m1>(1);
if(vis[l])return dp[l];
int L = l,R = r;
while(L<R){
bool p = true;
rep(i,0,hash.size()){
if(hash[i].get(l,L+1)==hash[i].get(R,r+1)) continue;
p = false;
break;
}
if(p){
dp[l] += dfs(L+1,R-1,vis,hash,dp);
}
L++;R--;
}
vis[l] = 1;
return dp[l];
}
const ll m4 = 2147483587;
const ll b4 = 2147483583;
const ll b2 = 1009;
const ll b3 = 2009;
const ll m2 = 1000000007;
const ll m3 = 1000000009;
int main(){
cout << fixed << setprecision(15);
string s;
cin>>s;
int n = s.size();
vc<rhash> hash;
hash.push_back(rhash(s,m2,b2));
hash.push_back(rhash(s,m3,b3));
// hash.push_back(rhash(s,m4,b4));
vc<mint<m1>> dp(n,1);
vi vis(n,0);
print(dfs(0,n-1,vis,hash,dp));
//system("pause");
return 0;
}
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