結果

問題 No.2204 Palindrome Splitting (No Rearrangement ver.)
ユーザー dyktr_06
提出日時 2023-02-03 22:07:20
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 172 ms / 2,000 ms
コード長 6,228 bytes
コンパイル時間 3,621 ms
コンパイル使用メモリ 256,324 KB
最終ジャッジ日時 2025-02-10 09:18:43
ジャッジサーバーID
(参考情報)
judge2 / judge3
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 33
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 <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define overload4(_1, _2, _3, _4, name, ...) name
#define rep1(n) for(int i = 0; i < (int)(n); ++i)
#define rep2(i, n) for(int i = 0; i < (int)(n); ++i)
#define rep3(i, a, b) for(int i = (a); i < (int)(b); ++i)
#define rep4(i, a, b, c) for(int i = (a); i < (int)(b); i += (c))
#define rep(...) overload4(__VA_ARGS__, rep4, rep3, rep2, rep1)(__VA_ARGS__)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; --i)
#define ALL(a) a.begin(), a.end()
#define Sort(a) sort(a.begin(), a.end())
#define RSort(a) sort(a.rbegin(), a.rend())
typedef long long int ll;
typedef unsigned long long ul;
typedef long double ld;
typedef vector<int> vi;
typedef vector<long long> vll;
typedef vector<char> vc;
typedef vector<string> vst;
typedef vector<double> vd;
typedef vector<long double> vld;
typedef pair<long long, long long> P;
template<class T> long long sum(const T& a){ return accumulate(a.begin(), a.end(), 0LL); }
template<class T> auto min(const T& a){ return *min_element(a.begin(), a.end()); }
template<class T> auto max(const T& a){ return *max_element(a.begin(), a.end()); }
const long long MINF = 0x7fffffffffff;
const long long INF = 0x1fffffffffffffff;
const long long MOD = 998244353;
const long double EPS = 1e-9;
const long double PI = acos(-1);
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
template<typename T1, typename T2> istream &operator>>(istream &is, pair<T1, T2> &p){ is >> p.first >> p.second; return is; }
template<typename T1, typename T2> ostream &operator<<(ostream &os, const pair<T1, T2> &p){ os << "(" << p.first << ", " << p.second << ")"; return
    os; }
template<typename T> istream &operator>>(istream &is, vector<T> &v){ for(T &in : v) is >> in; return is; }
template<typename T> ostream &operator<<(ostream &os, const vector<T> &v){ for(int i = 0; i < (int) v.size(); ++i){ os << v[i] << (i + 1 != (int) v
    .size() ? " " : ""); } return os; }
template <typename T, typename S> ostream &operator<<(ostream &os, const map<T, S> &mp){ for(auto &[key, val] : mp){ os << key << ":" << val << " ";
    } return os; }
template <typename T> ostream &operator<<(ostream &os, const set<T> &st){ auto itr = st.begin(); for(int i = 0; i < (int)st.size(); ++i){ os << *itr
    << (i + 1 != (int)st.size() ? " " : ""); itr++; } return os; }
template <typename T> ostream &operator<<(ostream &os, const multiset<T> &st){ auto itr = st.begin(); for(int i = 0; i < (int)st.size(); ++i){ os <<
    *itr << (i + 1 != (int)st.size() ? " " : ""); itr++; } return os; }
template <typename T> ostream &operator<<(ostream &os, queue<T> q){ while(q.size()){ os << q.front() << " "; q.pop(); } return os; }
template <typename T> ostream &operator<<(ostream &os, deque<T> q){ while(q.size()){ os << q.front() << " "; q.pop_front(); } return os; }
template <typename T> ostream &operator<<(ostream &os, stack<T> st){ while(st.size()){ os << st.top() << " "; st.pop(); } return os; }
template <class T, class Container, class Compare> ostream &operator<<(ostream &os, priority_queue<T, Container, Compare> pq){ while(pq.size()){ os
    << pq.top() << " "; pq.pop(); } return os; }
template<class T, class U> inline T vin(T& vec, U n) { vec.resize(n); for(int i = 0; i < (int) n; ++i) cin >> vec[i]; return vec; }
template<class T> inline void vout(T vec, string s = "\n"){ for(auto x : vec) cout << x << s; }
template<class... T> void in(T&... a){ (cin >> ... >> a); }
void out(){ cout << '\n'; }
template<class T, class... Ts> void out(const T& a, const Ts&... b){ cout << a; (cout << ... << (cout << ' ', b)); cout << '\n'; }
template<class T, class U> void inGraph(vector<vector<T>>& G, U n, U m, bool directed = false){ G.resize(n); for(int i = 0; i < m; ++i){ int a, b;
    cin >> a >> b; a--, b--; G[a].push_back(b); if(!directed) G[b].push_back(a); } }
struct RollingHash{
vector<unsigned long long> hashed, power;
static constexpr unsigned long long mod = (1uL << 61) - 1;
unsigned long long mul(unsigned long long a, unsigned long long b) const {
__int128_t t = (__int128_t) a * b;
t = (t >> 61) + (t & mod);
if(t >= mod) return t - mod;
return t;
}
RollingHash(const string &s, unsigned base = 10007){
int siz = (int) s.size();
hashed.assign(siz + 1, 0);
power.assign(siz + 1, 0);
power[0] = 1;
for(int i = 0; i < siz; i++){
power[i + 1] = mul(power[i], base);
hashed[i + 1] = mul(hashed[i], base) + s[i];
if(hashed[i + 1] >= mod) hashed[i + 1] -= mod;
}
}
unsigned long long get(int l, int r) const {
unsigned long long ret = hashed[r] + mod - mul(hashed[l], power[r - l]);
if(ret >= mod) ret -= mod;
return ret;
}
unsigned long long connect(unsigned long long h1, unsigned long long h2, int h2len) const {
unsigned long long ret = mul(h1, power[h2len]) + h2;
if(ret >= mod) ret -= mod;
return ret;
}
int LCP(const RollingHash &b, int l1, int r1, int l2, int r2){
int len = min(r1 - l1, r2 - l2);
int low = -1, high = len + 1;
while(high - low > 1){
int mid = (low + high) / 2;
if(get(l1, l1 + mid) == b.get(l2, l2 + mid)) low = mid;
else high = mid;
}
return low;
}
};
string s;
ll dp[5001];
void input(){
in(s);
}
void solve(){
ll n = s.size();
string t = s;
reverse(ALL(t));
s += t;
RollingHash rh(s);
vector<vll> check(n);
rep(i, n){
check[i].push_back(i + 1);
rep(j, i + 1, n){
ll len = j - i + 1;
if(rh.get(i, i + len / 2) == rh.get(2 * n - j - 1, 2 * n - j - 1 + len / 2)){
check[i].push_back(j + 1);
}
}
}
ll ans = 1;
dp[0] = n;
rep(i, n){
for(auto x : check[i]){
chmax(dp[x], min(dp[i], x - i));
}
}
out(dp[n]);
}
int main(){
ios::sync_with_stdio(false);
cin.tie(nullptr);
cout << fixed << setprecision(20);
input();
solve();
}
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