제출 #624800

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
624800		Alma	Palindromic Partitions (CEOI17_palindromic)	C++17	0 / 100	0 ms	212 KiB

palindromic

#include <bits/stdc++.h>
using namespace std;

#define fi first
#define se second
using ll = long long;
using ii = pair<int,int>;

const int INF = 1e9;
const ll LLINF = 1e18;
using vi = vector<int>;
using vvi = vector<vi>;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(NULL);

    int tc;
	cin >> tc;

	while (tc--) {
		string s;
		cin >> s;
		int n = s.size();

		ll B = 239, M = 1e9+7;
		vector<ll> p(n+1), hs(n+1);
		p[0] = 1; hs[0] = 0;
		
		for (int i = 0; i < n; i++) {
			p[i+1] = (p[i] * B) % M;
			hs[i+1] = (hs[i] * B + s[i]) % M;
		}

		int l = 0, r = n, ans = 0;
		while (l < r) {
			int k = 1;
			while (hs[l+k] - (hs[l] * p[k]) % M != hs[r] - (hs[r-k] * p[k]) % M) {
				k++;
			}
			if (r-l == k) {
				ans++;
				break;
			}
			else ans += 2;
			l += k;
			r -= k;
		}

		cout << ans << '\n';
	}

    return 0;
}

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