Submission #106849

#	Time	Username	Problem	Language	Result	Execution time	Memory
106849		Frankenween	Palindromic Partitions (CEOI17_palindromic)	C++17	0 / 100	3 ms	384 KiB

palindromic

#ifdef LOCAL
#define _GLIBCXX_DEBUG
#endif
#include <bits/stdc++.h>

#define ull unsigned long long
#define pll pair<ll, ll>
#define mp make_pair
#define ll long long
#define pb push_back
#define deb(x) cout << #x << " = " << x << endl
#define all(x) x.begin(), x.end()
#define ld long double
const ll mod = (ll)1e9 + 7;
const ll BASE = 47;
const ll inf = (ll)1e18;
const long double e = 2.718281828459;
const long double pi = 3.141592653;
const ld EPS = 1e-9;


using namespace std;


template <class T>
istream& operator>>(istream &in, vector<T> &arr) {
    for (T &cnt : arr) {
        in >> cnt;
    }
    return in;
};


void solve() {
    string s;
    cin >> s;
    ll n = s.size();
    ll cnt_pow = 1;
    ll h1 = 0, h2 = 0;
    ll answer = 0;
    for (int i = 0; i < n / 2; i++) {
        h1 += (ll)(s[i] - 'a' + 1) * cnt_pow;
        h2 *= BASE;
        h1 %= mod;
        h2 += s[n - i - 1] - 'a' + 1;
        h2 %= mod;
        cnt_pow *= BASE;
        cnt_pow %= mod;
        if (h1 == h2) {
            answer += 2;
            h1 = 0;
            h2 = 0;
            cnt_pow = 1;
        }
        if (i + 1 == n / 2) {
            if (h1 != h2 or n % 2 == 1) {
                answer++;
            }
        }
    }

    cout << answer << "\n";
}


int main() {
#ifndef LOCAL
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
#else
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    cout.precision(30);
    ll seed = time(0);
    //cerr << "Seed: " << seed << "\n";
    srand(seed);
    ll t;
    cin >> t;
    while (t--)
        solve();
    return 0;
}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 20
• Subtask 3: 0 / 25
• Subtask 4: 0 / 40