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Submission #585593

# Submission time Handle Problem Language Result Execution time Memory
585593 2022-06-29T06:04:44 Z tengiz05 Palindromic Partitions (CEOI17_palindromic) C++17
100 / 100
 226 ms 12780 KB 
#include <bits/stdc++.h>

using i64 = long long;
using namespace std;

struct Hash {
    static constexpr int P = 1000000007, M = 29;
    int n;
    std::vector<int> a, pw;
    Hash(std::string s) : n(s.size()), a(n + 1), pw(n + 1, 1) {
        for (int i = 1; i <= n; i++)
            pw[i] = 1LL * pw[i - 1] * M % P;
        for (int i = 0; i < n; i++)
            a[i + 1] = (1LL * a[i] * M + (s[i] - 'a' + 1)) % P;
    }
    int get(int l, int r) {
        r++;
        int res = a[r] - 1LL * pw[r - l] * a[l] % P;
        if (res < 0)
            res += P;
        return res;
    }
};

void solve() {
    string s;
    cin >> s;
    
    int n = s.size();
    
    int ans = 0;
    
    int l = 0, r = n - 1;
    
    Hash h(s);
    
    for (int i = 0; i < n / 2; i++) {
        if (h.get(l, i) == h.get(n - i - 1, r)) {
            ans += 2;
            l = i + 1;
            r = n - i - 2;
        }
    }
    
    ans += l <= r;
    
    cout << ans << "\n";
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int t;
    cin >> t;
    
    while (t--) {
        solve();
    }
    
    return 0;
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 320 KB Output is correct
9 Correct 1 ms 212 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 320 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 2 ms 468 KB Output is correct
11 Correct 2 ms 468 KB Output is correct
12 Correct 3 ms 468 KB Output is correct
13 Correct 2 ms 468 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 320 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 2 ms 468 KB Output is correct
11 Correct 2 ms 468 KB Output is correct
12 Correct 3 ms 468 KB Output is correct
13 Correct 2 ms 468 KB Output is correct
14 Correct 226 ms 12780 KB Output is correct
15 Correct 133 ms 12716 KB Output is correct
16 Correct 215 ms 12396 KB Output is correct
17 Correct 126 ms 8332 KB Output is correct