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Submission #924937

# Submission time Handle Problem Language Result Execution time Memory
924937 2024-02-10T05:21:31 Z sleepntsheep Palindromic Partitions (CEOI17_palindromic) C++17
100 / 100
 1937 ms 58728 KB 
#include <bits/stdc++.h>

#define N 200005
#define ALL(x) begin(x), end(x)
using namespace std;

#define int long long

constexpr long long B { 31 }, M { 1000000007 };


int docase()
{
    string s;
    cin >> s;
    int n = s.size(), z {};
    s = "0" + s;
    vector<int> h(2*n+2, 0), pw(2*n+2, 1), ipw(2*n+2, 1);

    auto bpow = [&](auto &&bpow, long long a, long long b) -> long long {
        if (!b) return 1;
        auto r = bpow(bpow, a, b>>1);
        if (b&1) return r*r%M*a%M;
        return r*r%M;
    };

    for (auto &c : s) c -= 'a';

    for (int i = 1; i <= n; ++i)
        pw[i] = 1ll * pw[i-1] * B % M, ipw[i] = bpow(bpow, pw[i], M-2);

    for (int i = 1; i <= n; ++i)
        h[i] = (h[i-1] + ((long long)s[i] * pw[i] % M)) % M;


    auto sub = [&](int l, int r){
        auto base = (h[r] - h[l-1] + M) % M;
        (base *= ipw[l]) %= M;
        return base;
    };

    for (int l, i = 1, j = n; i <= j;)
    {
        l = 1;
        while (i+l-1 <= j and sub(i, i+l-1) != sub(j-l+1, j)) ++l;
        if (i+l-1 >= j){++z; break;}
        i+=l,j-=l,++z,++z;
    }

    cout << z << '\n';

    return 0;
}

signed main()
{
    cin.tie(0)->sync_with_stdio(0);
    int T;
    cin >> T;
    while (T--) docase();
    return 0;
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 600 KB Output is correct
5 Correct 0 ms 348 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 600 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 600 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 20 ms 1056 KB Output is correct
11 Correct 11 ms 1072 KB Output is correct
12 Correct 21 ms 984 KB Output is correct
13 Correct 18 ms 1232 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 600 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 20 ms 1056 KB Output is correct
11 Correct 11 ms 1072 KB Output is correct
12 Correct 21 ms 984 KB Output is correct
13 Correct 18 ms 1232 KB Output is correct
14 Correct 1937 ms 58728 KB Output is correct
15 Correct 1039 ms 53164 KB Output is correct
16 Correct 1847 ms 54648 KB Output is correct
17 Correct 1041 ms 32768 KB Output is correct