oj.uz

Submission #942171

# Submission time Handle Problem Language Result Execution time Memory
942171 2024-03-10T10:29:46 Z vjudge1 Palindromic Partitions (CEOI17_palindromic) C++17
100 / 100
 110 ms 26272 KB 
#include <bits/stdc++.h>
#define endl "\n"
#define int long long

using namespace std;

int q, n, P = 47, cnt = 1;
const int N = 1000005, M = 1000000007;
int p[N], h[N];
string s;

bool check_equal(int a, int b, int l) {
  int ha = (h[a + l] - h[a] + M) % M;
  int hb = (h[b + l] - h[b] + M) % M;
  return ha * p[b - a] % M == hb;
}


signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin >> q;
    p[0] = 1;
    for (int i = 1; i < N; i++)
    {
        p[i] = p[i - 1] * P % M;
    }
    while(q--)
    {
        cin >> s;
        cnt = 1;
        n = s.size();
        h[0] = 0;
        for (int i = 1; i <= n; i++)
        {
            h[i] = (h[i-1] + (1LL * (s[i-1] - 'a' + 1) * p[i - 1] % M)) % M;
        }
        int l = 0, r = n, k = 1;
        while(l < r && l + k <= r - k)
        {
            if(check_equal(l, r - k, k))
            {
                cnt++;
                if (l + k != r-k)cnt++;
                l += k;
                r -= k;
                k = 1;
            }
            else k++;
        }
        cout << cnt << endl;
        memset(h, 0, sizeof(h));

    }
    return 0;
}



/*
 * Before implementing the problem:

	Do I understand the problem correctly?
	Which places are tricky? What do I need to remember to implement them correctly?
	Which place is the heaviest by implementation? Can I do it simpler?
	Which place is the slowest? Where do I need to be careful about constant factors and where I can choose slower but simpler implementation?
	----------------------------------
	If not AC:

	Did you remember to do everything to handle the tricky places you thought about before?
	Is the solution correct?
	Do I understand the problem correctly?
	----------------------------------
	If you have a test on which the solution gives wrong answer:

	Is the solution doing what it was supposed to do?
	Is the problem in the code or in the idea?
*/

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 16088 KB Output is correct
2 Correct 9 ms 16088 KB Output is correct
3 Correct 8 ms 15964 KB Output is correct
4 Correct 9 ms 16112 KB Output is correct
5 Correct 8 ms 15964 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 16088 KB Output is correct
2 Correct 9 ms 16088 KB Output is correct
3 Correct 8 ms 15964 KB Output is correct
4 Correct 9 ms 16112 KB Output is correct
5 Correct 8 ms 15964 KB Output is correct
6 Correct 9 ms 15964 KB Output is correct
7 Correct 8 ms 16068 KB Output is correct
8 Correct 9 ms 15960 KB Output is correct
9 Correct 9 ms 15964 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 16088 KB Output is correct
2 Correct 9 ms 16088 KB Output is correct
3 Correct 8 ms 15964 KB Output is correct
4 Correct 9 ms 16112 KB Output is correct
5 Correct 8 ms 15964 KB Output is correct
6 Correct 9 ms 15964 KB Output is correct
7 Correct 8 ms 16068 KB Output is correct
8 Correct 9 ms 15960 KB Output is correct
9 Correct 9 ms 15964 KB Output is correct
10 Correct 9 ms 16216 KB Output is correct
11 Correct 8 ms 16216 KB Output is correct
12 Correct 9 ms 16220 KB Output is correct
13 Correct 9 ms 16112 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 16088 KB Output is correct
2 Correct 9 ms 16088 KB Output is correct
3 Correct 8 ms 15964 KB Output is correct
4 Correct 9 ms 16112 KB Output is correct
5 Correct 8 ms 15964 KB Output is correct
6 Correct 9 ms 15964 KB Output is correct
7 Correct 8 ms 16068 KB Output is correct
8 Correct 9 ms 15960 KB Output is correct
9 Correct 9 ms 15964 KB Output is correct
10 Correct 9 ms 16216 KB Output is correct
11 Correct 8 ms 16216 KB Output is correct
12 Correct 9 ms 16220 KB Output is correct
13 Correct 9 ms 16112 KB Output is correct
14 Correct 110 ms 22400 KB Output is correct
15 Correct 63 ms 22412 KB Output is correct
16 Correct 102 ms 26272 KB Output is correct
17 Correct 61 ms 21844 KB Output is correct