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Submission #107948

# Submission time Handle Problem Language Result Execution time Memory
107948 2019-04-26T10:01:54 Z SamAnd Palindromes (APIO14_palindrome) C++17
23 / 100
 746 ms 132096 KB 
#include <bits/stdc++.h>
using namespace std;
const int N = 10004;
const long long P = 31;

int n;
char aa[N], a[N];

long long ast[N];
long long p[N], s[N];

bool pal(int l, int r)
{
    return (p[r] - p[l - 1]) * ast[n - r] == (s[l] - s[r + 1]) * ast[l - 1];
}

int z;
int t[N * 100][26];
int b[N * 100];

int main()
{
    cin >> aa;
    n = strlen(aa);
    for (int i = 1; i <= n; ++i)
        a[i] = aa[i - 1];

    ast[0] = 1;
    for (int i = 1; i <= n; ++i)
        ast[i] = ast[i - 1] * P;

    for (int i = 1; i <= n; ++i)
        p[i] = p[i - 1] + ast[i - 1] * (a[i] - 'a' + 1);
    for (int i = n; i >= 1; --i)
        s[i] = s[i + 1] + ast[n - i] * (a[i] - 'a' + 1);

    for (int l = 1; l <= n; ++l)
    {
        int pos = 0;
        for (int r = l; r <= n; ++r)
        {
            if (t[pos][a[r] - 'a'] == 0)
                t[pos][a[r] - 'a'] = ++z;
            pos = t[pos][a[r] - 'a'];
            b[pos]++;
        }
    }

    int ans = 0;
    for (int l = 1; l <= n; ++l)
    {
        int pos = 0;
        for (int r = l; r <= n; ++r)
        {
            pos = t[pos][a[r] - 'a'];
            if (pal(l, r))
                ans = max(ans, b[pos] * (r - l + 1));
        }
    }

    cout << ans << endl;
    return 0;
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 3 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 3 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 3 ms 384 KB Output is correct
16 Correct 3 ms 384 KB Output is correct
17 Correct 5 ms 384 KB Output is correct
18 Correct 2 ms 384 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 3 ms 384 KB Output is correct
21 Correct 4 ms 768 KB Output is correct
22 Correct 3 ms 768 KB Output is correct
23 Correct 3 ms 384 KB Output is correct
24 Correct 2 ms 640 KB Output is correct
25 Correct 0 ms 384 KB Output is correct
26 Correct 2 ms 768 KB Output is correct
27 Correct 2 ms 768 KB Output is correct
28 Correct 3 ms 640 KB Output is correct
29 Correct 3 ms 812 KB Output is correct
30 Correct 4 ms 896 KB Output is correct
31 Correct 3 ms 896 KB Output is correct
32 Correct 3 ms 768 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 640 KB Output is correct
2 Correct 44 ms 28664 KB Output is correct
3 Correct 10 ms 512 KB Output is correct
4 Correct 64 ms 47352 KB Output is correct
5 Correct 13 ms 512 KB Output is correct
6 Correct 10 ms 512 KB Output is correct
7 Correct 89 ms 36088 KB Output is correct
8 Correct 10 ms 640 KB Output is correct
9 Correct 72 ms 49144 KB Output is correct
10 Correct 70 ms 52728 KB Output is correct
11 Correct 70 ms 52728 KB Output is correct
12 Correct 78 ms 40592 KB Output is correct

Subtask #3
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 746 ms 2736 KB Output is correct
2 Runtime error 398 ms 132096 KB Execution killed with signal 11 (could be triggered by violating memory limits)
3 Halted 0 ms 0 KB -

Subtask #4
0 / 26.0

# Verdict Execution time Memory Grader output
1 Runtime error 5 ms 640 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #5
0 / 27.0

# Verdict Execution time Memory Grader output
1 Runtime error 6 ms 512 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -