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Submission #1099962

# Submission time Handle Problem Language Result Execution time Memory
1099962 2024-10-12T09:23:16 Z andrei_iorgulescu Necklace (Subtask 1-3) (BOI19_necklace1) C++14
17 / 85
 233 ms 496 KB 
#include <bits/stdc++.h>

using namespace std;

int n, m;
string aaa, bbb;
char a[3005], b[3005];

struct sol
{
    int lungime = 0, p1 = 0, p2 = 0;
};

int k;
char s[6005], revs[6005];
int kmp[6005], revkmp[6005];///kmp[i] = cel mai lung prefix al lui s care e sufix al lui s[1...i], de lungime strict sub i

void build_kmps()
{
    kmp[1] = 0;
    for (int i = 2; i <= k; i++)
    {
        kmp[i] = kmp[i - 1] + 1;
        while (kmp[i] != 0 and s[i] != s[kmp[i]])
            kmp[i] = kmp[kmp[i]];
    }
    revkmp[1] = 0;
    for (int i = 2; i <= k; i++)
    {
        revkmp[i] = revkmp[i - 1] + 1;
        while (revkmp[i] != 0 and revs[i] != revs[revkmp[i]])
            revkmp[i] = revkmp[revkmp[i]];
    }
}

sol solve()
{
    sol ans;
    ans.lungime = 0;
    for (int p1 = 1; p1 <= n + 1; p1++)
    {
        k = 0;
        for (int i = p1; i <= n; i++)
            s[++k] = a[i];
        s[++k] = '$';
        for (int i = 1; i <= m; i++)
            s[++k] = b[i];
        s[++k] = '%';
        for (int i = 1; i < p1; i++)
            s[++k] = a[i];
        for (int i = 1; i <= k; i++)
            revs[i] = s[k + 1 - i];
        build_kmps();
        for (int p2 = 1; p2 <= m + 1; p2++)
        {
            int l1 = kmp[n - p1 + p2 + 1];
            int l2 = revkmp[m - p2 + p1 + 1];
            sol cur;
            cur.lungime = l1 + l2;
            cur.p1 = p1 - l2;
            cur.p2 = p2 - l1;
            if (cur.lungime > ans.lungime)
                ans = cur;
        }
    }
    return ans;
}

int main()
{
    cin >> aaa >> bbb;
    n = aaa.size();
    m = bbb.size();
    for (int i = 1; i <= n; i++)
        a[i] = aaa[i - 1];
    for (int i = 1; i <= m; i++)
        b[i] = bbb[i - 1];
    sol sol1 = solve();
    reverse(b + 1, b + m + 1);
    sol sol2 = solve();
    sol2.p2 = m + 1 - (sol2.p2 + sol2.lungime - 1);
    if (sol2.lungime > sol1.lungime)
        swap(sol1, sol2);
    cout << sol1.lungime << '\n' << sol1.p1 - 1 << ' ' << sol1.p2 - 1;
    return 0;
}

Subtask #1
5.0 / 25.0

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

Subtask #2
4.0 / 20.0

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

Subtask #3
8.0 / 40.0

# Verdict Execution time Memory Grader output
1 Partially correct 1 ms 348 KB Output is partially correct
2 Partially correct 1 ms 348 KB Output is partially correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 4 ms 348 KB Output is correct
7 Correct 3 ms 348 KB Output is correct
8 Partially correct 4 ms 348 KB Output is partially correct
9 Correct 4 ms 348 KB Output is correct
10 Correct 5 ms 344 KB Output is correct
11 Correct 5 ms 348 KB Output is correct
12 Correct 5 ms 348 KB Output is correct
13 Partially correct 183 ms 348 KB Output is partially correct
14 Partially correct 167 ms 348 KB Output is partially correct
15 Partially correct 168 ms 344 KB Output is partially correct
16 Correct 160 ms 348 KB Output is correct
17 Correct 220 ms 348 KB Output is correct
18 Correct 233 ms 492 KB Output is correct
19 Correct 193 ms 496 KB Output is correct
20 Correct 174 ms 348 KB Output is correct
21 Correct 182 ms 344 KB Output is correct