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Submission #1099966

# Submission time Handle Problem Language Result Execution time Memory
1099966 2024-10-12T09:29:04 Z andrei_iorgulescu Necklace (Subtask 1-3) (BOI19_necklace1) C++14
85 / 85
 358 ms 500 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()
{
    memset(kmp, 0, sizeof(kmp));
    memset(revkmp, 0, sizeof(revkmp));
    kmp[1] = 0;
    for (int i = 2; i <= k; i++)
    {
        kmp[i] = kmp[i - 1];
        while (kmp[i] != 0 and s[i] != s[kmp[i] + 1])
            kmp[i] = kmp[kmp[i]];
        if (s[i] == s[kmp[i] + 1])
            kmp[i]++;
    }
    revkmp[1] = 0;
    for (int i = 2; i <= k; i++)
    {
        revkmp[i] = revkmp[i - 1];
        while (revkmp[i] != 0 and revs[i] != revs[revkmp[i] + 1])
            revkmp[i] = revkmp[revkmp[i]];
        if (revs[i] == revs[revkmp[i] + 1])
            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
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 7 ms 348 KB Output is correct
7 Correct 6 ms 492 KB Output is correct
8 Correct 7 ms 348 KB Output is correct
9 Correct 7 ms 492 KB Output is correct
10 Correct 5 ms 348 KB Output is correct
11 Correct 4 ms 348 KB Output is correct
12 Correct 6 ms 344 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 7 ms 348 KB Output is correct
7 Correct 6 ms 492 KB Output is correct
8 Correct 7 ms 348 KB Output is correct
9 Correct 7 ms 492 KB Output is correct
10 Correct 5 ms 348 KB Output is correct
11 Correct 4 ms 348 KB Output is correct
12 Correct 6 ms 344 KB Output is correct
13 Correct 310 ms 348 KB Output is correct
14 Correct 273 ms 344 KB Output is correct
15 Correct 358 ms 500 KB Output is correct
16 Correct 304 ms 344 KB Output is correct
17 Correct 203 ms 348 KB Output is correct
18 Correct 218 ms 348 KB Output is correct
19 Correct 276 ms 344 KB Output is correct
20 Correct 293 ms 344 KB Output is correct
21 Correct 306 ms 344 KB Output is correct