oj.uz

Submission #645923

# Submission time Handle Problem Language Result Execution time Memory
645923 2022-09-28T09:46:02 Z alextodoran Necklace (Subtask 1-3) (BOI19_necklace1) C++17
85 / 85
 497 ms 98552 KB 
/**
 ____ ____ ____ ____ ____
||a |||t |||o |||d |||o ||
||__|||__|||__|||__|||__||
|/__\|/__\|/__\|/__\|/__\|

**/

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int L_MAX = 3000;

string a, b;
int n, m;

int lcp[L_MAX + 2][L_MAX + 2];

int kmp[L_MAX + 2][L_MAX + 2];
int lce[L_MAX + 2][L_MAX + 2];

vector <int> solve () {
    for (int i = n - 1; i >= 0; i--) {
        for (int j = m - 1; j >= 0; j--) {
            lcp[i][j] = (a[i] == b[j] ? lcp[i + 1][j + 1] + 1 : 0);
        }
    }
    for (int i = 0; i < n; i++) {
        kmp[i][i] = 0;
        for (int j = i + 1; j < n; j++) {
            kmp[i][j] = kmp[i][j - 1];
            while (kmp[i][j] > 0 && a[i + kmp[i][j]] != a[j]) {
                kmp[i][j] = kmp[i][i + kmp[i][j] - 1];
            }
            if (a[i + kmp[i][j]] == a[j]) {
                kmp[i][j]++;
            }
        }
    }
    for (int i = 0; i < n; i++) {
        lce[i][0] = (a[i] == b[0] ? 1 : 0);
        for (int j = 1; j < m; j++) {
            lce[i][j] = lce[i][j - 1];
            while (lce[i][j] > 0 && a[i + lce[i][j]] != b[j]) {
                lce[i][j] = kmp[i][i + lce[i][j] - 1];
            }
            if (a[i + lce[i][j]] == b[j]) {
                lce[i][j]++;
            }
        }
    }
    vector <int> best = {0, 0, 0};
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            int x = lcp[i][j];
            int y = 0;
            if (i + x < n && j - 1 >= 0) {
                y = lce[i + x][j - 1];
            }
            vector <int> here = {x + y, i, j - y};
            if (here[0] > best[0]) {
                best = here;
            }
        }
    }
    return best;
}

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

    cin >> a >> b;
    n = (int) a.size(); m = (int) b.size();
    vector <int> best1 = solve();
    reverse(b.begin(), b.end());
    vector <int> best2 = solve();
    best2[2] = m - best2[2] - best2[0];
    if (best1[0] < best2[0]) {
        swap(best1, best2);
    }
    cout << best1[0] << "\n";
    cout << best1[1] << " " << best1[2] << "\n";

    return 0;
}

Subtask #1
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1620 KB Output is correct
2 Correct 1 ms 1620 KB Output is correct
3 Correct 1 ms 1236 KB Output is correct
4 Correct 1 ms 1620 KB Output is correct
5 Correct 2 ms 1492 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1620 KB Output is correct
2 Correct 1 ms 1620 KB Output is correct
3 Correct 1 ms 1236 KB Output is correct
4 Correct 1 ms 1620 KB Output is correct
5 Correct 2 ms 1492 KB Output is correct
6 Correct 11 ms 6724 KB Output is correct
7 Correct 10 ms 6604 KB Output is correct
8 Correct 9 ms 6300 KB Output is correct
9 Correct 11 ms 6356 KB Output is correct
10 Correct 10 ms 6660 KB Output is correct
11 Correct 10 ms 6624 KB Output is correct
12 Correct 12 ms 6356 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1620 KB Output is correct
2 Correct 1 ms 1620 KB Output is correct
3 Correct 1 ms 1236 KB Output is correct
4 Correct 1 ms 1620 KB Output is correct
5 Correct 2 ms 1492 KB Output is correct
6 Correct 11 ms 6724 KB Output is correct
7 Correct 10 ms 6604 KB Output is correct
8 Correct 9 ms 6300 KB Output is correct
9 Correct 11 ms 6356 KB Output is correct
10 Correct 10 ms 6660 KB Output is correct
11 Correct 10 ms 6624 KB Output is correct
12 Correct 12 ms 6356 KB Output is correct
13 Correct 483 ms 98432 KB Output is correct
14 Correct 450 ms 98552 KB Output is correct
15 Correct 493 ms 94608 KB Output is correct
16 Correct 471 ms 98076 KB Output is correct
17 Correct 420 ms 96464 KB Output is correct
18 Correct 431 ms 98056 KB Output is correct
19 Correct 456 ms 97900 KB Output is correct
20 Correct 497 ms 96460 KB Output is correct
21 Correct 491 ms 97016 KB Output is correct