oj.uz

Submission #584258

# Submission time Handle Problem Language Result Execution time Memory
584258 2022-06-27T06:03:43 Z talant117408 Necklace (Subtask 1-3) (BOI19_necklace1) C++17
85 / 85
 380 ms 71032 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
 
#define pb                  push_back
#define mp                  make_pair
#define all(v)              (v).begin(),(v).end()
#define rall(v)             (v).rbegin(),(v).rend()
#define lb                  lower_bound
#define ub                  upper_bound
#define sz(v)               int((v).size())
#define do_not_disturb      ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define endl                '\n'

vector <int> z_function(string s) {
    int n = sz(s);
    vector <int> z(n);
    for (int i = 1, l = 0, r = 0; i < n; i++) {
        if (i <= r)
            z[i] = min (r - i + 1, z[i - l]);
        while (i + z[i] < n && s[z[i]] == s[i + z[i]])
            z[i]++;
        if (i + z[i] - 1 > r)
            l = i, r = i + z[i] - 1;
    }
    return z;
}

void solve() {
    string s, t;
    cin >> s >> t;
    int ans = 0, inds = -1, indt = -1;
    vector <vector <int>> Z(sz(s), vector <int> (sz(t))), reversed_Z(sz(s), vector <int> (sz(t)));
    
    string q = s;
    for (int i = 0; i < sz(s); i++) {
        string tmp = q + '$' + t;
        auto res = z_function(tmp);
        for (int j = sz(s) + 1; j < sz(s) + sz(t) + 1; j++) Z[i][j - sz(s) - 1] = res[j];
        rotate(q.begin(), q.begin() + 1, q.end());
        q.back() = '#';
    }
    for (int i = 0; i < sz(s); i++) {
        for (int j = 0; j < sz(t); j++) {
            auto r = (j + Z[i][j]) % sz(t);
            if (j + Z[i][j] < sz(t))
                reversed_Z[i][r] = max(reversed_Z[i][r], Z[i][j]);
        }
    }
    for (int i = 0; i < sz(s); i++) {
        for (int j = 0; j < sz(t); j++) {
            if (Z[i][j] == 0) continue;
            int nxt = (i + Z[i][j]) % sz(s);
            if (Z[i][j] + reversed_Z[nxt][j] > ans && Z[i][j] + reversed_Z[nxt][j] <= sz(s)) {
                ans = Z[i][j] + reversed_Z[nxt][j];
                inds = i; indt = (j - reversed_Z[nxt][j] + sz(t)) % sz(t);
                //~ indt = sz(t) - (indt + ans - 1) - 1;
            }
        }
    }
    q = s;
    reverse(all(t));
    for (int i = 0; i < sz(s); i++) {
        for (auto &to : reversed_Z[i]) to = 0;
        string tmp = q + '$' + t;
        auto res = z_function(tmp);
        for (int j = sz(s) + 1; j < sz(s) + sz(t) + 1; j++) Z[i][j - sz(s) - 1] = res[j];
        rotate(q.begin(), q.begin() + 1, q.end());
        q.back() = '#';
    }
    for (int i = 0; i < sz(s); i++) {
        for (int j = 0; j < sz(t); j++) {
            auto r = (j + Z[i][j]) % sz(t);
            if (j + Z[i][j] < sz(t))
                reversed_Z[i][r] = max(reversed_Z[i][r], Z[i][j]);
        }
    }
    for (int i = 0; i < sz(s); i++) {
        for (int j = 0; j < sz(t); j++) {
            if (Z[i][j] == 0) continue;
            int nxt = (i + Z[i][j]) % sz(s);
            if (Z[i][j] + reversed_Z[nxt][j] > ans && Z[i][j] + reversed_Z[nxt][j] <= sz(s)) {
                ans = Z[i][j] + reversed_Z[nxt][j];
                inds = i; indt = (j - reversed_Z[nxt][j] + sz(t)) % sz(t);
                indt = sz(t) - (indt + ans - 1) - 1;
            }
        }
    }
                //~ inds = i; indt = sz(t) - ((j - reversed_Z[nxt][j] + sz(t)) % sz(t) + ans - 1) - 1;
    
    cout << ans << endl;
    cout << inds << ' ' << indt << endl;
}

int main() {
    //~ do_not_disturb
    
    int t = 1;
    //~ cin >> t;
    while (t--) {
        solve();
    }
    
    return 0;
}

Subtask #1
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 8 ms 1584 KB Output is correct
7 Correct 7 ms 1588 KB Output is correct
8 Correct 6 ms 1364 KB Output is correct
9 Correct 6 ms 1492 KB Output is correct
10 Correct 6 ms 1492 KB Output is correct
11 Correct 6 ms 1492 KB Output is correct
12 Correct 6 ms 1488 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 8 ms 1584 KB Output is correct
7 Correct 7 ms 1588 KB Output is correct
8 Correct 6 ms 1364 KB Output is correct
9 Correct 6 ms 1492 KB Output is correct
10 Correct 6 ms 1492 KB Output is correct
11 Correct 6 ms 1492 KB Output is correct
12 Correct 6 ms 1488 KB Output is correct
13 Correct 380 ms 71016 KB Output is correct
14 Correct 339 ms 71032 KB Output is correct
15 Correct 358 ms 66880 KB Output is correct
16 Correct 354 ms 69848 KB Output is correct
17 Correct 281 ms 68476 KB Output is correct
18 Correct 310 ms 70496 KB Output is correct
19 Correct 328 ms 70224 KB Output is correct
20 Correct 328 ms 68416 KB Output is correct
21 Correct 334 ms 69168 KB Output is correct