oj.uz

Submission #584260

# Submission time Handle Problem Language Result Execution time Memory
584260 2022-06-27T06:07:10 Z talant117408 Necklace (Subtask 1-3) (BOI19_necklace1) C++17
85 / 85
 363 ms 71036 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++) {
        fill(all(reversed_Z[i]), 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;
            }
        }
    }
    
    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 7 ms 1492 KB Output is correct
7 Correct 6 ms 1492 KB Output is correct
8 Correct 6 ms 1364 KB Output is correct
9 Correct 6 ms 1492 KB Output is correct
10 Correct 7 ms 1492 KB Output is correct
11 Correct 6 ms 1492 KB Output is correct
12 Correct 6 ms 1492 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 7 ms 1492 KB Output is correct
7 Correct 6 ms 1492 KB Output is correct
8 Correct 6 ms 1364 KB Output is correct
9 Correct 6 ms 1492 KB Output is correct
10 Correct 7 ms 1492 KB Output is correct
11 Correct 6 ms 1492 KB Output is correct
12 Correct 6 ms 1492 KB Output is correct
13 Correct 361 ms 71036 KB Output is correct
14 Correct 321 ms 71032 KB Output is correct
15 Correct 363 ms 66884 KB Output is correct
16 Correct 336 ms 69860 KB Output is correct
17 Correct 309 ms 68480 KB Output is correct
18 Correct 311 ms 70460 KB Output is correct
19 Correct 320 ms 70356 KB Output is correct
20 Correct 335 ms 68428 KB Output is correct
21 Correct 336 ms 69160 KB Output is correct