oj.uz

Submission #1092366

# Submission time Handle Problem Language Result Execution time Memory
1092366 2024-09-23T22:46:00 Z efishel Xor Sort (eJOI20_xorsort) C++17
100 / 100
 5 ms 1496 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vll = vector <ll>;
using ii = pair <ll, ll>;
using vii = vector <ii>;
 
const ll MAXN = 1E3+16;
ll th[MAXN];
vii ans;
vll ve;
void fop (ll i, ll j) {
    ans.push_back({ i, j });
    ve[i] ^= ve[j];
}
 
int main () {
    cin.tie(nullptr) -> sync_with_stdio(false);
    ll n, s;
    cin >> n >> s;
    if (s == 2) {
        ve = vll(n);
        for (ll &i : ve) cin >> i;
        ll nend = n;
        for (ll bit = 19; bit >= 0; bit--) {
            vll th = ve;
            for (ll &i : th) i = i>>bit&1;
            ll j = find(th.begin(), th.begin()+nend, 1) - th.begin();
            for (ll i = j+1; i < nend; i++) {
                if (th[i]) continue;
                fop(i, i-1);
            }
            for (ll i = j+1; i < nend; i++) {
                fop(i-1, i);
            }
            if (j != nend) nend--;
        }
        cout << ans.size() << '\n';
        for (auto [i, j] : ans) cout << i+1 << ' ' << j+1 << '\n';
        return 0;
    }
    vll ve(n);
    for (ll &i : ve) cin >> i;
    ::ve = ve;
    for (ll in = n; in >= 1; in--) {
        for (ll i = 0; i < in-1; i++) {
            fop(i, i+1);
        }
        ll j = max_element(ve.begin(), ve.begin()+in) - ve.begin();
        for (ll i = j+1; i < in; i++) {
            fop(i, i-1);
        }
        for (ll i = j-2; i >= 0; i--) {
            fop(i, i+1);
        }
        ve.erase(ve.begin()+j);
    }
    for (ll i = n-2; i >= 0; i--) {
        fop(i, i+1);
    }
    cout << ans.size() << '\n';
    for (auto [i, j] : ans) cout << i+1 << ' ' << j+1 << '\n';
    return 0;
}

Subtask #1
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 600 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 3 ms 988 KB Output is correct
5 Correct 3 ms 1052 KB Output is correct
6 Correct 3 ms 988 KB Output is correct
7 Correct 4 ms 988 KB Output is correct
8 Correct 3 ms 988 KB Output is correct
9 Correct 3 ms 988 KB Output is correct
10 Correct 5 ms 988 KB Output is correct
11 Correct 3 ms 988 KB Output is correct
12 Correct 3 ms 988 KB Output is correct
13 Correct 3 ms 1080 KB Output is correct
14 Correct 3 ms 988 KB Output is correct
15 Correct 3 ms 988 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 600 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 3 ms 988 KB Output is correct
5 Correct 3 ms 1052 KB Output is correct
6 Correct 3 ms 988 KB Output is correct
7 Correct 4 ms 988 KB Output is correct
8 Correct 3 ms 988 KB Output is correct
9 Correct 3 ms 988 KB Output is correct
10 Correct 5 ms 988 KB Output is correct
11 Correct 3 ms 988 KB Output is correct
12 Correct 3 ms 988 KB Output is correct
13 Correct 3 ms 1080 KB Output is correct
14 Correct 3 ms 988 KB Output is correct
15 Correct 3 ms 988 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 3 ms 988 KB Output is correct
18 Correct 5 ms 1496 KB Output is correct
19 Correct 5 ms 1496 KB Output is correct
20 Correct 4 ms 1492 KB Output is correct
21 Correct 4 ms 1496 KB Output is correct
22 Correct 5 ms 1496 KB Output is correct
23 Correct 4 ms 1496 KB Output is correct
24 Correct 5 ms 1492 KB Output is correct
25 Correct 5 ms 1496 KB Output is correct
26 Correct 5 ms 1496 KB Output is correct
27 Correct 5 ms 1496 KB Output is correct
28 Correct 4 ms 1496 KB Output is correct
29 Correct 5 ms 1496 KB Output is correct
30 Correct 5 ms 1496 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 604 KB Output is correct
5 Correct 3 ms 1240 KB Output is correct
6 Correct 3 ms 1240 KB Output is correct
7 Correct 4 ms 1236 KB Output is correct
8 Correct 3 ms 1240 KB Output is correct
9 Correct 3 ms 1492 KB Output is correct
10 Correct 3 ms 1100 KB Output is correct
11 Correct 4 ms 1236 KB Output is correct
12 Correct 4 ms 1240 KB Output is correct
13 Correct 4 ms 1292 KB Output is correct
14 Correct 5 ms 1236 KB Output is correct
15 Correct 5 ms 1496 KB Output is correct