oj.uz

Submission #1089525

# Submission time Handle Problem Language Result Execution time Memory
1089525 2024-09-16T15:51:35 Z Has2008 Xor Sort (eJOI20_xorsort) C++17
100 / 100
 64 ms 1500 KB 
#include "bits/stdc++.h"
using namespace std;

#define int long long
#define endl endl

const int mod = 1e9 + 7;
const int maxn = 1e6;

int n, s, arr[maxn];
vector < pair < int, int >> ans;
void s1()
{
    for (int i = n - 1; i >= 0; i--)
    {
        int p = -1;
        for (int j = 0; j <= i; j++)
        {
            if (p == -1 || arr[p] < arr[j]) p = j;
            if (j) ans.push_back({j - 1, j});
        }
        for (int j = p + 1; j <= i; j++) ans.push_back({j, j - 1});

        for (int j = p - 2; j >= 0; j--) ans.push_back({j, j + 1});

        for (int j = p; j + 1 < n; j++) swap(arr[j], arr[j + 1]);

    }
    for (int i = n - 2; i >= 0; --i) ans.push_back({i, i + 1});
}

void s2()
{
    for(int i = 19; i >= 0; i--)
    {
        for(int j = 0; j < n - 1; j++)
        {
            if(arr[j + 1] >= (1 << (i + 1))) break;
            if(!(arr[j] & (1 << i))) continue;
            if(!(arr[j + 1] & (1 << i))) ans.push_back({j + 1, j}), arr[j + 1] ^= arr[j];

            ans.push_back({j, j + 1});
            arr[j] ^= arr[j + 1];
        }
    }
}

void solve()
{
    cin >> n >> s;

    for(int i = 0; i < n; i++) cin >> arr[i];
    int arr2[n];


    if(s == 1) s1();
    else s2();

    cout << ans.size() << endl;
    for(auto [i, j] : ans) cout << i + 1 << " " << j + 1 << endl;

}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    int tt = 1;
    //cin >> tt;

    while(tt--) solve();
}

Compilation message

xorsort.cpp: In function 'void solve()':
xorsort.cpp:53:9: warning: unused variable 'arr2' [-Wunused-variable]
   53 |     int arr2[n];
      |         ^~~~

Subtask #1
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 468 KB Output is correct
3 Correct 3 ms 348 KB Output is correct
4 Correct 29 ms 988 KB Output is correct
5 Correct 31 ms 992 KB Output is correct
6 Correct 29 ms 988 KB Output is correct
7 Correct 24 ms 988 KB Output is correct
8 Correct 24 ms 992 KB Output is correct
9 Correct 23 ms 988 KB Output is correct
10 Correct 24 ms 992 KB Output is correct
11 Correct 24 ms 992 KB Output is correct
12 Correct 32 ms 988 KB Output is correct
13 Correct 24 ms 1056 KB Output is correct
14 Correct 24 ms 1056 KB Output is correct
15 Correct 24 ms 992 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 468 KB Output is correct
3 Correct 3 ms 348 KB Output is correct
4 Correct 29 ms 988 KB Output is correct
5 Correct 31 ms 992 KB Output is correct
6 Correct 29 ms 988 KB Output is correct
7 Correct 24 ms 988 KB Output is correct
8 Correct 24 ms 992 KB Output is correct
9 Correct 23 ms 988 KB Output is correct
10 Correct 24 ms 992 KB Output is correct
11 Correct 24 ms 992 KB Output is correct
12 Correct 32 ms 988 KB Output is correct
13 Correct 24 ms 1056 KB Output is correct
14 Correct 24 ms 1056 KB Output is correct
15 Correct 24 ms 992 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 24 ms 992 KB Output is correct
18 Correct 41 ms 1496 KB Output is correct
19 Correct 41 ms 1500 KB Output is correct
20 Correct 41 ms 1500 KB Output is correct
21 Correct 42 ms 1496 KB Output is correct
22 Correct 41 ms 1500 KB Output is correct
23 Correct 41 ms 1500 KB Output is correct
24 Correct 42 ms 1500 KB Output is correct
25 Correct 41 ms 1500 KB Output is correct
26 Correct 58 ms 1496 KB Output is correct
27 Correct 44 ms 1500 KB Output is correct
28 Correct 42 ms 1500 KB Output is correct
29 Correct 42 ms 1496 KB Output is correct
30 Correct 41 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 2 ms 348 KB Output is correct
4 Correct 6 ms 708 KB Output is correct
5 Correct 32 ms 1272 KB Output is correct
6 Correct 44 ms 1244 KB Output is correct
7 Correct 35 ms 1244 KB Output is correct
8 Correct 31 ms 1240 KB Output is correct
9 Correct 31 ms 1240 KB Output is correct
10 Correct 34 ms 1248 KB Output is correct
11 Correct 32 ms 1200 KB Output is correct
12 Correct 33 ms 1172 KB Output is correct
13 Correct 34 ms 1240 KB Output is correct
14 Correct 33 ms 1244 KB Output is correct
15 Correct 64 ms 1496 KB Output is correct