oj.uz

Submission #1089058

# Submission time Handle Problem Language Result Execution time Memory
1089058 2024-09-15T21:27:44 Z vjudge1 Xor Sort (eJOI20_xorsort) C++17
100 / 100
 5 ms 1500 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define endl '\n'
#define speed cin.tie (0) -> sync_with_stdio (0);ios_base::sync_with_stdio(false);cin.tie(0);
const int maxn = 1005;
int n, s;
int a[maxn];
vector<pair<int, int>> ans;
void ptt(int x, int y)
{
    ans.push_back({x + 1, y + 1});
    a[x] ^= a[y];
}
void solve1()
{
    int b[n + 5];
    for(int i=0; i<n; i++) b[i] = a[i];
    
    for(int i=0; i<n-1; i++) ptt(i, i + 1);
    
    for(int i=n-1; i>=0; i--)
    {
        int cur = 0;
        for(int j=1; j<=i; j++) if (b[j] > b[cur]) cur = j;
        for(int j=cur+1; j<=i; j++) ptt(j, j - 1);
        for(int j=max(0ll, cur-1); j<i; j++) ptt(j, j + 1);
        
        for(int j=cur; j<i; j++) swap(b[j], b[j + 1]);
    }
    
    // for(int i=0; i<n; i++) cout<<b[i]<<" ";
    // cout<<endl;
}
void solve2()
{
    int l = n;
    for(int bt=19; bt>=0; bt--)
    {
        bool f = 0;
        for(int i=0; i<n; i++)
        {
            if (a[i] & (1 << bt))
            {
                f = 1;
                break;
            }
        }
        if (!f) continue;
        
        l--;
        for(int i=0; i<l; i++)
        {
            if (a[i] & (1 << bt) && !(a[i + 1] & (1 << bt)))
            {
                ptt(i + 1, i);
                ptt(i, i + 1);
            }
            else if (a[i] & (1 << bt) && a[i + 1] & (1 << bt)) ptt(i, i + 1);
        }
    }
}
void solve()
{
    cin>>n>>s;
    for(int i=0; i<n; i++) cin>>a[i];
    
    if (s == 1) solve1();
    else solve2();
    
    cout<<ans.size()<<endl;
    for(auto [i, j] : ans) cout<<i<<" "<<j<<endl;
}
signed main ()
{
    speed
    // freopen("feast.in", "r", stdin);
    // freopen("feast.out", "w", stdout);

    int _ = 1;
    // cin>>_;

    while(_--) solve();

    return 0;
}

Subtask #1
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 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 736 KB Output is correct
5 Correct 2 ms 736 KB Output is correct
6 Correct 2 ms 736 KB Output is correct
7 Correct 1 ms 736 KB Output is correct
8 Correct 2 ms 860 KB Output is correct
9 Correct 2 ms 736 KB Output is correct
10 Correct 3 ms 736 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 3 ms 992 KB Output is correct
13 Correct 3 ms 992 KB Output is correct
14 Correct 3 ms 992 KB Output is correct
15 Correct 3 ms 992 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 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 736 KB Output is correct
5 Correct 2 ms 736 KB Output is correct
6 Correct 2 ms 736 KB Output is correct
7 Correct 1 ms 736 KB Output is correct
8 Correct 2 ms 860 KB Output is correct
9 Correct 2 ms 736 KB Output is correct
10 Correct 3 ms 736 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 3 ms 992 KB Output is correct
13 Correct 3 ms 992 KB Output is correct
14 Correct 3 ms 992 KB Output is correct
15 Correct 3 ms 992 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 2 ms 736 KB Output is correct
18 Correct 3 ms 992 KB Output is correct
19 Correct 2 ms 992 KB Output is correct
20 Correct 3 ms 992 KB Output is correct
21 Correct 3 ms 992 KB Output is correct
22 Correct 3 ms 992 KB Output is correct
23 Correct 3 ms 992 KB Output is correct
24 Correct 2 ms 992 KB Output is correct
25 Correct 3 ms 988 KB Output is correct
26 Correct 5 ms 1500 KB Output is correct
27 Correct 5 ms 1500 KB Output is correct
28 Correct 5 ms 1500 KB Output is correct
29 Correct 5 ms 1500 KB Output is correct
30 Correct 5 ms 1500 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 4 ms 1244 KB Output is correct
6 Correct 4 ms 1244 KB Output is correct
7 Correct 4 ms 1244 KB Output is correct
8 Correct 4 ms 1240 KB Output is correct
9 Correct 3 ms 1244 KB Output is correct
10 Correct 3 ms 1244 KB Output is correct
11 Correct 4 ms 1244 KB Output is correct
12 Correct 4 ms 1244 KB Output is correct
13 Correct 4 ms 1244 KB Output is correct
14 Correct 4 ms 1244 KB Output is correct
15 Correct 5 ms 1500 KB Output is correct