Submission #1312705

#	Time	Username	Problem	Language	Result	Execution time	Memory
1312705		syanvu	Xor Sort (eJOI20_xorsort)	C++20	0 / 100	1 ms	568 KiB

xorsort

#pragma optimize ("g",on)
#pragma GCC optimize ("inline")
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC optimize ("03")
#include <bits/stdc++.h>

#define pb push_back
#define SS ios_base::sync_with_stdio(0);cin.tie(nullptr);cout.tie(nullptr);
// #define int long long
#define all(v) v.begin(),v.end()
using namespace std;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());

const int N = 1e5 + 1, inf = 1e9, mod = 998244353;

void solve(){
    int n, s;
    cin >> n >> s;
    int a[n + 1];
    for(int i = 1; i <= n; i++){
        cin >> a[i];
    }
    /*
    a[i] ^ a[i + 1] a[i + 1]
    a[i] ^ a[i + 1] a[i]
    a[i + 1] a[i]
    */
    vector<pair<int, int>> v;
    while(v.size() <= 10000){
        if(is_sorted(a + 1, a + n + 1)) break;
        for(int j = 1; j < n; j++){
            if((a[j] ^ a[j + 1]) < a[j]){
                v.push_back({j, j + 1});
                a[j] ^= a[j + 1];
            }
            else{
                v.push_back({j + 1, j});
                a[j + 1] ^= a[j];
            }
        }
    }
    cout << v.size() << '\n';
    for(auto [i, j] : v){
        cout << i << ' ' << j << '\n';
    }
}

signed main(){
    SS
    // freopen("trains.in", "r", stdin);
    // freopen("trains.out", "w", stdout);

    int t = 1;
    // cin >> t;
    while(t--){
        solve();
    }
}

• Subtask 1: 0 / 25
• Subtask 2: 0 / 35
• Subtask 3: 0 / 40