Submission #1087943

#	Time	Username	Problem	Language	Result	Execution time	Memory
1087943		SulA	Xor Sort (eJOI20_xorsort)	C++17	0 / 100	1 ms	348 KiB

xorsort

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define bitcount __builtin_popcountll
using namespace std;
using namespace __gnu_pbds;
using namespace chrono;

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr), cout.tie(nullptr);

    int n; cin >> n;
    int a[n]; for (int i = 0; i < n; cin >> a[i++]);
    auto oper = [&](int& x, int& y) {
        x ^= y;
    };

    vector<pair<int,int>> operations;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) if (a[i] > a[j]) {
            oper(a[i], a[j]);
            oper(a[j], a[i]);
            oper(a[i], a[j]);
            operations.emplace_back(i, j);
            operations.emplace_back(j, i);
            operations.emplace_back(i, j);
        }
    }
    cout << operations.size() << "\n";
    for (auto [i, j] : operations) cout << i+1 << " " << j+1 << '\n';
}

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