Submission #1087953

#	Time	Username	Problem	Language	Result	Execution time	Memory
1087953		SulA	Xor Sort (eJOI20_xorsort)	C++17	25 / 100	75 ms	12636 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,s; cin >> n >> s;
    int a[n]; for (int i = 0; i < n; cin >> a[i++]);
    vector<pair<int,int>> operations;
    auto oper = [&](int& x, int& y) {
        x ^= y;
    };
    auto swap = [&](int i, int 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);

    };

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

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