Optimal sort

#include <bits/stdc++.h>
#include <vector>

using namespace std;

int minSwaps(vector<int> arr)
{
    int n = arr.size();

    pair<int, int> arrPos[n];
    for (int i = 0; i < n; i++) {
        arrPos[i].first = arr[i];
        arrPos[i].second = i;
    }

    sort(arrPos, arrPos + n);

    vector<bool> vis(n, false);

    int ans = 0;

    for (int i = 0; i < n; i++) {

        if (vis[i] || arrPos[i].second == i)
            continue;


        int cycle_size = 0;
        int j = i;
        while (!vis[j]) {
            vis[j] = 1;

            j = arrPos[j].second;
            cycle_size++;
        }

        if (cycle_size > 0) {
            ans += (cycle_size - 1);
        }
    }

    return ans;
}

int main()
{
    int a;
    cin >> a;
    vector<int> arr(a);
    for(int i=0;i<a;i++)cin>>arr[i];
    cout << minSwaps(arr)<<endl;
}

Test 1

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