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Delivery Man- TADELIVE

Problem Link

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

#define pb push_back
#define pi pair<int, int>
#define mp make_pair

bool sortByDescDiff(const pair<int, int> &p1, const pair<int, int> &p2)
{
    return p1.second > p2.second;
}

int main()
{
    int n, x, y;
    int a[100001], b[100001];
    long result = 0;

    // stores absolute difference between tip gained by a and b
    //first element in pair is order number and second is difference in tip
    vector<pi> v;

    cin >> n >> x >> y;

    for(int i = 0; i < n; i++)
    {
        cin >> a[i];
    }

    for(int i = 0; i < n; i++)
    {
        cin >> b[i];
    }

    for(int i = 0; i < n; i++)
    {
        int diff = abs(a[i] - b[i]);
        v.pb(mp(i, diff));
    }

    sort(v.begin(), v.end(), sortByDescDiff);

    int index = 0;
    for(index = 0; index < n; index++)
    {
        int tip = v[index].first;
        if(x > 0 && y > 0)
        {
            result += (a[tip] > b[tip]) ? a[tip] : b[tip];
            (a[tip] > b[tip]) ? x-- : y--;
        }
        else
            break;
    }

    if(x != 0)
    {
        while(index < n)
        {
            int tip = v[index].first;
            result += a[tip];
            index++;
        }
    }

    if(y != 0)
    {
        while(index < n)
        {
            int tip = v[index].first;
            result += b[tip];
            index++;
        }
    }

    cout << result << endl;
    return 0;
}

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