Activity Selection

//{ Driver Code Starts
#include<bits/stdc++.h>
using namespace std;


// } Driver Code Ends
class Solution
{
    public:
    //Function to find the maximum number of activities that can
    //be performed by a single person.
    static bool cmp(pair<int,int> a,pair<int,int> b)
    {
        return a.second<b.second;
    }
    int activitySelection(vector<int> start, vector<int> end, int n)
    {

        vector<pair<int,int>> v;
        for(int i=0;i<n;i++)
        {
            v.push_back({start[i],end[i]});
        }
        sort(v.begin(),v.end(),cmp);

        int prevend=v[0].second;
        int c=1;
        for(int i=1;i<n;i++)
        {
            if(v[i].first>prevend)
            {
                c++;
                prevend=v[i].second;
            }

        }
        return c;
    }
};

//{ Driver Code Starts.
int main()
{
    int t;

    //testcases
    cin >> t;
    while(t--)
    {
        //size of array
        int n;
        cin >> n;
        vector<int> start(n), end(n);

        //adding elements to arrays start and end
        for(int i=0;i<n;i++)
            cin>>start[i];
        for(int i=0;i<n;i++)
            cin>>end[i];
        Solution ob;
        //function call
        cout << ob.activitySelection(start, end, n) << endl;
    }
    return 0;
}

// } Driver Code Ends