Activity selection

#include<bits/stdc++.h>
using namespace std;
typedef struct
{
    int a;
    int s;
    int e;
}semi;
int main()
{
    int n,i,j;
    cin>>n;
    semi ara[n+1],ara1[n+1],temp;
    for(i=0;i<n;i++)cin>>ara[i].a>>ara[i].s>>ara[i].e;
    for(i=0;i<n;i++)
    {
        for(j=i+1;j<n;j++)
        {
            if(ara[i].e>ara[j].e)
            {
                temp=ara[i];
                ara[i]=ara[j];
                ara[j]=temp;
            }
        }
    }
    int cnt=1,point=0;
    j=1;
    ara1[0]=ara[0];
    for(i=1;i<n;i++)
    {
       if(ara[point].e<ara[i].s)
       {
           cnt++;
           point=i;
           ara1[j++]=ara[i];
       }
    }
    cout<<endl<<cnt<<endl;
    for(i=0;i<j;i++)cout<<endl<<ara1[i].a<<" "<<ara1[i].s<<" "<<ara1[i].e<<endl;
    return 0;
}