Sort function

#include<bits/stdc++.h>
using namespace std;

int main()
{
    int n;
    scanf("%d",&n);
    int a[n+5];
    for(int i=0;i<n;i++){
    	scanf("%d",&a[i]);
    }
    sort(a,a+n);     //sorts from starting 0 index to n-1
    sort(a+1,a+n+1); //sorts from starting 1 index to n
    sort(a+2,a+5);   //sorts from starting 2 index to 4
    return 0;
}