Arrays2.java

import java.io.*;
import java.util.*;

public class Arrays2 {
   
    public int[] Revfill(int n) {
        int[] x = new int[n];
        for (int i=0; i<n; i++) {
            x[i] = n-i;
        }
        return x;
    }

    public int[] makeRandom(int n, int min, int max) {
        int[] ans = new int[n];
        Random r = new Random();
        for (int i=0; i<n; i++) {
            ans[i] = r.nextInt(max-min) + min; //inclusive min; exclusive max
        }
        return ans;
    }

    public int sum13(int[] a) {
        int ans = 0; 
        for (int i=0; i<a.length; i++) {
            if (a[i] == 13){
                i++;
	    }
	    else {
		ans+=a[i];
	    }
        }
        return ans;
    }

    public boolean modThree(int[] a) {
        int even = 0;
        int odd = 0;
        int i=0;

        while (i < a.length) {
            if (a[i] % 2 == 0) {
                even ++;
                odd = 0;
            }
            else {
                odd ++;
                even = 0;
            }
	    i++;
	    if (odd >= 3 || even >= 3)
                return true;
	}
	return false;
    }
}