Question

Code with Java and no imports, Method sandwiched returns true if num is in the element before and after an element that is not equal to num

sandwiched([4,5,4,6,7,3], 4) returns true

sandwiched([2,1,2], 2) returns true

sandwiched([3,3,3], 3) returns false

sandwiched([4,5,6,4], 4) returns false

sandwiched([1,1,2,3,1,4,1], 1) returns true

@param nums Integer ArrayList

@param num integer

@return true if a single number is between elements equal to num

*/ public static boolean sandwiched(ArrayList nums, int num) {

return false;

}//end sandwiched

Answer 1

/**
 * sandwiched([4,5,4,6,7,3], 4) returns true
 * sandwiched([2,1,2], 2) returns true
 * sandwiched([3,3,3], 3) returns false
 * sandwiched([4,5,6,4], 4) returns false
 * sandwiched([1,1,2,3,1,4,1], 1) returns true
 *
 * @param nums Integer ArrayList
 * @param num  integer
 * @return true if a single number is between elements equal to num
 */
public static boolean sandwiched(ArrayList<Integer> nums, int num) {
    for (int i = 0; i < nums.size() - 2; i++) {
        if (nums.get(i) == num && nums.get(i + 1) != num && nums.get(i + 2) == num) {
            return true;
        }
    }
    return false;
}

import java.util.ArrayList;
import java.util.Arrays;

public class SandswitchedTest {

    /**
     * sandwiched([4,5,4,6,7,3], 4) returns true
     * sandwiched([2,1,2], 2) returns true
     * sandwiched([3,3,3], 3) returns false
     * sandwiched([4,5,6,4], 4) returns false
     * sandwiched([1,1,2,3,1,4,1], 1) returns true
     *
     * @param nums Integer ArrayList
     * @param num  integer
     * @return true if a single number is between elements equal to num
     */
    public static boolean sandwiched(ArrayList<Integer> nums, int num) {
        for (int i = 0; i < nums.size() - 2; i++) {
            if (nums.get(i) == num && nums.get(i + 1) != num && nums.get(i + 2) == num) {
                return true;
            }
        }
        return false;
    }

    public static void main(String[] args) {
        System.out.println(sandwiched(new ArrayList<>(Arrays.asList(4, 5, 4, 6, 7, 3)), 4));
        System.out.println(sandwiched(new ArrayList<>(Arrays.asList(2, 1, 2)), 2));
        System.out.println(sandwiched(new ArrayList<>(Arrays.asList(3, 3, 3)), 3));
        System.out.println(sandwiched(new ArrayList<>(Arrays.asList(4, 5, 6, 4)), 4));
        System.out.println(sandwiched(new ArrayList<>(Arrays.asList(1, 1, 2, 3, 1, 4, 1)), 1));
    }
}