//Given an int array, return true if the array contains 2 twice, or 3 twice. The array will be length 0, 1, or 2.
//
//double23([2, 2]) → true
//double23([3, 3]) → true
//double23([2, 3]) → false

public boolean double23(int[] nums) {
  for (int i=0;i<nums.length-1;i++){
    if ((nums[i]==2 && nums[i+1]==2) ||(nums[i]==3 && nums[i+1]==3)) 
      return true;
  }
  return false;
}