Java > Warmup-2 > has271 (CodingBat Solution)

Problem:

Given an array of ints, return true if it contains a 2, 7, 1 pattern -- a value, followed by the value plus 5, followed by the value minus 1. Additionally the 271 counts even if the "1" differs by 2 or less from the correct value.

has271({1, 2, 7, 1}) → true
has271({1, 2, 8, 1}) → false
has271({2, 7, 1}) → true

Solution:

public boolean has271(int[] nums) {
  int len = nums.length;

  for (int i = 0; i < nums.length - 1; i++) {   
    if (i+2 <= nums.length - 1){
      int j = Math.abs(nums[i] - 1);  
      int k = Math.abs(j - nums[i+2]);         
      if(nums[i+1] == nums[i]+5 && k <= 2)
        return true;      
    }    
          
  } return false;
}