冏哥的程式之旅

 

public class LeetCode1470 {
	/*
	 * Easy
	 * 1470. Shuffle the Array
	 * Given the array nums consisting of 2n elements in the form [x1,x2,...,xn,y1,y2,...,yn].
	 * Return the array in the form [x1,y1,x2,y2,...,xn,yn].
	 * 
	 * Example 1:
	 * Input: nums = [2,5,1,3,4,7], n = 3
	 * Output: [2,3,5,4,1,7] 
	 * Explanation: Since x1=2, x2=5, x3=1, y1=3, y2=4, y3=7 then the answer is [2,3,5,4,1,7].
	 * 
	 * Example 2:
	 * Input: nums = [1,2,3,4,4,3,2,1], n = 4
	 * Output: [1,4,2,3,3,2,4,1]
	 * 
	 * Example 3:
	 * Input: nums = [1,1,2,2], n = 2
	 * Output: [1,2,1,2]
	 */
    public static void main(String[] args) {
        int[] nums = {2,5,1,3,4,7};
        int n = 3;
        int[] res = shuffle(nums, n);
        for(int r : res) {
            System.out.print(r + ",");
        }

    }
	
    public static int[] shuffle(int[] nums, int n) {
        int[] res = new int[nums.length];
        for(int i = 0, j = n, k = 0; j < nums.length; j++, i++, k = k + 2){
        	res[k] = nums[i];
        	res[k + 1] = nums[j];
        }
        return res;
    }

}