280. Wiggle Sort
Problem:
Given an unsorted array nums, reorder it in-place such that nums[0] <= nums[1] >= nums[2] <= nums[3]....
For example, given nums = [3, 5, 2, 1, 6, 4], one possible answer is [1, 6, 2, 5, 3, 4].
Solutions:
public class Solution {
public void wiggleSort(int[] nums) {
Arrays.sort(nums);
for (int i = 2; i< nums.length;) {
int tmp = nums[i];
nums[i] = nums[i -1];
nums[i - 1] = tmp;
i = i + 2;
}
}
}
public class Solution {
public void wiggleSort(int[] nums) {
for (int i = 1; i < nums.length; i ++) {
if ((i % 2 != 0 && nums[i] < nums[i - 1]) || (i % 2 == 0 && nums[i] > nums[i - 1])) {
int tmp = nums[i];
nums[i] = nums[i - 1];
nums[i - 1] = tmp;
}
}
}
}