public class Solution {
    public void wiggleSort(int[] nums) {
        int n = nums.length;
        if(n == 0) return ;
        int[] a = Arrays.copyOfRange(nums,0,n); 
        Arrays.sort(a);
        int k = 0 , p = (n-1)/2, q = n-1;
        boolean sign = true;
　　　　　//sign控制交替赋值
        while(k < n){
            if(sign) nums[k++]=a[p--];
            else nums[k++]=a[q--];
            sign = !sign;
        }
    }
}