• 每两个相邻的数据 a是第奇数个 b是第偶数个 然后a个b
    class Solution {
      public int[] decompressRLElist(int[] nums) {
          int size = 0;
          for(int i = 0; i < nums.length; i+=2){
              size += nums[i];
          }
          int arr[] = new int[size];
          int index = 0;
          for(int i = 0; i < nums.length; i+=2){
              int a = nums[i], b = nums[i+1];
              for(int j = 0; j < a; j++){
                  arr[index++] = b;
              }
          }
          return arr;
      }
    }