leetcode1365

 1 class Solution:
 2     def smallerNumbersThanCurrent(self, nums: List[int]) -> List[int]:
 3         sorted_nums = sorted(nums)
 4         n = len(nums)
 5         index = 0
 6         dic = {}
 7         for i in range(n):
 8             cur = sorted_nums[i]
 9             if cur not in dic:
10                 dic[cur] = index
11             index += 1
12         result = []
13         for i in range(n):
14             cur = nums[i]
15             result.append(dic[cur])
16         return result

算法思路：hash