题目

1365. How Many Numbers Are Smaller Than the Current Number

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解题方法

设立一个temp数组存放nums中元素的有序序列，遍历temp中的每个元素i，累计已经遍历过的数的个数countnum，如果当前元素i不在dic中就加进去，值设置为已经遍历过的数的个数countnum，这个遍历结束之后遍历nums查字典写个数即可。
时间复杂度：O(nlogn)
空间复杂度：O(n)

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代码

class Solution:
    def smallerNumbersThanCurrent(self, nums: List[int]) -> List[int]:
        temp = sorted(nums)
        countnum = 0
        dic = {}
        for i in temp:
            if i not in dic:
                dic[i] = countnum
            countnum += 1
        
        rat = []
        for i in range(len(nums)):
            rat.append(dic[nums[i]])
        
        return rat