题目链接

2670. 找出不同元素数目差数组 - 力扣（LeetCode）

解题思路

暴力破解

class Solution:def distinctDifferenceArray(self, nums: List[int]) -> List[int]:mapbefore = [1] * len(nums)tmp = [nums[0]]for i in range(1,len(nums)):if nums[i] not in tmp:tmp.append(nums[i])mapbefore[i] = mapbefore[i - 1] + 1else:mapbefore[i] = mapbefore[i - 1]print(mapbefore)mapafter = [0] * len(nums)tmp = []for i in range(len(nums) - 2, -1, -1):if nums[i + 1] not in tmp:tmp.append(nums[i + 1])mapafter[i] = mapafter[i + 1] + 1else:mapafter[i] = mapafter[i + 1]print(mapafter)result = []for i in range(0,len(nums)):result.append(mapbefore[i]-mapafter[i])return result

使用set（）

class Solution:def distinctDifferenceArray(self, nums: List[int]) -> List[int]:st = set()sufCnt = [0] * (len(nums) + 1)for i in range(len(nums) - 1, 0, -1):st.add(nums[i])sufCnt[i] = len(st)res = []st.clear()for i in range(len(nums)):st.add(nums[i])res.append(len(st) - sufCnt[i + 1])return res