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题解 简单常规题目 class Solution: def busyStudent(self, startTime: List[int], endTime: List[int], queryTime: int) -> int: num = 0 for i in range(len(endTime)): if endTime[i]>= queryTime and startTime[i]<= queryTime:

题解 常规简单题目 class Solution: def xorOperation(self, n: int, start: int) -> int: result = 0 for i in range(n): result = result ^ (start + 2*i) return result