sum二维数组扁平为一维数组
leetcode LCP39 无人机方阵 python代码解法技术群有小伙伴不理解，自己探索解读下from typing import Listfrom collections import Counterclass Solution: def minimumSwitchingTimes(self, source: List[List[int]], target: List[List[int]]) -> int: source, target = Counter
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