Sorting 2d array by the first or the second element
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sophryu99 commented
>>> intervals = [[2,6],[8,10],[15,18],[1,3]]
intervals.sort(key=lambda pair: pair[0])
>>> intervals = [[1,3],[2,6],[8,10],[15,18]]
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>>> intervals = [[2,6],[8,10],[15,18],[1,3]]
intervals.sort(key=lambda pair: pair[0])
>>> intervals = [[1,3],[2,6],[8,10],[15,18]]