Now or Never
翅膀长在你的肩上,太在乎别人对于飞行姿势的批评,所以你飞不起来。 —— 卡森.麦卡勒斯
Map:
若干个人一起去图书馆数书,A 数第一排, B数第二排, 人越多, 数的越快。
Reduce:
将所有人的统计结果进行分类汇总。
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