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from Volume 1. Elementary Problem Solving :: Sorting/Searching
某个大 BOSS 的情人遍布世界各地。因此他有个情人表,表的每项以国家名开头,之后是情人名。给你这张表,要求统计他在各国情人的数量。
用 map 统计一下即可,还顺带完成排序功能。