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用例有些不标准，java要注意StringTokenizer

Posted by frady at 2020-06-16 14:43:32 on Problem 1860 
要使用StringTokenizer，
StringTokenizer stringtokenizer = new StringTokenizer(reader.readLine());
//        String[] str=reader.readLine().split(" ");

split会一直Runtime ERROR，这个坑，花费了2个多小时
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