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1552:Doubles

题目描述
As part of an arithmetic competency program, your students will be given randomly generated lists of from 2 to 15 unique positive integers and asked to determine how many items in each list are twice some other item in the same list. You will need a program to help you with the grading. This program should be able to scan the lists and output the correct answer for each one. For example, given the list
1 4 3 2 9 7 18 22

your program should answer 3, as 2 is twice 1, 4 is twice 2, and 18 is twice 9.
输入解释
The input will consist of one or more lists of numbers. There will be one list of numbers per line. Each list will contain from 2 to 15 unique positive integers. No integer will be larger than 99. Each line will be terminated with the integer 0, which is not considered part of the list. A line with the single number -1 will mark the end of the file. The example input below shows 3 separate lists. Some lists may not contain any doubles.
输出解释
The output will consist of one line per input list, containing a count of the items that are double some other item.
输入样例
1 4 3 2 9 7 18 22 0
2 4 8 10 0
7 5 11 13 1 3 0
-1
输出样例
3
2
0

该题目是Virtual Judge题目,来自 北京大学POJ

题目来源 Mid-Central USA 2003

源链接: POJ-1552

最后修改于 2020-10-29T06:07:10+00:00 由爬虫自动更新

共提交 0

通过率 --%
时间上限 内存上限
1000 10000