1689: Problem C: Square
内存限制：128 MB
时间限制：1 S
题面：传统
评测方式：文本比较
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提交：1
通过：1
题目描述
Problem C: Square
Given a set of sticks of various lengths, is it possible to join them end-to-end to form a square?
The first line of input contains N, the number of test cases. Each test case begins with an integer 4 <= M <= 20, the number of sticks. M integers follow; each gives the length of a stick - an integer between 1 and 10,000.
For each case, output a line containing "yes" if is is possible to form a square; otherwise output "no".
输入样例 复制
3
4 1 1 1 1
5 10 20 30 40 50
8 1 7 2 6 4 4 3 5
输出样例 复制
yes
no
yes