 2018-12-07 15:34

# 判断一个序列是不是等比级数。用C语言解答这个问题怎么做呢？

Problem Description
Determine whether a sequence is a Geometric progression or not.

In mathematics, a geometric progression, also known as a geometric sequence, is a sequence of numbers where each term after the first is found by multiplying the previous one by a fixed, non-zero number called the common ratio. For example, the sequence 2, 6, 18, 54, ... is a geometric progression with common ratio 3. Similarly 10, 5, 2.5, 1.25, ... is a geometric sequence with common ratio 1/2.

Examples of a geometric sequence are powers rk of a fixed number r, such as 2k and 3k. The general form of a geometric sequence is

a, ar, ar2, ar3, ar4, …

where r ≠ 0 is the common ratio and a is a scale factor, equal to the sequence's start value.

Input
First line contains a single integer T(T≤20) which denotes the number of test cases.

For each test case, there is an positive integer n(1≤n≤100) which denotes the length of sequence,and next line has n nonnegative numbers Ai which allow leading zero.The digit's length of Ai no larger than 100.

Output
For each case, output "Yes" or "No".

Sample Input
4
1
0
3
1 1 1
3
1 4 2
5
16 8 4 2 1

Sample Output
Yes
Yes
No
Yes

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