编程介的小学生 2017-06-05 08:59 采纳率: 20.5%
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Q-Sequence

Problem Description
A Q-sequence is defined as:

Q-Seq := 0 or
Q-Seq := Q-seq Q-seq 1

That is to say a Q-Sequence is a single '0' or two Q-Sequences followed by an '1'.

Given a sequence of '0's and '1's, you are to determine whether it is a Q-Sequence.

Input
The first line is a number n refers to the number of test cases. Then n lines follows, each line has a string made up of '1's and '0's. The maximum length of the sequence is 1000.

Output
The output contain n lines, print "Yes" if it is a Q-sequence, otherwise print "No".

Sample Input
3
0010011
0101
00011

Sample Output
Yes
No
Yes

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  • threenewbee 2017-06-05 17:01
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