WHAT is error in my code for problem Tickets

help
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WHY my code for this problem Tickets problelm is able to pass just one subtask not the other. What is error in my code.L5Amzw - Online C++0x Compiler & Debugging Tool - Ideone.com
please help me finding it out.

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Consider the test input:

1
ABAC
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In this question,
You Basically need to loop on the string and compare the characters at index 1-3, 2-4, 3-5, 4-6 and so on. If they are equal simply print “Yes” ,else “No”.

Also in the starting itself compare whether s[0]==s[1] if true print “No” , else “Yes”.

If you get my idea try to code it. Otherwise reply back I will send the code to.

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Bro I will suggest use set…by using set it will reduce the time complexity also.