Wrong answer for pairing question in graph algorithms

#1

My code is showing wrong answer plz check my code and correct my code and let me know my mistake.----- problem : https://online.codingblocks.com/app/player/39658/content/77399/5256/code-challenge ------Mycode : https://ide.codingblocks.com/s/221145 plz reply Asap

#2

@sengarankit98,
Redundant, follow here

#3

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