I checked my solution of Chef and Bipartite Graphs against many randomly generated test cases using below attached files and the solution seems correct, but codechef judge is giving WA for the particular solution even after rejudge. Can anybody please help me to figure out the problem with my code, or the checker.

Question Link : https://www.codechef.com/ACMIND16/problems/ICPC16F

Solution Link : http://ideone.com/nV20zD

Random Input Generator Link : http://ideone.com/lZZlbt

Checker Link : http://ideone.com/wm8EzY

Update : I found my mistake.