How to make use of the hint 3 and 4? We can keep trace of V wormhole and perform the operation in linear time but how to keep track of W wormhole?
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[ZCO12002] Wormholes (ZCO 2012: India)
Zonal Computing Olympiad is round 1 out of 3 (i.e. beginner) for selection into Indian IOI team.
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