Can someone prove the correctness of the approach described in the first answer on the thread? I understand why the first step is crucial as a starting point.
Thanks in advance!
Can someone prove the correctness of the approach described in the first answer on the thread? I understand why the first step is crucial as a starting point.
Thanks in advance!
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Old Codeforces thread on the same topic.
It also reminded me an ancient TopCoder problem. It looks very similar, but extremely tricky.