Here is the link of the question Boredom (Div 1)
and here is my implementation Ideone Link
Can you please spot the error? It is a very short code. Thanks 
Your code is accepted now.
Check my submission. Just did slight modification in your code.
Actually you are using int and i*cnt[i]+arr[i-2] can exceed range of int so just replace int with long long and get Accepted.
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