I was seeing the solution of this 518D - Ilya and Escalator in the tutorial, and i don't know why after calculate the dp the answer is for j from 0 to n dp[j][t]*j. What mean the multiplication?, i don't understand this. Thank for your time!!!
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Codeforces (c) Copyright 2010-2024 Mike Mirzayanov
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Expected value =
So, answer =
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Thank, i did not know this topic and i trying to calculate the probability but the problem did not give me equal to the solution, and i see the tutorial but the solution taken aback.