Help needed in Probability problem (CP in 7 days)

help
1

I am getting WA for this problem. Its a pretty straight forward problem of counting total subarrays with sum <= K.
Here is my solution.
P.S- I used this precision function, as setprecision(8) was not giving me only 1 AC in first subtask.
Can anyone provide some counter test cases.

Edit- I just printed the result without precision and got AC. Why was it giving wrong answer when I used setprecision, which I think should give correct decimal places.

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2

@ssjgz can you please help as to why does it give AC without using precision and WA using setprecision. AC submission

3

check this you should found your mistakes :slightly_smiling_face:

4

Thanks for this. I have already got AC. It’s just that, I get WA when I use setprecision(8) and AC when I just print the result. The problem exclusively says

Output one number P to a maximum of 8 decimal places,

So, I think using setprecision should give correct answer.

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5

They asked “Output one number P to a maximum of 8 decimal places”. Not exactly 8.

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6

The thing is that what answer has the problem setter uploaded . Many a times in question involoving decimal digits you will see error approximation that is for precision . May be the setter for this problem didn’t mentioned any Error range so you had to give exact answer as the setter , and since setter would have usey only double without precision so it was giving WA.

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7

It would be much easier if the actual count was asked instead of probability. It just makes us spend time on useless things.

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8

True… there was no checker involved (at least I believe so). So, you got a WA.

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9

Yesss