padfoot1717's blog

Why does ceil fail??
By padfoot1717, history, 3 years ago, In English

A few times while solving a problem where we need to compute ceil values, i have encoured WA when i use ceil(var1/double(var2)) type of expression, for example in this problem a submission of mine was failing on just 2 TCs because of using that expression, and soon as i used a different approach for calculating ceil, i got AC. I wanted to know, what is the fundamental issue behind this inaccuracy?

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3 years ago, # |
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"I wanted to know, what is the fundamental issue behind this inaccuracy?"

double

The correct way to calculate ceil I use is:

x/y+1-(x%y==0)
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    3 years ago, # ^ |
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    I see this approach for a first time. The more usual one(I guess) is (x + y — 1) / y

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