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## Discussion of Problem 1131. Copying

WA6
Posted by hatred 13 Aug 2011 01:33
where is my mistake?

#include <cstdio>
#include <cmath>

inline int lb(int n) { return ceil(log(double(n))/log(2.0)); }

int main() {
int n,k;
scanf("%d%d",&n,&k);
if (n<=k) printf("%d",lb(n));
else {
int ans=lb(k);
n-=1l << ans;
ans+=n/k;
if (n%k) ++ans;
printf("%d",ans);
}
}
Re: WA6
Posted by Jobed 17 Apr 2014 13:05
I got WA6 too...can you please tell me the case?
Re: WA6
Posted by BillSu 26 Apr 2014 12:17
Your formula is wrong.
Re: WA6
Posted by Siroj Matchanov [TUIT] 9 Feb 2018 04:11
Whoever gets Wrong Answer at 6th test, try to change your way of finding the power of two.

My solution got WA#6 when I calculated power of two this way:
power = ceil(log(x)/log(2));

Better calculate it by multiplying it.
Re: WA6
Posted by Sergey Nikolaev 5 Apr 2018 20:27
Could you explain, why it is better ?