Why this code have WA on test13?
Please give me a test when this program fail.

var N,K:longint;
begin
  readln(N,K);
  if k>N then n:=k;
  N:=2*N;
  if N mod K = 0 then writeln(N div K)
                 else writeln(N div K + 1);
end.

change 'readln' into 'read'
and 'writeln' into 'write'
and you'll get AC
Good luck =D

Edited by author 20.03.2011 10:37

Really, I just change readln to read and give AC.

But in the text of problem:
ENG:
The only input line contains the integers n and k separated with a space
RUS:
В единственной строке через пробел записаны целые числа n и k

Why readln is wrong in this input???

I don't know =D

1820. Уральские бифштексы
Ограничение времени: 0.5 секунды
Ограничение памяти: 64 МБ

#include <iostream>
using namespace std;
void main()
{
int N,K,p;
cin>>N>>K;
if(K>N) N=K;
N=2*N;
if((N%K)==0) cout<<N/K;
else cout<<(N/K)+1;
}