cigarettes



3000 ms  |  内存限制： 65535



2



Tom has many cigarettes. We hypothesized that he has n cigarettes and smokes them

one by one keeping all the butts. Out of k > 1 butts he can roll a new cigarette. 
Now，do you know how many cigarettes can Tom has?



First input is a single line,it's n and stands for there are n testdata.then there are n lines ,each line contains two integer numbers giving the values of n and k. 输出 For each line of input, output one integer number on a separate line giving the maximum number of cigarettes that Peter can have. 样例输入

3 4 3 10 3 100 5

样例输出

5 14 124

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上传者

​​rooot​​

#include<stdio.h>
int main()
{
  int test,n,k,t,ans;
  scanf("%d",&test);
  while(test--)
  {
    scanf("%d%d",&n,&k);
    ans=n;
    while(n>=k)
    {
      t=n/k;
      ans+=t;
      n=n-t*k+t;
    }
    printf("%d\n",ans);
  }
  return 0;
}