NYOJ - cigarettes

cigarettes

描述

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?

输入

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

#include <stdio.h>
int main()
{int n,x,y;scanf("%d",&n);while(n--){scanf("%d%d",&x,&y);int s = x;while(x >= y){  s += x/y;x = x/y + (x%y);}printf("%d\n",s);}
}