寻找倍数

题目描述

给你三个数a,b,k，请你找出[a,b]中k的倍数.

Description in English:

 Give you three numbers a, b, k, please find out how many numbers are multiples of k between [a, b] . 

输入

三个数依次为k, a, b.其中1≤k≤1018， 0≤a≤b≤1018

Input:

3 numbers follows as k,a,b. (1≤k≤1018， 0≤a≤b≤1018)

输出

一个数字代表答案。

Output:

1 integer.

样例输入

2 0 4

样例输出

3

  代码

#include <stdio.h>
int main() {
long long k, a, b;
scanf("%lld%lld%lld", &k, &a, &b);
printf("%lld\n", b / k - a / k + (a % k == 0 ? 1 : 0));
return 0;
}