Divisibility

Divisibility

Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u

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Description

Find the number of k-divisible numbers on the segment [a, b]. In other words you need to find the number of such integer values x that a ≤ x ≤ b and x is divisible by k.

Input

The only line contains three space-separated integers k, a and b (1 ≤ k ≤ 10¹⁸; - 10¹⁸ ≤ a ≤ b ≤ 10¹⁸).

Output

Print the required number.

Sample Input

Input

1 1 10

Output

10

Input

2 -4 4

Output

5

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求出来在a到b所有k的倍数

不可以直接用循环会超时 直接看代码

#include<cstdio>int main(){long long k,a,b;while(~scanf("%lld %lld %lld",&k,&a,&b)){if(a<0&&b>0){//a和b之间有一个0需要加上a=-a;printf("%lld\n",a/k+b/k+1);}else if(a<0&&b<=0){//同为负的情况a=-a;b=-b;if(b%k==0)printf("%lld\n",a/k-b/k+1);elseprintf("%lld\n",a/k-b/k);}else{//同为正的情况if(a%k==0)printf("%lld\n",b/k-a/k+1);elseprintf("%lld\n",b/k-a/k);}}return 0;}