Divisibility

A - DivisibilityTime Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64uSubmit StatusDescriptionFind the number of k-divisible numbers on the segment [a, b]. In other words you need to find the number of such integervalues x that a ≤ x ≤ b and x is divisibleby k.InputThe only line contains three space-separated integers k, a and b (1 ≤ k ≤ 1018; - 1018 ≤ a ≤ b ≤ 1018).OutputPrint the required number.Sample InputInput

1 1 10

Output

10

Input

2 -4 4

Output

5

AC代码：

#include<stdio.h>int main(){__int64 k,a,b;while(scanf("%I64d%I64d%I64d",&k,&a,&b)!=EOF){if(a>0&&b>0)printf("%I64d\n",b/k-(a-1)/k);if(a<=0&&b>=0)printf("%I64d\n",(b/k-a/k)+1);if(a<0&&b<0)printf("%I64d\n",(b+1)/k-a/k);}return 0;}