题目不难，却要用unsigned long long 来输入输出。。考验C++基本功

#include 
    
     using namespace std;int main(int argc, char *argv[]){	unsigned long long int a,b;	while(scanf("%I64u%I64u",&a,&b)!=EOF)	{		if(a>b)		{			swap(a,b);		}		unsigned long long int c;		c=b-a+1;		printf("%I64u\n",c);			}	return 0;}