UVa 10055 - Hashmat the Brave Warrior

https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=94&page=show_problem&problem=996

解题思路：求两个数差值的绝对值，注意用long；

 #include<iostream>
 using namespace std;

 int main()
 {
    long a,b;
    while(cin>>a>>b)
        {
            if(b>a)
            cout<<b-a<<endl;
            else
            cout<<a-b<<endl;
        }
    return ;
 }