#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
    int n,t;
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        int x=0,y=0,num=0;
        cin>>x>>y;
        if(y>x)
        {
            t=y;
            y=x;
            x=t;
        }
        if(x-y!=0)
        {
            for(int j=1;j<=x-y-1;j++)
            {
                int c=0;
                c=y+j;
                if(c%2==0)
                continue;
                else
                num+=c;
            }
            cout<<num<<endl;
        }
        else
        cout<<"0"<<endl;
    }
    return 0;
}