#include<iostream>
#include<algorithm>
using namespace std;
int main(){
    int n,a,b;
    cin>>n;
    while(n--!=0){
        cin>>a>>b;
        int nums=0;
        if(a>b) swap(a,b);
        for(int i=a+1;i<b;i++){

            if(i%2!=0) nums=nums+i;

        }
         cout<<nums<<endl;
    }
    return 0;
}