#include <iostream>
using namespace std;
int main() {
int n, x, y, sum;
cin >> n;
for (int i = 0; i < n; i++){
cin >> x >> y;
if (x > y){
swap(x, y);
}
sum = 0;
for (int j = x + 1; j < y; j++){
if (j % 2){
sum += j;
}
}
cout << sum << endl;
}
return 0;
}