#include <bits/stdc++.h>   using namespace std;   int main() {     int t, a, b, x;     cin >> t;     while (t--) {       cin >> a >> b;       if (a < b) {         x = b - a;         x % 2 == 0 ? cout << 2 : cout << 1;       } else if (a > b) {         x = a - b;         x % 2 == 0 ? cout << 1 : cout << 2;       } else         cout << 0;       cout << endl;     }   }   