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