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