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