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