#include <bits/stdc++.h>   using namespace std;   int main() {     long long int t;     cin >> t;     while (t--) {       long long int temperature;       long long int a12, b11;       long long int solution;       cin >> a12 >> b11;       if (b11 == a12) {         solution = 0;       } else if (b11 > a12) {         temperature = b11 - a12;         if (temperature & 1) {           solution = 1;         } else {           solution = 2;         }       } else {         temperature = a12 - b11;         if (temperature & 1) {           solution = 2;         } else {           solution = 1;         }       }       cout << solution <<   n ;     }     return 0;   }   