func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long t;     cin >> t;     while (t--) {       long long a, b, c, d, e, i, j, k, l;       cin >> a >> b;       if (a <= b)         cout << abs(a - b) << endl;       else if (a % 2 + b % 2 == 1)         cout << 1 << endl;       else         cout << 0 << endl;     }   }   