#include<bits/stdc++.h> using namespace std; int main() { int t; cin>>t; while(t--) { int a,b; cin>>a>>b; if(a<0&&b<0) cout<<min(abs(a),min(abs(b),abs(a-b)))<<"\n"; else if(a>0&&b>0) cout<<min(abs(a),min(abs(b),abs(a-b)))<<"\n"; else cout<<"0\n"; } return 0; }