#include <bits/stdc++.h>

using namespace std;
using ll = long long;

bool f(ll X, ll A, ll B){
    if (X*X-A-B <= 0) return 0;
    if (X*X-A-B > 3e9) return 1;
    return A*B*4 < (X*X-A-B) * (X*X-A-B);
}

void solve(){
    ll A, B;
    cin >> A >> B;
    ll l=0, r=1e9, c;
    while(r-l>1){
        c = (l+r)/2;
        if (f(c, A, B)) r=c;
        else l=c;
    }

    cout << r << endl;
}

int main(){

    int N;
    cin >> N;
    while(N){
        N--;
        solve();
    }

    return 0;
}