HackerEarth Maximum AND problem solution

#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define MOD 1000000007
int main()
{
    ios_base::sync_with_stdio(false);
    int t;
    cin>>t;
    assert(t>=1 && t<=1000);
    while(t--)
    {
        ll a,b,ans;
        cin>>a>>b;
        assert(b>=1 && b<=1000000000000000000LL && a>=1 && a<b);
        if(b-a+1<3)
            ans=(a&b);
        else if(b&1)
            ans=(b&(b-1));
        else
            ans=((b-1)&(b-2));
        cout<<ans<<endl;
    }
    return 0;
}