#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll N=1e6+5;
ll b[N];
void solve(){
    ll n;cin>>n;
    ll l=0,r=1e9,c=0;
    while(n--){
        ll a,x;cin>>a>>x;
        if(a==1){
            if(x>l) l=x;
        }
        else if(a==2){
            if(x<r) r=x;
        }
        else if(a==3){
            b[++c]=x;
        }
    }
    ll ans=0;
    if(r>=l) ans=r-l+1;
    for(int i=1;i<=c;i++){
        if(b[i]>=l&&b[i]<=r) ans-=1;
    }
    cout<<ans<<'\n';
}
int main(){
    ios::sync_with_stdio(false),cin.tie(0),cout.tie(0);
    ll _=1;
    cin>>_;
    while(_--){
        solve();
    }
    return 0;
}