#include <bits/stdc++.h>
using namespace std;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}
using Int = long long;
const char newl = '\n';

//INSERT ABOVE HERE
signed main(){
  cin.tie(0);
  ios::sync_with_stdio(0);

  Int n;
  cin>>n;

  using P = pair<Int, Int>;
  set<P> sp1,sp2,sp3,sp4;

  const Int INF = 30000;
  sp1.emplace(0,INF);
  sp2.emplace(0,INF);
  sp3.emplace(0,INF);
  sp4.emplace(0,INF);
  sp1.emplace(INF,0);
  sp2.emplace(INF,0);
  sp3.emplace(INF,0);
  sp4.emplace(INF,0);

  auto calc=[&](auto &sp,P p)->Int{
    auto area=[&](P q)->Int{
      auto it=sp.lower_bound(q);
      auto pr=it;pr--;
      auto nx=it;nx++;
      return (it->first-pr->first)*(it->second-nx->second);
    };

    Int res=0;
    Int x=p.first,y=p.second;
    auto it=sp.lower_bound(P(x,-1));
    if(it->second>=y) return 0;
    while(!sp.empty()){
      auto er=sp.lower_bound(P(x,y));
      if(er==sp.begin()) break;
      er--;
      if(er->second<=y){
        res-=area(*er);
        sp.erase(er);
        continue;
      }
      break;
    }
    sp.emplace(p);
    res+=area(p);
    return res;
  };

  for(Int i=0;i<n;i++){
    Int xa,ya,xb,yb;
    cin>>xa>>ya>>xb>>yb;
    Int dif=0;
    dif+=calc(sp1,P(+xb,+yb));
    dif+=calc(sp2,P(-xa,+yb));
    dif+=calc(sp3,P(-xa,-ya));
    dif+=calc(sp4,P(+xb,-ya));
    cout<<dif<<newl;
  }

  return 0;
}