Chef and the Cake I

//Bismillahir Rahmanir Rahim
/******Harun Or Rashid******/
/***********Template Starts Here***********/
#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<cctype>
#include<cstdlib>
#include<string>
#include<vector>
#include<set>
#include<stack>
#include<queue>
#include<map>
#include<algorithm>
using namespace std;

#define MEM(a,b) memset(a,b,sizeof(a))
#define CLR(a) memset(a,0,sizeof(a))
#define MAX(a,b) ((a)>(b)?(a):(b))
#define MIN(a,b) ((a)>(b)?(b):(a))
#define ABS(a) ((a)>0? (a):(-(a)))
#define SQ(a) ((a)*(a))
#define SZ(a) (int)a.size()
#define FORN(i,n) for(i=1;i<=n;i++)
#define FORAB(i,a,b) for(i=a;i<=b;i++)
#define ALL(V) V.begin(),V.end()
#define pb(a) push_back(a)
#define pr(a) cout<<a<<endl
#define pf printf
#define sf scanf
#define swap(a,b) (a ^= b, b ^= a, a ^= b)
#define PI acos(-1)
#define x first
#define y second
#define eps 1e-7

typedef int D;
typedef long long int LLD;
typedef unsigned long long int LLU;
typedef vector<D> VI;
typedef set<D> SI;
typedef vector<D>::iterator Viti;

/***********Template Ends Here***********/

int main()
{
    int T,x1,y1,x2,y2,x3,y3,x4,y4,x5,y5,x6,y6,result;
    cin>>T;
    while(T--)
    {
        cin>>x1>>y1>>x2>>y2>>x3>>y3>>x4>>y4;
        result=0;
        x5=(x1>x3)?x1:x3;
        y5=(y1>y3)?y1:y3;
        x6=(x2>x4)?x4:x2;
        y6=(y2>y4)?y4:y2;
        result+=(x2-x1)*(y2-y1)+(x4-x3)*(y4-y3);
        if(x6>x5 && y6>y5)
            result-=(x6-x5)*(y6-y5);
        cout<<result<<endl;
    }
    return 0;
}