using namespace std;
#define N 3
//input a[N][N]
void input(int a[N][N])
{
cout<<"Please input by rows:"<<endl;
for(int i=0;i<N;i++)
for(int j=0;j<N;j++)
{
cin>>a[i][j];
}
}
//compute the positive value
int PositiveValue(int a[N][N])
{
int product=0,sum=0;
for(int j=0;j<N;j++)
{
//the first value is in ROW0
product=a[0][j];
int k=j+1;
//the next N-1 Row's product
for(int m=1;m<N;m++)
product*=a[m][(k++)%N];
//positive sum
sum+=product;
}
return sum;
}
//compute the negative value
int NegativeValue(int a[N][N])
{
int product=0,sum=0;
for(int j=N-1;j>=0;j--)
{
//the first value is in ROW0
product=a[0][j];
int k=j-1;
//the next N-1 Row's product
for(int m=1;m<N;m++)
product*=a[m][(k--+N)%N];
//positive sum
sum+=product;
}
return sum;
}
//Main
int main()
{
int a[N][N];
int psum=0,nsum=0,sum=0;
input(a);
if(N==1)
sum=a[0][0];
else if(N==2)
{
psum=a[0][0]*a[1][1];
nsum=a[0][1]*a[1][0];
}
else
{
psum=PositiveValue(a);
nsum=NegativeValue(a);
}
sum=psum-nsum;
cout<<"the result is:"<<sum;
return 0;
}