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#include <iostream>
using namespace std;
typedef int Matrice[1000][1000];
void citire(Matrice m,int x)
{
int i, j;
for(i=1; i<=x; i++)
for(j=1; j<=x; j++)
cin>>m[i][j];
}
void afisare(Matrice m,int x)
{
int i, j;
for(i=1; i<=x; i++)
{for(j=1; j<=x; j++)
cout<<m[i][j]<<' ';
cout<<endl;}
}
void suma(Matrice m, int n, int z,int s)
{
int r=1, i, j, mij;
mij=n/2+n%2;
s=0;
if(z==1)
{
for(i=1; i<=n-1; i++)
for(j=i+1; j<=n-i; j++)
s=s+m[i][j];
cout<<s;
}
if(z==2)
{
for(j=0, r=n; j<=n-1; j++, r--)
for(i=2+j; i<=n-1-j; i++)
s=s+m[i][r];
cout<<s;
}
if(z==3)
{
for(i=n, r=1; i>=mij+1; i--, r++)
for(j=r+1; j<=n-r; j++)
s=s+m[i][j];
cout<<s;
}
if(z==4)
{
for(j=1, r=1; j<=mij-1; j++, r++)
for(i=r+1; i<=n-r; i++)
s=s+m[i][j];
cout<<s;
}
}
Matrice m;
int main()
{
int i, j, n, z, s;
cin>>n>>z;
citire(m, n);
suma(m, n, z, s);
return 0;
}