#include <stdio.h>
//#include <conio.h>

int main()
{
    int n;
    //FILE *f;
    int i,j,k;
    int a[101][101];

    //f=fopen("1313.txt","r");
    //fscanf(f,"%d",&n);
    scanf("%d",&n);

    for (i=1;i<=n;i++)
    {
        for (j=1;j<=n;j++)
        {
            //fscanf(f,"%d",&a[i][j]);
            scanf("%d",&a[i][j]);
        }
    }
    printf("%d ",a[1][1]);

    for (i=2;i<=n;i++)
    {
        printf("%d ",a[i][1]);
        if (i>2)
        {
            for (j=i-1,k=2;k<=i-1;j--,k++)
            {
                printf("%d ",a[j][k]);
            }
        }
        printf("%d ",a[1][i]);
    }

    for (i=2;i<n;i++)
    {
        printf("%d ",a[n][i]);
        if (i<n-1)
        {
            for (j=n-1,k=i+1;k<=n-1;k++,j--)
            {
                printf("%d ",a[j][k]);
            }
        }
        printf("%d ",a[i][n]);
    }
        printf("%d ",a[n][n]);

    //getch();
    return 0;
}

Try this test:
1
1

+1

I did not consider it first. Really helped!