Spirala /rotire 90/ oglindire matrice

#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("spirala.in");
ofstream fout("spirala.out");
int n,a[101][101],b[101][101];
int main()
{
    fin>>n;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            fin>>a[i][j];
            ///rotirea cu 90 grade invers acelor de ceasornic
            b[n-j+1][i]=a[i][j];
        }
    }
    ///afisarea matricei rotite cu 90 grade
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            fout<<b[i][j]<<" ";
        }
        fout<<endl;
    }
    fout<<endl;
    ///matricea in oglinda
    for(int i=1;i<=n;i++){
        for(int j=n;j>=1;j--){
            fout<<a[i][j]<<" ";
        }
        fout<<endl;
    }
    ///desfasurarea spiralei
    for(int k=1;k<=n/2;k++){
        ///prima linie
        for(int j=k;j<=n-k;j++){
            fout<<a[k][j]<<" ";
        }
        ///fout<<" # ";

        ///ultima col
        for(int i=k;i<=n-k;i++){
            fout<<a[i][n-k+1]<<" ";
        }
        ///fout<<" $ ";


        ///ultima lin
        for(int j=n-k+1;j>k;j--){
            fout<<a[n-k+1][j]<<" ";
        }
        ///prima coloana
        for(int i=n-k+1;i>k;i--){
            fout<<a[i][k]<<" ";
        }
    }

    return 0;
}