2d_array.cpp

#include<iostream>
using namespace std;

int main(){
    int m,n;
    cin>>m>>n;
    int arr[m][n];
    for(int i=0;i<m;i++){
        for(int j=0;j<n;j++){
            cin>>arr[i][j];
        }
    }
    int col_start = 0, col_end = n-1, row_start = 0, row_end = m-1;
    while(col_start<=col_end && row_start<=row_end){
        for(int col=col_start;col<=col_end;col++){
            cout<<arr[row_start][col]<<" ";
        }
        row_start++;
        for(int row=row_start;row<=row_end;row++)
            cout<<arr[row][col_end]<<" ";
        col_end--;

        for(int col=col_end;col>=col_start;col--)
        cout<<arr[row_end][col]<<" ";
        row_end--;

        for(int row=row_end;row>=row_start;row--){
            cout<<arr[row][col_start]<<" ";
        }
        col_start++;
    }
    return 0;
}