SpirallyTraversingMatrix.cpp

#include <bits/stdc++.h> 
using namespace std;

class Solution
{   
    public: 
    //Function to return a list of integers denoting spiral traversal of matrix.
    vector<int> spirallyTraverse(vector<vector<int>> matrix, int r, int c) 
    {
       int top,bottom,left,right,dir;
    top=0;
    bottom=r-1;
    left=0;
    right=c-1;
    dir=0;
    int i;
    vector<int> ans;
    
    while(top<=bottom && left<=right)
    {
        if(dir==0)
        {
            for(i=left;i<=right;i++)
                ans.push_back(matrix[top][i]);
            top++;
        }
        else if(dir==1)
        {
            for(i=top;i<=bottom;i++)
                ans.push_back(matrix[i][right]);
            right--;
        }
        else if(dir==2)
        {
            for(i=right;i>=left;i--)
                ans.push_back(matrix[bottom][i]);
            bottom--;
        }
        else if(dir==3)
        {
            for(i=bottom;i>=top;i--)
                ans.push_back(matrix[i][left]);
            left++;
        }
        dir=(dir+1)%4;
    }
    return ans; 
    }
};

int main() {
    int t;
    cin>>t;
    
    while(t--) 
    {
        int r,c;
        cin>>r>>c;
        vector<vector<int> > matrix(r); 

        for(int i=0; i<r; i++)
        {
            matrix[i].assign(c, 0);
            for( int j=0; j<c; j++)
            {
                cin>>matrix[i][j];
            }
        }

        Solution ob;
        vector<int> result = ob.spirallyTraverse(matrix, r, c);
        for (int i = 0; i < result.size(); ++i)
                cout<<result[i]<<" ";
        cout<<endl;
    }
    return 0;
}