Spirally traversing a matrix.cpp

Spirally traversing a matrix: https://practice.geeksforgeeks.org/problems/spirally-traversing-a-matrix-1587115621/1

class Solution
{   
public:     
    vector<int> spirallyTraverse(vector<vector<int> > matrix, int r, int c) 
    {
        // code here
        int top = 0;
        int bottom = r-1;
        int left = 0;
        int right = c-1;
        
        vector<int> ans;
        
        while(top<=bottom && left<=right){
            
            for(int i=left; i<=right ; i++)
                ans.push_back(matrix[top][i]);
            top++;
            
            for(int i=top;i<=bottom;i++)
                ans.push_back(matrix[i][right]);
            right--;
            
            if(top<=bottom){
                for(int i=right;i>=left;i--)
                    ans.push_back(matrix[bottom][i]);
                bottom--;
            }
            
            if(left<=right){
                for(int i=bottom;i>=top;i--)
                    ans.push_back(matrix[i][left]);
                left++;
            }
        }
        
        return ans;
    }
};