Boundary_Traversal.cpp

class Solution
{   
    public:
    //Function to return list of integers that form the boundary 
    //traversal of the matrix in a clockwise manner.
    vector<int> boundaryTraversal(vector<vector<int> > matrix, int n, int m) 
    {
        // code here
        vector<int> ans;
        for(int j = 0; j < m; ++j) ans.push_back(matrix[0][j]);
        for(int i = 1; i < n; ++i) ans.push_back(matrix[i][m-1]);
        for(int j = m-2; j >= 0 and n != 1; --j) ans.push_back(matrix[n-1][j]);
        for(int i = n-2; i > 0 and m != 1; --i) ans.push_back(matrix[i][0]);
        return ans;
    }
};