Reshape implementation in matlab

In fact, it is a reshaping matrix algorithm, the specific implementation is as follows

    vector<vector<int>> matrixReshape(vector<vector<int>>& mat, int r, int c) {
        int m=mat.size();
        int n=mat[0].size();
        if(m*n!=r*c)
        {
        return mat;
        }
          vector<vector<int>> ans(r, vector<int>(c));
        for(int i=0;i<m*n;i++){
            ans[i/c][i%c]=mat[i/n][i%n];
        }
        return ans;
        
    }

It is to convert the A[x][y] matrix into B[]m[n], where x*y=m*n