Flood fill

class Solution {
public:

    void dfs(vector<vector<int>>& image, int i, int j, int initialColor, int color, int &n, int &m){

        if(i<0 || i>=n || j<0 || j>=m)return;

        if(image[i][j]!=initialColor)return;

        image[i][j] = color;

        dfs(image, i-1,j,initialColor,color, n,m);
        dfs(image, i+1,j,initialColor,color, n,m);
        dfs(image, i,j-1,initialColor,color, n,m);
        dfs(image, i,j+1,initialColor,color, n,m);

        return;


    }

    vector<vector<int>> floodFill(vector<vector<int>>& image, int sr, int sc, int color) {

        int n= image.size();
        int m = image[0].size();

        int initialColor = image[sr][sc];

        if(initialColor==color)return image;

        dfs(image, sr,sc,initialColor,color, n,m);

        return image;

    }
};