# 733 Flood Fill

### Problem

An image is represented by a 2-D array of integers, each integer representing the pixel value of the image (from 0 to 65535).

Given a coordinate (sr, sc) representing the starting pixel (row and column) of the flood fill, and a pixel value newColor, "flood fill" the image.

To perform a "flood fill", consider the starting pixel, plus any pixels connected 4-directionally to the starting pixel of the same color as the starting pixel, plus any pixels connected 4-directionally to those pixels (also with the same color as the starting pixel), and so on. Replace the color of all of the aforementioned pixels with the newColor.

At the end, return the modified image.

Example 1:

```
Input: 
image = [[1,1,1],[1,1,0],[1,0,1]]
sr = 1, sc = 1, newColor = 2
Output: [[2,2,2],[2,2,0],[2,0,1]]
Explanation: 
From the center of the image (with position (sr, sc) = (1, 1)), all pixels connected 
by a path of the same color as the starting pixel are colored with the new color.
Note the bottom corner is not colored 2, because it is not 4-directionally connected
to the starting pixel.
```

Note:

* The length of image and image\[0] will be in the range \[1, 50].
* The given starting pixel will satisfy 0 <= sr < image.length and 0 <= sc < image\[0].length.
* The value of each color in image\[i]\[j] and newColor will be an integer in \[0, 65535].

### Solutions

```java
class Solution {
    public int[][] floodFill(int[][] image, int sr, int sc, int newColor) {
        int oColor = image[sr][sc];
        if (oColor == newColor) {
            return image;
        }
        int[][] dir = new int[][]{{0, 1},{0, -1},{1, 0},{-1, 0}};
        image[sr][sc] = newColor;
        for (int i = 0; i < dir.length; i ++) {
            int nextX = sr + dir[i][0];
            int nextY = sc + dir[i][1];
            if (nextX < 0 || nextX >= image.length || nextY < 0 || nextY >= image[0].length) {
                continue;
            }
            if (image[nextX][nextY] != oColor) {
                continue;
            }
            floodFill(image, nextX, nextY, newColor);
        }
        return image;
    }
}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://ugopireddy.gitbook.io/leet-code-solutions/solutions-701-750/733-flood-fill.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.