Flood Fill

You are given an m x n integer grid image where image[r][c] is the pixel color at that position, and three integers sr, sc, and color. Examples Example 1: Input: image = [[1,1,1],[1,1,0],[1,0,1]], sr = 1, sc = 1, color = 2 Output: [[2,2,2],[2,2,0],[2,0,1]] Explanation: All pixels connected to (1,1) that were originally color 1 are recolored to 2. Example 2: Input: image = [[0,0,0],[0,0,0]], sr = 0, sc = 0, color = 0 Output: [[0,0,0],[0,0,0]] Explanation: The starting pixel already has the target color, so the image is returned unchanged. Constraints m == image.length n == image[i].length 1 <= m, n <= 50 0 <= image[i][j], color < 2^16 0 <= sr < m 0 <= sc < n