Day8-9

733. Flood Fill/733. Flood Fill.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>_733._Flood_Fill</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

733. Flood Fill/Program.cs

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+namespace _733._Flood_Fill;
+
+internal class Program
+{
+    static void Main(string[] args)
+    {
+        int[][] matrix = new int[][] {  new int[] { 1,1,1 },
+                                        new int[] { 1,1,0 },
+                                        new int[] { 1,0,1 } };
+        var res = new Solution().FloodFill(matrix, 1,1, 2);
+        foreach(var row in res)
+            Console.WriteLine(String.Join(" ", row));
+    }
+}

733. Flood Fill/Solution.cs

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+namespace _733._Flood_Fill;
+
+public class Solution
+{
+    public int[][] FloodFill(int[][] image, int sr, int sc, int color)
+    {
+        int[][] res = new int[image.Length][];
+        for (int i = 0; i < res.Length; i++)
+            res[i] = image[i].ToArray();
+
+        bool[][] colored = new bool[image.Length][];
+        for (int i = 0; i < colored.Length; i++)
+            colored[i] = new bool[image[i].Length];
+        Recursion(res, sr, sc, res[sr][sc], color, colored);
+        return res;
+    }
+
+    private void Recursion(int[][] image, int y, int x, int sourceColor, int toColor, bool[][] colored)
+    {
+        if (image[y][x] != sourceColor || colored[y][x])
+            return;
+        image[y][x] = toColor;
+        colored[y][x] = true;
+        for (int i = 1; i < 8; i += 2)
+        {
+            int nextY = i / 3 + y - 1;
+            int nextX = i % 3 + x - 1;
+            if (nextY >= 0 && nextY < image.Length && nextX >= 0 && nextX < image[nextY].Length)
+                Recursion(image, nextY, nextX, sourceColor, toColor, colored);
+        }
+    }
+}