Day8-9

695. Max Area of Island/695. Max Area of Island.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>_695._Max_Area_of_Island</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

695. Max Area of Island/Program.cs

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+namespace _695._Max_Area_of_Island;
+
+internal class Program
+{
+    static void Main(string[] args)
+    {
+        int[][] matrix = {new int[] {0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0},new int[] {0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0},new int[] {0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0},new int[] {0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0},new int[] {0, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0},new int[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0},new int[] {0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0},new int[] {0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0}};
+        Console.WriteLine(new Solution().MaxAreaOfIsland(matrix));
+    }
+}

695. Max Area of Island/Solution.cs

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+namespace _695._Max_Area_of_Island;
+
+public class Solution
+{
+    public int MaxAreaOfIsland(int[][] grid)
+    {
+        bool[][] visited = new bool[grid.Length][];
+        for (int i = 0; i < visited.Length; i++)
+            visited[i] = new bool[grid[i].Length];
+
+        int max = 0;
+        for (int y = 0; y < grid.Length; y++)
+        {
+            for (int x = 0; x < grid[y].Length; x++)
+            {
+                if (grid[y][x] == 0)
+                    continue;
+
+                int curCount = 0;
+                Recursion(grid, y, x, ref curCount, visited);
+                max = Math.Max(max, curCount);
+            }
+        }
+        return max;
+    }
+
+    private void Recursion(int[][] grid, int y, int x, ref int count, bool[][] visited)
+    {
+        if (visited[y][x] || grid[y][x] == 0)
+            return;
+        visited[y][x] = true;
+        count++;
+        for (int i = 1; i < 8; i += 2)
+        {
+            int nextY = i / 3 + y - 1;
+            int nextX = i % 3 + x - 1;
+            if (nextY >= 0 && nextY < grid.Length && nextX >= 0 && nextX < grid[nextY].Length)
+                Recursion(grid, nextY, nextX, ref count, visited);
+        }
+    }
+}