From 2368a622773736ee74f8d432f8cb891ec2f3c74c Mon Sep 17 00:00:00 2001
From: Relsola <sola001018@gmail.com>
Date: Wed, 27 Dec 2023 19:23:37 +0800
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---
 problems/0200.岛屿数量.深搜版.md | 40 +++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/problems/0200.岛屿数量.深搜版.md b/problems/0200.岛屿数量.深搜版.md
index 43eb66e1..a4b93c3d 100644
--- a/problems/0200.岛屿数量.深搜版.md
+++ b/problems/0200.岛屿数量.深搜版.md
@@ -346,6 +346,46 @@ var numIslands = function (grid) {
 };
 ```
 
+### TypeScript
+
+```TypeScript
+function numIslands(grid: string[][]): number {
+	// 四个方向
+	const dir: number[][] = [[0, 1], [1, 0], [-1, 0], [0, -1]];
+	const [m, n]: [number, number] = [grid.length, grid[0].length];
+
+	function dfs(grid: string[][], visited: boolean[][], x: number, y: number) {
+		for (let i = 0; i < 4; i++) {
+			let nextX: number = x + dir[i][0];
+			let nextY: number = y + dir[i][1];
+			// 越界了，直接跳过
+			if (nextX < 0 || nextX >= m || nextY < 0 || nextY >= n) {
+				continue;
+			}
+			// 没有访问过同时是陆地
+			if (!visited[nextX][nextY] && grid[nextX][nextY] === '1') {
+				visited[nextX][nextY] = true;
+				dfs(grid, visited, nextX, nextY);
+			}
+		}
+	}
+
+	const visited: boolean[][] = Array.from({ length: m }, _ => new Array(n).fill(false));
+
+	let result: number = 0;
+	for (let i = 0; i < m; i++) {
+		for (let k = 0; k < n; k++) {
+			if (!visited[i][k] && grid[i][k] === '1') {
+				++result; // 遇到没访问过的陆地，+1
+				visited[i][k] = true;
+				dfs(grid, visited, i, k); // 将与其链接的陆地都标记上 true
+			}
+		}
+	}
+	return result;
+}
+```
+
 ### Go
 
 ```go