diff --git a/solution/0000-0099/0078.Subsets/README.md b/solution/0000-0099/0078.Subsets/README.md
index 5ca822064af4f..399ab297d9a79 100644
--- a/solution/0000-0099/0078.Subsets/README.md
+++ b/solution/0000-0099/0078.Subsets/README.md
@@ -315,4 +315,27 @@ function subsets(nums: number[]): number[][] {
 
 <!-- solution:end -->
 
+<!-- solution:start -->
+
+### 方法三
+
+<!-- tabs:start -->
+
+#### TypeScript
+
+```ts
+function subsets(nums: number[]): number[][] {
+    const res: number[][] = [[]];
+    for (const x of nums) {
+        res.push(...res.map(arr => [...arr, x]));
+    }
+
+    return res;
+}
+```
+
+<!-- tabs:end -->
+
+<!-- solution:end -->
+
 <!-- problem:end -->
diff --git a/solution/0000-0099/0078.Subsets/README_EN.md b/solution/0000-0099/0078.Subsets/README_EN.md
index 29cc0451aa660..1ee939f5ce1f1 100644
--- a/solution/0000-0099/0078.Subsets/README_EN.md
+++ b/solution/0000-0099/0078.Subsets/README_EN.md
@@ -313,4 +313,27 @@ function subsets(nums: number[]): number[][] {
 
 <!-- solution:end -->
 
+<!-- solution:start -->
+
+### Solution 3
+
+<!-- tabs:start -->
+
+#### TypeScript
+
+```ts
+function subsets(nums: number[]): number[][] {
+    const res: number[][] = [[]];
+    for (const x of nums) {
+        res.push(...res.map(arr => [...arr, x]));
+    }
+
+    return res;
+}
+```
+
+<!-- tabs:end -->
+
+<!-- solution:end -->
+
 <!-- problem:end -->
diff --git a/solution/0000-0099/0078.Subsets/Solution3.ts b/solution/0000-0099/0078.Subsets/Solution3.ts
new file mode 100644
index 0000000000000..12637fe8ae0ce
--- /dev/null
+++ b/solution/0000-0099/0078.Subsets/Solution3.ts
@@ -0,0 +1,8 @@
+function subsets(nums: number[]): number[][] {
+    const res: number[][] = [[]];
+    for (const x of nums) {
+        res.push(...res.map(arr => [...arr, x]));
+    }
+
+    return res;
+}