feat: add typescript solution to lc problem: No.0448.Find All Numbers Disappeared in an Array

Author: zhaocchen

solution/0400-0499/0448.Find All Numbers Disappeared in an Array/README.md

@@ -72,6 +72,26 @@ class Solution {
 }
 ```
 
+### **TypeScript**
+
+```ts
+function findDisappearedNumbers(nums: number[]): number[] {
+    for (let i = 0; i < nums.length; i++) {
+        let idx = Math.abs(nums[i]) - 1;
+        if (nums[idx] > 0) {
+            nums[idx] *= -1;
+        }
+    }
+    let ans = [];
+    for (let i = 0; i < nums.length; i++) {
+        if (nums[i] > 0) {
+            ans.push(i + 1);
+        }
+    }
+    return ans;
+};
+```
+
 ### **C++**
 
 ```cpp

solution/0400-0499/0448.Find All Numbers Disappeared in an Array/README_EN.md

@@ -66,6 +66,26 @@ class Solution {
 }
 ```
 
+### **TypeScript**
+
+```ts
+function findDisappearedNumbers(nums: number[]): number[] {
+    for (let i = 0; i < nums.length; i++) {
+        let idx = Math.abs(nums[i]) - 1;
+        if (nums[idx] > 0) {
+            nums[idx] *= -1;
+        }
+    }
+    let ans = [];
+    for (let i = 0; i < nums.length; i++) {
+        if (nums[i] > 0) {
+            ans.push(i + 1);
+        }
+    }
+    return ans;
+};
+```
+
 ### **C++**
 
 ```cpp

solution/0400-0499/0448.Find All Numbers Disappeared in an Array/Solution.ts

@@ -0,0 +1,15 @@
+function findDisappearedNumbers(nums: number[]): number[] {
+    for (let i = 0; i < nums.length; i++) {
+        let idx = Math.abs(nums[i]) - 1;
+        if (nums[idx] > 0) {
+            nums[idx] *= -1;
+        }
+    }
+    let ans = [];
+    for (let i = 0; i < nums.length; i++) {
+        if (nums[i] > 0) {
+            ans.push(i + 1);
+        }
+    }
+    return ans;
+};