feat: add typescript solution to lc problem: No.0447

No.0447.Number of Boomerangs

Author: zhaocchen

solution/0400-0499/0447.Number of Boomerangs/README.md

@@ -95,6 +95,25 @@ class Solution {
 }
 ```
 
+### **TypeScript**
+
+```ts
+function numberOfBoomerangs(points: number[][]): number {
+    let ans = 0;
+    for (let p1 of points) {
+        let hashMap: Map<number, number> = new Map();
+        for (let p2 of points) {
+            const distance = (p1[0] - p2[0]) ** 2 + (p1[1] - p2[1]) ** 2;
+            hashMap.set(distance, (hashMap.get(distance) || 0) + 1);
+        }
+        for (let [ , v] of [...hashMap]) {
+            ans += (v * (v - 1));
+        }
+    }
+    return ans;
+};
+```
+
 ### **Go**
 
 ```go

solution/0400-0499/0447.Number of Boomerangs/README_EN.md

@@ -83,6 +83,25 @@ class Solution {
 }
 ```
 
+### **TypeScript**
+
+```ts
+function numberOfBoomerangs(points: number[][]): number {
+    let ans = 0;
+    for (let p1 of points) {
+        let hashMap: Map<number, number> = new Map();
+        for (let p2 of points) {
+            const distance = (p1[0] - p2[0]) ** 2 + (p1[1] - p2[1]) ** 2;
+            hashMap.set(distance, (hashMap.get(distance) || 0) + 1);
+        }
+        for (let [ , v] of [...hashMap]) {
+            ans += (v * (v - 1));
+        }
+    }
+    return ans;
+};
+```
+
 ### **Go**
 
 ```go

solution/0400-0499/0447.Number of Boomerangs/Solution.ts

@@ -0,0 +1,14 @@
+function numberOfBoomerangs(points: number[][]): number {
+    let ans = 0;
+    for (let p1 of points) {
+        let hashMap: Map<number, number> = new Map();
+        for (let p2 of points) {
+            const distance = (p1[0] - p2[0]) ** 2 + (p1[1] - p2[1]) ** 2;
+            hashMap.set(distance, (hashMap.get(distance) || 0) + 1);
+        }
+        for (let [ , v] of [...hashMap]) {
+            ans += (v * (v - 1));
+        }
+    }
+    return ans;
+};