feat: add ts solution to lc problem: No.1780 (doocs#1487)

Author: thinkasany

solution/1700-1799/1780.Check if Number is a Sum of Powers of Three/README.md

@@ -115,6 +115,18 @@ func checkPowersOfThree(n int) bool {
 }
 ```
 
+### **TypeScript**
+
+```ts
+function checkPowersOfThree(n: number): boolean {
+    while (n) {
+        if (n % 3 > 1) return false;
+        n = Math.floor(n / 3);
+    }
+    return true;
+}
+```
+
 ### **...**
 
 ```

solution/1700-1799/1780.Check if Number is a Sum of Powers of Three/README_EN.md

@@ -100,6 +100,18 @@ func checkPowersOfThree(n int) bool {
 }
 ```
 
+### **TypeScript**
+
+```ts
+function checkPowersOfThree(n: number): boolean {
+    while (n) {
+        if (n % 3 > 1) return false;
+        n = Math.floor(n / 3);
+    }
+    return true;
+}
+```
+
 ### **...**
 
 ```

solution/1700-1799/1780.Check if Number is a Sum of Powers of Three/Solution.ts

@@ -0,0 +1,7 @@
+function checkPowersOfThree(n: number): boolean {
+    while (n) {
+        if (n % 3 > 1) return false;
+        n = Math.floor(n / 3);
+    }
+    return true;
+}