feat: add typescript solution to lc problem: No.0611.Valid Triangle Number

Author: zhaocchen

solution/0600-0699/0611.Valid Triangle Number/README.md

@@ -85,6 +85,28 @@ class Solution {
 }
 ```
 
+### **TypeScript**
+
+```ts
+function triangleNumber(nums: number[]): number {
+    nums.sort((a, b) => a - b);
+    let n = nums.length;
+    let ans = 0;
+    for (let i = n - 1; i >= 2; i--) {
+        let left = 0, right = i - 1;
+        while (left < right) {
+            if (nums[left] + nums[right] > nums[i]) {
+                ans += (right - left);
+                right--;
+            } else {
+                left++;
+            }
+        }
+    }
+    return ans;
+};
+```
+
 ### **Go**
 
 ```go

solution/0600-0699/0611.Valid Triangle Number/README_EN.md

@@ -97,6 +97,28 @@ class Solution {
 }
 ```
 
+### **TypeScript**
+
+```ts
+function triangleNumber(nums: number[]): number {
+    nums.sort((a, b) => a - b);
+    let n = nums.length;
+    let ans = 0;
+    for (let i = n - 1; i >= 2; i--) {
+        let left = 0, right = i - 1;
+        while (left < right) {
+            if (nums[left] + nums[right] > nums[i]) {
+                ans += (right - left);
+                right--;
+            } else {
+                left++;
+            }
+        }
+    }
+    return ans;
+};
+```
+
 ### **Go**
 
 ```go

solution/0600-0699/0611.Valid Triangle Number/Solution.ts

@@ -0,0 +1,17 @@
+function triangleNumber(nums: number[]): number {
+    nums.sort((a, b) => a - b);
+    let n = nums.length;
+    let ans = 0;
+    for (let i = n - 1; i >= 2; i--) {
+        let left = 0, right = i - 1;
+        while (left < right) {
+            if (nums[left] + nums[right] > nums[i]) {
+                ans += (right - left);
+                right--;
+            } else {
+                left++;
+            }
+        }
+    }
+    return ans;
+};