Merge pull request #1239 from xiaofei-2020/greed17

添加（0452.用最少数量的箭引爆气球.md）：增加typescript版本

problems/0452.用最少数量的箭引爆气球.md

@@ -214,7 +214,31 @@ var findMinArrowShots = function(points) {
 };
 ```
 
+### TypeScript
+
+```typescript
+function findMinArrowShots(points: number[][]): number {
+    const length: number = points.length;
+    if (length === 0) return 0;
+    points.sort((a, b) => a[0] - b[0]);
+    let resCount: number = 1;
+    let right: number = points[0][1];   // 右边界
+    let tempPoint: number[];
+    for (let i = 1; i < length; i++) {
+        tempPoint = points[i];
+        if (tempPoint[0] > right) {
+            resCount++;
+            right = tempPoint[1];
+        } else {
+            right = Math.min(right, tempPoint[1]);
+        }
+    }
+    return resCount;
+};
+```
+
 ### C 
+
 ```c
 int cmp(const void *a,const void *b)
 {