Merge pull request youngyangyang04#1253 from xiaofei-2020/greed19

添加（0763.划分字母区间.md）：增加typescript版本

Author: youngyangyang04

problems/0763.划分字母区间.md

@@ -229,6 +229,31 @@ var partitionLabels = function(s) {
 };
 ```
 
+### TypeScript
+
+```typescript
+function partitionLabels(s: string): number[] {
+    const length: number = s.length;
+    const resArr: number[] = [];
+    const helperMap: Map<string, number> = new Map();
+    for (let i = 0; i < length; i++) {
+        helperMap.set(s[i], i);
+    }
+    let left: number = 0;
+    let right: number = 0;
+    for (let i = 0; i < length; i++) {
+        right = Math.max(helperMap.get(s[i])!, right);
+        if (i === right) {
+            resArr.push(i - left + 1);
+            left = i + 1;
+        }
+    }
+    return resArr;
+};
+```
+
+
+
 
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