diff --git a/node_modules/.yarn-integrity b/node_modules/.yarn-integrity
new file mode 100644
index 00000000..29e4357c
--- /dev/null
+++ b/node_modules/.yarn-integrity
@@ -0,0 +1,10 @@
+{
+  "systemParams": "win32-x64-83",
+  "modulesFolders": [],
+  "flags": [],
+  "linkedModules": [],
+  "topLevelPatterns": [],
+  "lockfileEntries": {},
+  "files": [],
+  "artifacts": {}
+}
\ No newline at end of file
diff --git a/problems/0077.组合优化.md b/problems/0077.组合优化.md
index 81b4304c..94608ec1 100644
--- a/problems/0077.组合优化.md
+++ b/problems/0077.组合优化.md
@@ -240,7 +240,29 @@ var combine = function(n, k) {
 };
 ```
 
+TypeScript：
+
+```typescript
+function combine(n: number, k: number): number[][] {
+    let resArr: number[][] = [];
+    function backTracking(n: number, k: number, startIndex: number, tempArr: number[]): void {
+        if (tempArr.length === k) {
+            resArr.push(tempArr.slice());
+            return;
+        }
+        for (let i = startIndex; i <= n - k + 1 + tempArr.length; i++) {
+            tempArr.push(i);
+            backTracking(n, k, i + 1, tempArr);
+            tempArr.pop();
+        }
+    }
+    backTracking(n, k, 1, []);
+    return resArr;
+};
+```
+
 C:
+
 ```c
 int* path;
 int pathTop;
diff --git a/yarn.lock b/yarn.lock
new file mode 100644
index 00000000..3ff608ae
--- /dev/null
+++ b/yarn.lock
@@ -0,0 +1,4 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+