feat: 新增0077组合python、JavaScript解法

problems/0077.组合.md

@@ -370,8 +370,45 @@ class Solution {
 
 
 Python：
+```python
+class Solution:
+    result: List[List[int]] = []
+    path: List[int] = []
+    def combine(self, n: int, k: int) -> List[List[int]]:
+      self.result = []
+      self.combineHelper(n, k, 1)
+      return self.result
 
-
+    def combineHelper(self, n: int, k: int, startIndex: int):
+      if  (l := len(self.path)) == k:
+        self.result.append(self.path.copy())
+        return
+      for i in range(startIndex, n - (k - l) + 2):
+        self.path.append(i)
+        self.combineHelper(n, k, i + 1)
+        self.path.pop()
+```
+javascript
+```javascript
+let result = []
+let path = []
+var combine = function(n, k) {
+  result = []
+  combineHelper(n, k, 1)
+  return result
+};
+const combineHelper = (n, k, startIndex) => {
+  if (path.length === k) {
+    result.push([...path])
+    return
+  }
+  for (let i = startIndex; i <= n - (k - path.length) + 1; ++i) {
+    path.push(i)
+    combineHelper(n, k, i + 1)
+    path.pop()
+  }
+}
+```
 Go：
 ```Go
 var res [][]int