Merge pull request #244 from jojoo15/patch-22

添加 0216.组合总数 python3版本

problems/0216.组合总和III.md

@@ -262,7 +262,25 @@ class Solution {
 ```
 
 Python：
+```python3
+class Solution:
+    def combinationSum3(self, k: int, n: int) -> List[List[int]]:
+        res = []  #存放结果集
+        path = []  #符合条件的结果
+        def findallPath(n,k,sum,startIndex):
+            if sum > n: return  #剪枝操作
+            if sum == n and len(path) == k:  #如果path.size() == k 但sum != n 直接返回
+                return res.append(path[:])
+            for i in range(startIndex,9-(k-len(path))+2):  #剪枝操作
+                path.append(i)
+                sum += i 
+                findallPath(n,k,sum,i+1)  #注意i+1调整startIndex
+                sum -= i  #回溯
+                path.pop()  #回溯
         
+        findallPath(n,k,0,1)
+        return res
+```
 
 Go：