✨ upload T78 python solution

Author: InnoFang

LeetCode/0078. Subsets/solution.py

@@ -0,0 +1,16 @@
+"""
+10 / 10 test cases passed.
+Runtime: 52 ms
+Memory Usage: 15.1 MB
+"""
+class Solution:
+    def subsets(self, nums: List[int]) -> List[List[int]]:
+        ans, path = [], []
+        def backtrack(start, path):
+            ans.append(path[:])
+            for i in range(start, len(nums)):
+                path.append(nums[i])
+                backtrack(i + 1, path)
+                path.pop();
+        backtrack(0, path)
+        return ans