practice in Python

Author: clingoram

python/index.py

@@ -268,3 +268,6 @@ def replaceDigits(s: str) -> str:
 # print(replaceDigits(s))
 
 
+a = [12,6,3]
+b = map(lambda x: x * 2, a)
+print(list(b))

python/leetcode/list/136.py

@@ -0,0 +1,21 @@
+def singleNumber(nums: List[int]) -> int:
+  '''
+  136. Single Number
+  '''
+  # 找出只出現一次的元素
+  # ans = 0
+  # for key,value in Counter(nums).items():
+  #   if(value == 1):
+  #     ans = key
+  # return ans
+
+  # solution 2
+  ans = 0
+  for i in nums:
+    ans ^= i
+  return ans
+
+
+nums = [4,1,2,1,2]
+# 4
+print(singleNumber(nums))