update

chapter3/13_sliding-window-maximum.py

@@ -31,7 +31,7 @@
 #######################################################################################
 
 import collections
-    
+
 
 class Solution:
     def maxSlidingWindow(self, nums, k):
@@ -105,9 +105,28 @@ class Solution:
 
         return res
 
+    def maxSlidingWindow2(self, nums, k):
+        if not nums:
+            return []
+        window, res = [], []
+
+        for i, x in enumerate(nums):
+            if i >= k and window[0] <= i - k:
+                window.pop(0)
+            while window and nums[window[-1]] <= x:
+                window.pop()
+            window.append(i)
+            if i >= k - 1:
+                res.append(nums[window[0]])
+        return res
+
 
 if __name__ == '__main__':
     solution = Solution()
     print(solution.maxSlidingWindow([1, 3, -1, -3, 5, 3, 6, 7], 3), "= \n[3, 3, 5, 5, 6, 7]")
     print(solution.maxSlidingWindow([1, 3, 1, 2, 0, 5], 3), "= \n[3, 3, 2, 5]")
     print(solution.maxSlidingWindow([9, 10, 9, -7, -4, -8, 2, -6], 5), "= \n[10, 10, 9, 2]")
+
+    print(solution.maxSlidingWindow2([1, 3, -1, -3, 5, 3, 6, 7], 3), "= \n[3, 3, 5, 5, 6, 7]")
+    print(solution.maxSlidingWindow2([1, 3, 1, 2, 0, 5], 3), "= \n[3, 3, 2, 5]")
+    print(solution.maxSlidingWindow2([9, 10, 9, -7, -4, -8, 2, -6], 5), "= \n[10, 10, 9, 2]")

chapter3/15_3sum.py

@@ -35,7 +35,6 @@ class Solution:
                 a. 用一个字典记录已经访问过的值及其下标
                 b. 如果访问到某个值num[i]是，发现其匹配值target - nums[i] 出现在dict里面，表示其左边有一个是可以与nums[i]想加得target，
                    此时返回[dict[nums[i]], i]即为结果
-        4. 过程中使用set对结果集去重，保证没有重复的三元组
         """
 
         # 特判，过滤掉数组元素不够三个的情况

chapter3/8_reverse-linked-list.py

@@ -19,7 +19,7 @@ class ListNode:
     def __init__(self, x):
         self.val = x
         self.next = None
-    
+
     def __repr__(self):
         if self:
             return "{}->{}".format(self.val, repr(self.next))
@@ -42,6 +42,7 @@ class Solution:
             head.next, cur, head = cur, head, head.next
         return cur
 
+
 if __name__ == '__main__':
     head = ListNode(1)
     head.next = ListNode(2)