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Commit 0fb1fea

JiayangWu JiayangWu

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2020年08月22日

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1544.整理字符串
- 1544-整理字符串.py
1545.找出第N个二进制字符串中的第K位
- 1545-找出第N个二进制字符串中的第K位.py
1546.和为目标值的最大数目不重叠非空子数组数目
- 1546-和为目标值的最大数目不重叠非空子数组数目.py

3 files changed

+57

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lines changed

`‎1544.整理字符串/1544-整理字符串.py‎`

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	`1`	`+class Solution(object):`
	`2`	`+ def makeGood(self, s):`
	`3`	`+ """`
	`4`	`+ :type s: str`
	`5`	`+ :rtype: str`
	`6`	`+ """`
	`7`	`+ stack = []`
	`8`	`+ for ch in s:`
	`9`	`+ if not stack or abs(ord(stack[-1]) - ord(ch)) != 32:`
	`10`	`+ stack.append(ch)`
	`11`	`+ else:`
	`12`	`+ stack.pop()`
	`13`	`+ return "".join(ch for ch in stack)`

`‎1545.找出第N个二进制字符串中的第K位/1545-找出第N个二进制字符串中的第K位.py‎`

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	`1`	`+class Solution(object):`
	`2`	`+ def findKthBit(self, n, k):`
	`3`	`+ """`
	`4`	`+ :type n: int`
	`5`	`+ :type k: int`
	`6`	`+ :rtype: str`
	`7`	`+ """`
	`8`	`+`
	`9`	`+ def invert(s):`
	`10`	`+ res = ""`
	`11`	`+ for ch in s:`
	`12`	`+ if ch == "0":`
	`13`	`+ res += "1"`
	`14`	`+ else:`
	`15`	`+ res += "0"`
	`16`	`+ return res`
	`17`	`+`
	`18`	`+ i = 1`
	`19`	`+ s = "0"`
	`20`	`+ while i < n:`
	`21`	`+ s = s + "1" + invert(s)[::-1]`
	`22`	`+ i += 1`
	`23`	`+ if k - 1 < len(s):`
	`24`	`+ return s[k - 1]`
	`25`	`+ return s[k - 1]`

`‎1546.和为目标值的最大数目不重叠非空子数组数目/1546-和为目标值的最大数目不重叠非空子数组数目.py‎`

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	`1`	`+class Solution(object):`
	`2`	`+ def maxNonOverlapping(self, nums, target):`
	`3`	`+ """`
	`4`	`+ :type nums: List[int]`
	`5`	`+ :type target: int`
	`6`	`+ :rtype: int`
	`7`	`+ """`
	`8`	`+ pre_sum = {0}`
	`9`	`+ res = 0`
	`10`	`+ s = 0`
	`11`	`+ for num in nums:`
	`12`	`+ s += num`
	`13`	`+ if s - target in pre_sum:`
	`14`	`+ res += 1`
	`15`	`+ s = 0`
	`16`	`+ pre_sum = {0}`
	`17`	`+ else:`
	`18`	`+ pre_sum.add(s)`
	`19`	`+ return res`

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