EasyNo. 1869
Longer Contiguous Segments of Ones than Zeros — LeetCode 1869 Python Solution
- Pattern
- Hash Map
- Topics
- String
- Reading time
- 3 min
- Source
- leetcode.com
The problem
Given a binary string s, return true if the longest contiguous segment of 1's is strictly longer than the longest contiguous segment of 0's in s, or return false otherwise. For example, in s = "110100010" the longest continuous segment of 1s has length 2, and the longest continuous segment of 0s has length 3.
Example
- Input
- s = "1101"
- Output
- true
- Explanation
- The longest contiguous segment of 1s has length 2: "1101"
Python solution
class Solution:
def checkZeroOnes(self, s: str) -> bool:
def f(x: str) -> int:
cnt = mx = 0
for c in s:
if c == x:
cnt += 1
mx = max(mx, cnt)
else:
cnt = 0
return mx
return f("1") > f("0")Complexity
- Time
- O(n), where n is the length of the string s
- Space · auxiliary
- $O(1)`
Pattern: Hash Map
Trade memory for time: remember what you have seen so the second pass never happens. LeetCode 1869. Longer Contiguous Segments of Ones than Zeros is filed here because the reference solution below belongs to the algorithm family this hub collects, even though its LeetCode tags point elsewhere.
The hash map guide has the Python template for the pattern and the 709 LeetCode problems that use it.
Related problems
| No. | Problem | Difficulty |
|---|---|---|
| 0006 | Zigzag Conversion | Medium |
| 0008 | String to Integer (atoi) | Medium |
| 0038 | Count and Say | Medium |
| 0058 | Length of Last Word | Easy |
| 0065 | Valid Number | Hard |
| 0068 | Text Justification | Hard |
Frequently asked questions
- How hard is LeetCode 1869. Longer Contiguous Segments of Ones than Zeros?
LeetCode 1869. Longer Contiguous Segments of Ones than Zeros is rated Easy on LeetCode.
- What is the time complexity of LeetCode 1869. Longer Contiguous Segments of Ones than Zeros?
The Python solution on this page runs in O(n), where n is the length of the string s.
- What is the space complexity of LeetCode 1869. Longer Contiguous Segments of Ones than Zeros?
The Python solution on this page uses $O(1)` auxiliary space.
- What topics does LeetCode 1869. Longer Contiguous Segments of Ones than Zeros cover?
LeetCode 1869. Longer Contiguous Segments of Ones than Zeros is tagged String on LeetCode.