MediumNo. 1904
The Number of Full Rounds You Have Played — LeetCode 1904 Python Solution
- Pattern
- Math and Number Theory
- Topics
- Math, String
- Reading time
- 2 min
- Source
- leetcode.com
The problem
You are participating in an online chess tournament. There is a chess round that starts every 15 minutes.
Example
- Input
- loginTime = "09:31", logoutTime = "10:14"
- Output
- 1
- Explanation
- You played one full round from 09:45 to 10:00.
Python solution
class Solution:
def numberOfRounds(self, loginTime: str, logoutTime: str) -> int:
def f(s: str) -> int:
return int(s[:2]) * 60 + int(s[3:])
a, b = f(loginTime), f(logoutTime)
if a > b:
b += 1440
a, b = (a + 14) // 15, b // 15
return max(0, b - a)Complexity
- Time
- O(1)
- Space · auxiliary
- O(1)
Pattern: Math and Number Theory
Find the closed form, the invariant, or the modular identity — and skip the loop entirely. LeetCode 1904. The Number of Full Rounds You Have Played is filed here on both counts: the reference solution below belongs to the algorithm family this hub collects, and LeetCode tags it Math.
The math and number theory guide has the Python template for the pattern and the 485 LeetCode problems that use it.
Related problems
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|---|---|---|
| 0043 | Multiply Strings | Medium |
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| 0412 | Fizz Buzz | Easy |
| 0415 | Add Strings | Easy |
Frequently asked questions
- How hard is LeetCode 1904. The Number of Full Rounds You Have Played?
LeetCode 1904. The Number of Full Rounds You Have Played is rated Medium on LeetCode.
- What is the time complexity of LeetCode 1904. The Number of Full Rounds You Have Played?
The Python solution on this page runs in O(1).
- What is the space complexity of LeetCode 1904. The Number of Full Rounds You Have Played?
The Python solution on this page uses O(1) auxiliary space.
- What topics does LeetCode 1904. The Number of Full Rounds You Have Played cover?
LeetCode 1904. The Number of Full Rounds You Have Played is tagged Math and String on LeetCode.