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LeetCode solutions

1203. Print in Order

My accepted Python solution to LeetCode problem 1203, Print in Order, running in 50ms.

  • Difficulty: Easy
  • Python
  • Runtime 50ms
  • Memory 18MB

Read the problem on LeetCode View on GitHub

The problem statement is LeetCode’s and stays on their site. What follows is my accepted solution.

Python

Accepted on LeetCode — runtime 50ms, memory 18MB, accepted 2025-12-29.

python
import threading

class Foo:
    def __init__(self):
        self.first_done = threading.Event()
        self.second_done = threading.Event()

    def first(self, printFirst: 'Callable[[], None]') -> None:
        printFirst()
        self.first_done.set()

    def second(self, printSecond: 'Callable[[], None]') -> None:
        self.first_done.wait()
        printSecond()
        self.second_done.set()

    def third(self, printThird: 'Callable[[], None]') -> None:
        self.second_done.wait()
        printThird()

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