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LeetCode solutions

1802. Number of Students Unable to Eat Lunch

My accepted Python solution to LeetCode problem 1802, Number of Students Unable to Eat Lunch, running in 3ms.

  • Difficulty: Easy
  • Python
  • Runtime 3ms
  • Memory 17.2MB

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 3ms, memory 17.2MB, accepted 2025-12-30.

python
class Solution:
    def countStudents(self, students: List[int], sandwiches: List[int]) -> int:
        from collections import Counter
        count = Counter(students)
        for sandwich in sandwiches:
            if count[sandwich] > 0:
                count[sandwich] -= 1
            else:
                break
        return count[0] + count[1]

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