LeetCode 1700: Number of Students Unable to Eat Lunch Solution

Master LeetCode problem 1700 (Number of Students Unable to Eat Lunch), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

1700. Number of Students Unable to Eat Lunch

Easy

Array Stack Queue Simulation

Problem Explanation

Explanation:

We can simulate the process of students taking sandwiches by iterating over the students and sandwiches arrays.
We will keep track of the index of the next sandwich to be taken.
If a student prefers the current sandwich, they will take it and move to the next sandwich.
If a student does not prefer the current sandwich, they will be moved to the end of the queue.
We repeat this process until all students have either taken a sandwich or are unable to eat.
The number of students unable to eat is the remaining number of students in the queue.

Solution Code

class Solution {
    public int countStudents(int[] students, int[] sandwiches) {
        int[] count = new int[2];
        for (int student : students) {
            count[student]++;
        }
        
        for (int sandwich : sandwiches) {
            if (count[sandwich] == 0) {
                break;
            }
            count[sandwich]--;
        }
        
        return count[0] + count[1];
    }
}

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