Queue Using Two Stacks

Hard Queue: Advanced Types PRO

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Problem Statement

Write a C program to implement a queue using two stacks and process enqueue/dequeue queries.

Input Format

First line contains n queries. Subsequent lines contain query type (1 val for enqueue, 2 for dequeue and print dequeued value).

Output Format

Print dequeued values each on a new line.

Constraints

1 <= n <= 100

Sample Input

Sample Output

10
20

Explanation

Maintain s1 for enqueue operations and s2 for dequeue. Transfer elements from s1 to s2 when s2 is empty.

Starter Code

#include <stdio.h>
#include <stdlib.h>

int main() {
    int n;
    if (scanf("%d", &n) == 1) {
        // Write your code here to implement queue using two stacks
    }
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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