Function Call Simulation

Medium Stack: Applications PRO

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Problem Statement

Write a C program to simulate function call stacks tracking activation records or nested function IDs.

Input Format

First line contains n function calls/returns. Subsequent lines contain type (1 id for call, 2 for return).

Output Format

Print remaining active function IDs in the call stack from top to bottom separated by spaces.

Constraints

1 <= n <= 50

Sample Input

Sample Output

30 10

Explanation

Push function identifiers onto the call stack upon invocation and pop them upon function return.

Starter Code

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

int main() {
    int n;
    if (scanf("%d", &n) == 1) {
        // Write your code here to simulate function call stack
    }
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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