queue

// Online C++ compiler to run C++ program online
#include <iostream>
using namespace std;

int queue[10111];
int cur = 0;

void insert(int x) {
    cur++;
    queue[cur] = x;
}

void pop() {
    
    cur--;
    for (int i = 1; i <= cur; i++) {
        queue[i] = queue[i+1];
    }
}

bool isEmpty() {
    if (cur == 0) {
        return true;
    }
    return false;
}

void show() {
    
    for (int i = 1; i <= cur; i++) {
        
        cout << queue[i] << " ";
    }
    cout << endl;
}

int main() {
    // Write C++ code here
    insert(1);
    insert(2);
    insert(3);
    show();
    
    pop();
    show();
    
    while (!isEmpty()) {
        
        pop();
    }
    show();
    insert(5);
    show();
    
    return 0;
}