fork download
copy 
  1. #include<bits/stdc++.h>
  2. #include<iostream>
  3. // #include<queue>
  4. using namespace std;
  5.  
  6. int main() {
  7.     int t;
  8.     cin>>t;
  9.  
  10.     pair<int,int> pair1;
  11.     queue<int>q;
  12.  
  13.     while(t--) {
  14.         cin>>pair1.first>>pair1.second;
  15.         if(pair1.first==1) {
  16.             q.push(pair1.second);
  17.         }else if(pair1.first==2) {
  18.             q.pop();
  19.         }else if(pair1.first==3) {
  20.             cout<<q.front()<<endl;
  21.         }else if(q.empty()) {
  22.             cout<<"Empty!"<<endl;
  23.         }
  24.         cout<<q.front()<<endl;
  25.     }
  26.  
  27. }
  28.  
Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin
copy 
6
1 5
1 6
2
3
2
3
stdout
copy 
5
5
6
0
0
0
https://ideone.com/0Z1CRQ
language:
C++ (gcc 8.3)
created:
22 hours ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!