BOJ 10845번 :: 큐

#문제

https://www.acmicpc.net/problem/10845

10845번: 큐

 

#작성 코드

#include <iostream>
using namespace std;
 
typedef class queue{
    private:
    int qsize=-1;
    int data[10001];
    public:
    void push(int x){
        qsize++;
        data[qsize] = x;
    }
    void pop(){
        if( qsize==-1 ){
            cout<<-1<<'\n';
            return;
        }
        cout<<data[0]<<'\n';
        for(int i=1; i<=qsize; i++){
            data[i-1] = data[i];
        }
        qsize--;
    }
    void size(){
        cout<<qsize+1<<'\n';
    }
    void empty(){
        if( qsize==-1 ) cout<<1<<'\n';
        else cout<<0<<'\n';
    }
    void front(){
        if( qsize==-1){
            cout<<-1<<'\n';
            return;
        }
        cout<<data[0]<<'\n';
    }
    void back(){
        if( qsize==-1){
            cout<<-1<<'\n';
            return;
        }
        cout<<data[qsize]<<'\n';
    }
}queue; 
 
int main(){
    int n;
    cin>>n;
    queue q;
    // n개의 명령어 입력 
    for(int i=0; i<n; i++){
        string com;
        int num;
        cin>>com;
        if(com=="push"){
            cin>>num;
            q.push(num);
        }
        else if(com=="pop"){
            q.pop();
        }
        else if(com=="size"){
            q.size();
        }
        else if(com=="empty"){
            q.empty();
        }
        else if(com=="front"){
            q.front();
        }
        else if(com=="back"){
            q.back();
        }
    }
    return 0;
}

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