NTHU OJ

NTHU OJ - 5711 Queue (Use C++ Standard Library).cpp

//This program is for NTHU 5711 Queue
//Problem link: http://140.114.86.38/problem.php?pid=5711
 
#include<stdio.h>
#include<queue>
#include<string.h>
using namespace std;
 
queue<int> q;
 
void queueClear()
{
    while( !q.empty())
        q.pop();
}
 
void queueFront()
{
    if(q.size() == 0)
        printf("EMPTY\n");
    else
        printf("%d\n", q.front());
}
 
void queuePush(int n)
{
    q.push(n);
}
 
void queuePop()
{
    if( !q.empty())
        q.pop();
}
 
void queueAction(char action[])
{
    if(strcmp(action, "front") == 0)
        queueFront();
    else if(strcmp(action, "push") == 0)
    {
        int tmp;
        scanf("%d", &tmp);
        queuePush(tmp);
    }
    else if(strcmp(action, "pop") == 0)
        queuePop();
}
 
 
int main()
{
    char oper[5];
 
    queueClear();
 
    while(scanf("%s", &oper) != EOF)
    {
        queueAction(oper);
    }
    return 0;
}