HDU 1702 ACboy needs your help again!（栈 队列 基础）

#include<cstdio>
#include<cmath>
#include<queue>
#include<stack>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;
int t,n;
int main()
{
    int i,j,k;
    cin>>t;
    char op[10],io[10];
    while(t--)
    {
        scanf("%d%s",&n,op);
        if(op[2]=='F')
        {
            queue<int> q;
            while(n--)
            {
                scanf("%s",io);
                if(io[0]=='I')
                {
                    int temp;
                    scanf("%d",&temp);
                    q.push(temp);
                }
                else if(io[0]=='O')
                {
                    if(q.empty())
                    {
                        printf("None\n");
                    }
                    else
                    {
                        int temp=q.front();
                        q.pop();
                        printf("%d\n",temp);
                    }
                }
            }
        }
        else if(op[2]=='L')
        {
            stack<int> q;
            while(n--)
            {
                scanf("%s",io);
                if(io[0]=='I')
                {
                    int temp;
                    scanf("%d",&temp);
                    q.push(temp);
                }
                else if(io[0]=='O')
                {
                    if(q.empty())
                    {
                        printf("None\n");
                    }
                    else
                    {
                        int temp=q.top();
                        q.pop();
                        printf("%d\n",temp);
                    }
                }
            }
        }
    }

    return 0;
}