HDU 1702 ACboy needs your help again!（模拟两种数据结构）

题目链接：http://acm.hdu.edu.cn/showproblem.php?pid=1702

ACboy needs your help again!

Time Limit: 1000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 5984 Accepted Submission(s): 3135

Problem Description
ACboy was kidnapped!!
he miss his mother very much and is very scare now.You can’t image how dark the room he was put into is, so poor :(.
As a smart ACMer, you want to get ACboy out of the monster’s labyrinth.But when you arrive at the gate of the maze, the monste say :” I have heard that you are very clever, but if can’t solve my problems, you will die with ACboy.”
The problems of the monster is shown on the wall:
Each problem’s first line is a integer N(the number of commands), and a word “FIFO” or “FILO”.(you are very happy because you know “FIFO” stands for “First In First Out”, and “FILO” means “First In Last Out”).
and the following N lines, each line is “IN M” or “OUT”, (M represent a integer).
and the answer of a problem is a passowrd of a door, so if you want to rescue ACboy, answer the problem carefully!

Input
The input contains multiple test cases.
The first line has one integer,represent the number oftest cases.
And the input of each subproblem are described above.

Output
For each command “OUT”, you should output a integer depend on the word is “FIFO” or “FILO”, or a word “None” if you don’t have any integer.

Sample Input
4
4 FIFO
IN 1
IN 2
OUT
OUT
4 FILO
IN 1
IN 2
OUT
OUT
5 FIFO
IN 1
IN 2
OUT
OUT
OUT
5 FILO
IN 1
IN 2
OUT
IN 3
OUT

Sample Output
1
2
2
1
1
2
None
2
3

【思路分析】实现告诉你是哪种数据结构，然后让你根据这种数据结构的特性去模拟过程。

【AC代码】

#include<cstdio>#include<cstring>#include<stack>#include<queue>#include<algorithm>using namespace std;stack<int> s ;queue<int> q;int main(){    int n,t,a;    char str1[105],str2[105];    while(scanf("%d",&t)!=EOF)    {        while(t--)        {            scanf("%d%s",&n,str1);            if(strcmp(str1,"FIFO")==0)            {                while(!q.empty())                {                    q.pop();                }                while(n--)                {                    scanf("%s",str2);                    if(str2[0]=='I')                    {                        scanf("%d",&a);                        q.push(a);                    }                    else                    {                        if(!q.empty())                        {                            printf("%d\n",q.front());                            q.pop();                        }                        else                            printf("None\n");                    }                }            }            else            {                while(!s.empty())                {                    s.pop();                }                while(n--)                {                    scanf("%s",str2);                    if(str2[0]=='I')                    {                        scanf("%d",&a);                        s.push(a);                    }                    else                    {                        if(!s.empty())                        {                            printf("%d\n",s.top());                            s.pop();                        }                        else                            printf("None\n");                    }                }            }        }    }    return 0;}