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hdu 1702 ACboy needs your help again!

2024-07-14 22:48:22   222人阅读

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

题目大意：按照所给要求，输出相应的数。“FIFO”指代先进先出，即队列的概念，“FILO”指代先进后出，即栈的表现形式~这里定义两个函数即可，一个队列，一个栈的调用！

 1 #include <iostream> 2 #include <cstdio> 3 #include <queue> 4 #include <stack> 5 #include <cstring> 6 using namespace std; 7  8 int s,p,o,z,q; 9 char ch[105],str[105];10 11 int FIFO(int w)12 {13     queue<int>q,qq;14     for (int i=0; i<w; i++)15     {16         scanf("%s",ch);17         if (strcmp(ch,"IN")==0)18         {19             scanf("%d",&o);20             q.push(o);21         }22         else if (strcmp(ch,"OUT")==0)23         {24             if (!q.empty())25             {26                 s=q.front();27                 cout<<s<<endl;28                 q.pop();29             }30             else31                 cout<<"None"<<endl;32 33         }34     }35 }36 int FILO(int w)37 {38     stack<int>q,qq;39     for (int i=0; i<w; i++)40     {41         scanf("%s",ch);42         if (strcmp(ch,"IN")==0)43         {44             scanf("%d",&p);45             q.push(p);46         }47         else if (strcmp(ch,"OUT")==0)48         {49             if (!q.empty())50             {51                 z=q.top();52                 cout<<z<<endl;53                 q.pop();54             }55             else56                 cout<<"None"<<endl;57         }58     }59 }60 int main ()61 {62     int n,m;63     while (cin>>n)64     {65         while (n--)66         {67             scanf ("%d%s",&m,str);68             //scanf("%s %d",ch,m);69             if (strcmp(str,"FIFO")==0)70                 FIFO(m);71             else72                 FILO(m);73         }74     }75     return 0;76 }

 


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