UVA11995 I Can Guess the Data Structure!(数据结构,模拟)
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I Can Guess the Data Structure!
There is a bag-like data structure, supporting two operations:
1 x
Throw an element x into the bag.
2
Take out an element from the bag.
Given a sequence of operations with return values, you're going to guess the data structure. It is a stack (Last-In, First-Out), a queue (First-In, First-Out), a priority-queue (Always take out larger elements first) or something else that you can hardly imagine!
Input
There are several test cases. Each test case begins with a line containing a single integer n (1<=n<=1000). Each of the next n lines is either a type-1 command, or an integer 2 followed by an integer x. That means after executing a type-2 command, we get an element xwithout error. The value of x is always a positive integer not larger than 100. The input is terminated by end-of-file (EOF). The size of input file does not exceed 1MB.
Output
For each test case, output one of the following:
stack
It's definitely a stack.
queue
It's definitely a queue.
priority queue
It's definitely a priority queue.
impossible
It can't be a stack, a queue or a priority queue.
not sure
It can be more than one of the three data structures mentioned above.
Sample Input
6 1 1 1 2 1 3 2 1 2 2 2 3 6 1 1 1 2 1 3 2 3 2 2 2 1 2 1 1 2 2 4 1 2 1 1 2 1 2 2 7 1 2 1 5 1 1 1 3 2 5 1 4 2 4
Output for the Sample Input
queue not sure impossible stack priority queue
<span style="font-size:18px;">#include<iostream>#include<cstring>#include<algorithm>#include<queue>#include<stack>#include<cmath>#include<functional>using namespace std;stack<int>sta;queue<int>que;priority_queue<int,vector<int>,less<int> >pqu1;bool cun[4];int main(){ int n; int a,b; while(cin>>n) { memset(cun,true,sizeof(cun)); while(!sta.empty())sta.pop(); while(!que.empty())que.pop(); while(!pqu1.empty())pqu1.pop(); while(n--) { cin>>a>>b; if(a==1) { if(cun[1])sta.push(b); if(cun[2])que.push(b); if(cun[3])pqu1.push(b); } else { if(cun[1]&&!sta.empty()&&b==sta.top()) sta.pop(); else cun[1]=false; if(cun[2]&&!que.empty()&&b==que.front()) que.pop(); else cun[2]=false; if(cun[3]&&!pqu1.empty()&&b==pqu1.top()) pqu1.pop(); else cun[3]=false; } } int res=0; for(int i=1; i<5; i++) if(cun[i])res++; if(res==0)cout<<"impossible"<<endl; else if(res>=2)cout<<"not sure"<<endl; else if(cun[1])cout<<"stack"<<endl; else if(cun[2])cout<<"queue"<<endl; else cout<<"priority queue"<<endl; } return 0;}</span>
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