11995
I Can Guess the Data Structure!
There is a bag-like data structure, supporting two operations:priority queue
/*
Author: 2486
Memory: 0 KB Time: 18 MS
Language: C++ 4.8.2 Result: Accepted
*/
//将所有的STL分别进行判断就可以了
#include <iostream>
#include <string>
#include <algorithm>
#include <stack>
#include <queue>
#include <cstdio>
#include <cstring>
using namespace std;
int n,cmd,dig;
bool isstack,isque,isprique;
stack<int>sta;
queue<int>que;
priority_queue<int>prique;
int main() {
#ifndef ONLINE_JUDGE
freopen("D://imput.txt","r",stdin);
#endif // ONLINE_JUDGE
while(~scanf("%d",&n)) {
while(!sta.empty())sta.pop();
while(!que.empty())que.pop();
while(!prique.empty())prique.pop();
isstack=true,isque=true,isprique=true;
for(int i=0; i<n; i++) {
scanf("%d%d",&cmd,&dig);
if(isstack) {
if(cmd==1) {
sta.push(dig);
} else {
if(sta.empty()) {
isstack=false;
while(!sta.empty())sta.pop();
} else {
int v=sta.top();
if(v==dig) {
sta.pop();
} else {
isstack=false;
while(!sta.empty())sta.pop();
}
}
}
}
if(isque) {
if(cmd==1) {
que.push(dig);
} else {
if(que.empty()) {
isque=false;
while(!que.empty())que.pop();
} else {
int v=que.front();
if(v==dig) {
que.pop();
} else {
isque=false;
while(!que.empty())que.pop();
}
}
}
}
if (isprique) {
if(cmd==1) {
prique.push(dig);
} else {
if(prique.empty()) {
isprique=false;
while(!prique.empty())prique.pop();
} else {
int v=prique.top();
if(v==dig) {
prique.pop();
} else {
isprique=false;
while(!prique.empty())prique.pop();
}
}
}
}
}
if(isstack+isque+isprique==1) {
if(isstack)printf("stack");
else if(isque)printf("queue");
else printf("priority queue");
} else if(isstack+isque+isprique==0) {
printf("impossible");
} else {
printf("not sure");
}
printf("\n");
}
return 0;
}UVA 11995 I Can Guess the Data Structure!
原文：http://blog.csdn.net/qq_18661257/article/details/46593113