代码来自蓝书第三章第一题,思路很清晰。主要实现过程中需要区分以下数据结构:
stack
queue
priority_queue
#include<cstdio>
#include<queue>
#include<stack>
#include<cstdlib>
using namespace std;
const int maxn = 1000 + 10;
int n, t[maxn], v[maxn];
int check_stack()
{
stack<int> s;
for(int i = 0; i < n; i++)
{
if(t[i] == 2)
{
if(s.empty()) return 0;
int x = s.top(); s.pop();
if(x != v[i]) return 0;
}
else s.push(v[i]);
}
return 1;
}
int check_queue()
{
queue<int> s;
for(int i = 0; i < n; i++)
{
if(t[i] == 2)
{
if(s.empty()) return 0;
int x = s.front(); s.pop();
if(x != v[i]) return 0;
}
else s.push(v[i]);
}
return 1;
}
int check_pq()
{
priority_queue<int> s;
for(int i = 0; i < n; i++)
{
if(t[i] == 2)
{
if(s.empty()) return 0;
int x = s.top(); s.pop();
if(x != v[i]) return 0;
}
else s.push(v[i]);
}
return 1;
}
int main()
{
while(scanf("%d", &n) == 1)
{
for(int i = 0; i < n; i++)
scanf("%d%d", &t[i], &v[i]);
int s = check_stack();
int q = check_queue();
int pq = check_pq();
if(!s && !q && !pq) printf("impossible\n");
else if(s && !q && !pq) printf("stack\n");
else if(!s && q && !pq) printf("queue\n");
else if(!s && !q && pq) printf("priority queue\n");
else printf("not sure\n");
}
return 0;
}
原文地址:https://www.cnblogs.com/ronnielee/p/9502561.html
时间: 2024-10-15 03:18:43