STL了解一下
C++ 代码
#include <iostream>
#include <cstdio>
#include <queue>
using namespace std;
queue < int > q;
int n;
string a;
int main()
{
scanf("%d", &n);
while(n --)
{
cin >> a;
if(a == "push")
{
int x;
scanf("%d", &x);
q.push(x);
}
else if(a == "pop") q.pop();
else if(a == "empty")
if(q.empty()) printf("YES\n");
else printf("NO\n");
else if(a == "query") printf("%d\n", q.front());
}
return 0;
}
hh