baoshuo/OI-codes
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828. 模拟栈

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https://www.acwing.com/problem/content/submission/code_detail/6873731/
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Baoshuo Ren 2021-08-03 21:22:28 +08:00 committed by Baoshuo Ren
parent b7eb21c0f5
commit 03630f4f07
Signed by: baoshuo
GPG Key ID: 70F90A673FB1AB68
1 changed files with 22 additions and 0 deletions
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AcWing/828/828.cpp Normal file
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#include <bits/stdc++.h>
using namespace std;
int main() {
int m;
cin >> m;
stack<int> q;
while (m--) {
string op;
cin >> op;
if (op == "push") {
int x;
cin >> x;
q.push(x);
}
if (op == "pop") q.pop();
if (op == "empty") cout << (q.empty() ? "YES" : "NO") << endl;
if (op == "query") cout << q.top() << endl;
}
return 0;
}