Create 10845_큐.cpp

BaekJoon/10845_큐.cpp

@@ -0,0 +1,41 @@
+#include <iostream>
+#include <queue>
+using namespace std;
+
+queue<int> q;
+void match(string para) {
+	if (para == "push") {
+		int x;
+		cin >> x;
+		q.push(x);
+	}
+	else if (para == "pop") {
+		if (q.empty()) cout << -1 << endl;
+		else { cout << q.front() << endl; q.pop(); }
+	}
+	else if (para == "size") {
+		cout << q.size() << endl;
+	}
+	else if (para == "empty") {
+		if (q.empty()) cout << 1 << endl;
+		else cout << 0 << endl;
+	}
+	else if (para == "front") {
+		if (q.empty()) cout << -1 << endl;
+		else cout << q.front() << endl;
+	}
+	else if (para == "back") {
+		if (q.empty()) cout << -1 << endl;
+		else cout << q.back() << endl;
+	}
+}
+int main() {
+	int N;
+	cin >> N;
+	string command;
+	for (int i = 0; i < N; ++i) {
+		cin >> command;
+		match(command);
+	}
+	return 0;
+}