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Copy pathBOJ_10828.java
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56 lines (48 loc) · 1.59 KB
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package baekjoon.silver;
import java.io.*;
import java.util.Stack;
import java.util.StringTokenizer;
public class BOJ_10828 {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
StringTokenizer st;
int N = Integer.parseInt(br.readLine());
Stack<Integer> stack = new Stack<>();
for (int i = 0; i < N; i++) {
String order = br.readLine();
// push 명령
if(order.contains(" ")) {
st = new StringTokenizer(order);
st.nextToken();
int number = Integer.parseInt(st.nextToken());
stack.push(number);
continue;
}
// 나머지
if(order.equals("pop")) {
if(!stack.isEmpty())
bw.write(stack.pop() + "\n");
else
bw.write(-1 + "\n");
}
else if(order.equals("size")) {
bw.write(stack.size() + "\n");
}
else if(order.equals("empty")) {
if(stack.isEmpty())
bw.write(1 + "\n");
else
bw.write(0 + "\n");
}
else { // top
if(stack.isEmpty())
bw.write(-1 + "\n");
else
bw.write(stack.peek() + "\n");
}
}
bw.flush();
bw.close();
}
}