[백준] - #10828: 스택

문제 출처 : https://www.acmicpc.net/

 

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#10828: 스택 (언어 : Java11)

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제출 답안

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Stack;

public class Main {
	static Stack<Integer> stack = new Stack<Integer>();
	
	public static void main(String[] args) throws NumberFormatException, IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int interval = Integer.parseInt(br.readLine());
		for(int i=0; i<interval; i++) {
			String command = br.readLine();
			switch (command) {
			case "top": System.out.println(myTop());
				break;
			case "empty": System.out.println(myEmpty());
				break;
			case "size" : System.out.println(mySize());
				break;
			case "pop" : System.out.println(myPop());
				break;
			default : myPush(Integer.parseInt(command.substring(command.indexOf(" ")+1)));
			}
		}
        br.close();
	}
	
	public static void myPush(int num) {
		stack.push(num);
	}
	
	public static int myPop() {
		int result = 0;
		if(stack.empty())
			result = -1;
		else
			result = stack.pop();
		return result;
	}
	
	public static int mySize() {
		int result = stack.size();
		return result;
	}
	
	public static int myEmpty() {
		int result = 0;
		if(stack.empty())
			result = 1;
		else
			result = 0;
		return result;
	}
	
	public static int myTop() {
		int result = 0;
		if(stack.empty())
			result = -1;
		else
			result = stack.peek();
		return result;
	}
}

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comment

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