[JAVA] 백준 17298번

17298번

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.Stack;
import java.util.StringTokenizer;

public class Main {

	public static void main(String[] args) throws IOException {

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

		int N = Integer.parseInt(br.readLine());

		Stack<Integer> originStack = new Stack<Integer>();
		Stack<Integer> maxStack = new Stack<Integer>();
		Stack<Integer> NGEStack = new Stack<Integer>();

		StringTokenizer st = new StringTokenizer(br.readLine());
		StringBuilder sb = new StringBuilder();

		for (int i = 0; i < N; i++) {
			originStack.push(Integer.parseInt(st.nextToken()));
		}

		while (!originStack.empty()) {

			int origin = originStack.peek();

			if (maxStack.empty()) {
				NGEStack.push(-1);
				maxStack.push(originStack.pop());
			} else {

				if (origin < maxStack.peek()) {
					NGEStack.push(maxStack.peek());
					maxStack.push(originStack.pop());
				} else {
					maxStack.pop();
				}

			}

		}

		while (!NGEStack.empty()) {
			sb.append(NGEStack.pop()).append(" ");
		}

		bw.write(sb.toString());
		bw.flush();
		bw.close();
	}

}

기존에 스택을 사용하지 안고 이중for문을 사용하여 시간초과 오류가 났다.