[백준/자바] 17298 - 오큰수

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
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));
        int N = Integer.parseInt(br.readLine());

        int[] arr = new int[N];
        int[] result = new int[N];
        Stack<Integer> stack = new Stack<>();

        StringTokenizer st = new StringTokenizer(br.readLine());
        for(int i=0; i<N; i++) {
            arr[i] = Integer.parseInt(st.nextToken());
        }

        stack.push(0);
        for(int i=1; i<N; i++) {
            while (!stack.isEmpty() && arr[i] > arr[stack.peek()]) {
                result[stack.pop()] = arr[i];
            }
            stack.push(i);
        }

        while(!stack.isEmpty()) {
            result[stack.pop()] = -1;
        }

        StringBuilder sb = new StringBuilder();
        for(int num : result) {
            sb.append(num + " ");
        }

        System.out.println(sb);
        br.close();
    }
}