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DockiDockySnackGiver.java
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DockiDockySnackGiver.java
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package Baekjoon.DataStructure;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Stack;
import java.util.StringTokenizer;
// 6
// 6 4 2 1 3 5
// 24-08-28 40min
// https://www.acmicpc.net/problem/12789
public class DockiDockySnackGiver {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int peopleNum = Integer.parseInt(br.readLine());
StringTokenizer st = new StringTokenizer(br.readLine());
Stack<Integer> stk = new Stack<>();
int curOrder = 1;
for (int i = 0; i < peopleNum; i++) {
int order = Integer.parseInt(st.nextToken());
boolean isIn = false;
if (curOrder == order) {
curOrder++;
isIn = true;
}
while (!stk.isEmpty() && curOrder == stk.peek()) {
curOrder++;
stk.pop();
}
if (!isIn) {
stk.push(order);
}
}
while (!stk.isEmpty()) {
if (curOrder == stk.pop()) {
curOrder++;
} else {
System.out.println("Sad");
return;
}
}
System.out.println("Nice");
}
}