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Copy pathBOJ_10866.java
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71 lines (65 loc) · 2.23 KB
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package baekjoon.silver;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.StringTokenizer;
public class BOJ_10866 {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringBuilder sb = new StringBuilder();
StringTokenizer st;
int N = Integer.parseInt(br.readLine());
Deque<Integer> d = new ArrayDeque<>();
for (int i = 0; i < N; i++) {
st = new StringTokenizer(br.readLine());
String order = st.nextToken();
if(order.equals("push_back")) {
int num = Integer.parseInt(st.nextToken());
d.addLast(num);
} else if (order.equals("push_front")) {
int num = Integer.parseInt(st.nextToken());
d.addFirst(num);
} else if (order.equals("front")) {
if(d.isEmpty()) {
sb.append("-1\n");
}
else {
sb.append(d.peekFirst() + "\n");
}
} else if (order.equals("back")) {
if (d.isEmpty()) {
sb.append("-1\n");
}
else {
sb.append(d.peekLast() + "\n");
}
} else if (order.equals("size")) {
sb.append(d.size() + "\n");
} else if (order.equals("empty")) {
if(d.isEmpty()) {
sb.append("1\n");
}
else {
sb.append("0\n");
}
} else if (order.equals("pop_front")) {
if(d.isEmpty()) {
sb.append("-1\n");
}
else {
sb.append(d.pollFirst() + "\n");
}
} else if (order.equals("pop_back")) {
if(d.isEmpty()) {
sb.append("-1\n");
}
else {
sb.append(d.pollLast() + "\n");
}
}
}
System.out.println(sb);
}
}