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10845.java
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48 lines (43 loc) · 1.55 KB
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import java.io.*;
import java.util.LinkedList;
public class Main_10845 {
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 line = Integer.parseInt(br.readLine());
LinkedList<Integer> q = new LinkedList<Integer>();
while (line-- > 0) {
String[] cmd = br.readLine().split(" ");
if (cmd[0].equals("push")) {
q.add(Integer.parseInt(cmd[1]));
} else if (cmd[0].equals("pop")) {
if (q.size() == 0) {
bw.write("-1\n");
} else {
bw.write(q.remove(0) + "\n");
}
} else if (cmd[0].equals("front")) {
if (q.size() == 0) {
bw.write("-1\n");
} else {
bw.write(q.get(0) + "\n");
}
} else if (cmd[0].equals("back")) {
if (q.size() == 0) {
bw.write("-1\n");
} else {
bw.write(q.get(q.size() - 1) + "\n");
}
} else if (cmd[0].equals("size")) {
bw.write(q.size() + "\n");
} else if (cmd[0].equals("empty")) {
if (q.isEmpty()) {
bw.write("1\n");
} else {
bw.write("0\n");
}
}
}
bw.flush();
}
}