-
Notifications
You must be signed in to change notification settings - Fork 1
/
10828
57 lines (51 loc) · 1.15 KB
/
10828
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
import java.io.*;
import java.util.*;
public class Main {
public static void main(String[] args) throws Exception{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringBuilder sb = new StringBuilder();
int n = Integer.parseInt(br.readLine());
String s;
int[] arr = new int[n];
int cnt = 0;
for(int i = 0; i < n; i++) {
String[] str = br.readLine().split(" ");
if(str[0].equals("push")) {
arr[cnt++] = (Integer.parseInt(str[1]));
}else {
switch(str[0]) {
case "pop":
if(arr[0] == 0) {
// 비어있는 경우
sb.append(-1 + "\n");
}else {
sb.append(arr[cnt - 1] + "\n");
arr[cnt-- - 1] = 0;
}
break;
case "size":
sb.append(cnt + "\n");
break;
case "empty":
if(arr[0] == 0) {
// 비어있는 경우
sb.append(1 + "\n");
}else {
sb.append(0 + "\n");
}
break;
case "top":
if(arr[0] == 0) {
// 비어있는 경우
sb.append(-1 + "\n");
}else {
sb.append(arr[cnt - 1] + "\n");
}
break;
}
}
}
System.out.print(sb);
br.close();
}
}