/
Solution.java
43 lines (42 loc) · 1.25 KB
/
Solution.java
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
class Solution {
public boolean isValid(String s) {
Stack<Character> cStack = new Stack<>();
boolean ans = true;
for (char c : s.toCharArray()) {
if (!ans) {
break;
}
switch (c) {
case '(':
case '[':
case '{':
cStack.add(c);
break;
case ')':
if (cStack.isEmpty()) {
ans = false;
} else if (!cStack.pop().equals('(')) {
ans = false;
}
break;
case ']':
if (cStack.isEmpty()) {
ans = false;
} else if (!cStack.pop().equals('[')) {
ans = false;
}
break;
case '}':
if (cStack.isEmpty()) {
ans = false;
} else if (!cStack.pop().equals('{')) {
ans = false;
}
break;
default:
break;
}
}
return ans && cStack.isEmpty();
}
}