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Optimize 0020-valid-parentheses.java implementation with simplified condition logic #3015

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Merged
merged 1 commit into from
Sep 20, 2023
Merged

Optimize 0020-valid-parentheses.java implementation with simplified condition logic #3015

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8 changes: 3 additions & 5 deletions java/0020-valid-parentheses.java
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Original file line number Diff line number Diff line change
Expand Up @@ -8,15 +8,13 @@ public boolean isValid(String s) {
stack.isEmpty() &&
(s.charAt(i) == ')' || s.charAt(i) == '}' || s.charAt(i) == ']')
) return false; else {
if (!stack.isEmpty()) {
if (
stack.peek() == '(' && s.charAt(i) == ')'
s.charAt(i) == ')' && stack.peek() == '('
) stack.pop(); else if (
stack.peek() == '{' && s.charAt(i) == '}'
s.charAt(i) == '}' && stack.peek() == '{'
) stack.pop(); else if (
stack.peek() == '[' && s.charAt(i) == ']'
s.charAt(i) == ']' && stack.peek() == '['
) stack.pop(); else stack.add(s.charAt(i));
} else stack.add(s.charAt(i));
}
}
return stack.isEmpty();
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