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[ymir0804] WEEK 06 solutions #2212

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Merged
TonyKim9401 merged 1 commit into from
Dec 22, 2025
Merged

[ymir0804] WEEK 06 solutions #2212

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28 changes: 28 additions & 0 deletions valid-palindrome/ymir0804.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,28 @@
class Solution {
public boolean isPalindrome(String s) {
String cleaned = s.replaceAll("[^a-zA-Z0-9]", "").toLowerCase();
if (cleaned.length() == 1 || cleaned.length() == 0) {
return true;
} else if(cleaned.length() ==2) {
return cleaned.charAt(0) == cleaned.charAt(1);
}
int length = cleaned.length();
int mid = length / 2;

String leftPart;
String rightPart;

if (length % 2 == 1) {
leftPart = cleaned.substring(0, mid);
rightPart = cleaned.substring(mid + 1, length);
} else {
leftPart = cleaned.substring(0, mid);
rightPart = cleaned.substring(mid, length);
}

String reversedRightPart = new StringBuilder(rightPart).reverse().toString();

return leftPart.equals(reversedRightPart);

}
}