From 4689e4e80b479be25f7557d05818f5caa723aafa Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Wed, 5 Feb 2025 18:36:31 -0800
Subject: Initial commit.
---
.../easy/strings/05_valid_palindrome.cc | 30 ++++++++++++++++++++++
1 file changed, 30 insertions(+)
create mode 100644 top-interview-questions/easy/strings/05_valid_palindrome.cc
(limited to 'top-interview-questions/easy/strings/05_valid_palindrome.cc')
diff --git a/top-interview-questions/easy/strings/05_valid_palindrome.cc b/top-interview-questions/easy/strings/05_valid_palindrome.cc
new file mode 100644
index 0000000..1b4ca6f
--- /dev/null
+++ b/top-interview-questions/easy/strings/05_valid_palindrome.cc
@@ -0,0 +1,30 @@
+class Solution {
+public:
+ bool IsAlphaNum(char c) {
+ return
+ (('a' <= c) && (c <= 'z')) ||
+ (('A' <= c) && (c <= 'Z')) ||
+ (('0' <= c) && (c <= '9'));
+ }
+
+ void Transform(string& s) {
+ size_t j = 0;
+ for (size_t i = 0; i < s.size(); ++i) {
+ if (IsAlphaNum(s[i])) {
+ s[j] = std::tolower(s[i]);
+ j++;
+ }
+ }
+ s.resize(j);
+ }
+
+ bool isPalindrome(string s) {
+ Transform(s);
+ for (size_t i = 0; i < s.size()/2; ++i) {
+ if (s[i] != s[s.size()-i-1]) {
+ return false;
+ }
+ }
+ return true;
+ }
+};
--
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