Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.
For example,
"A man, a plan, a canal: Panama" is a palindrome."race a car" is not a palindrome.1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | bool isPalindrome(char* s) { int i, j, len; len = strlen(s); i = 0; j = len - 1; while(i < j){ // skip non alpha chars from start while(i < len && !isalnum(s[i])){ i++; } // skip non alpha chars from end while(j >= 0 && !isalnum(s[j])){ j--; } if(i < j && tolower(s[i]) != tolower(s[j])){ return false; } i++; j--; } return true; } |
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Great explanation of valid palindromes! It's fascinating how games like BetterJoy often play with symmetry and patterns, making coding challenges even more fun!
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