125-valid-palindrome

DevGod

Vtuber

Caution

DevGod needs to write an editorial for this problem!

c

bool isPalindrome(char* s) {
    int I = 0;
    int Z = strlen(s)-1;
    while(I<strlen(s)-1 && Z > 0){
        while( (tolower(s[I]) < 97 || tolower(s[I]) > 122) && I<strlen(s)-1){I++;}
        while( (tolower(s[Z]) < 97 || tolower(s[Z]) > 122) && Z > 0){Z+=-1;}

        if( tolower(s[I]) != tolower(s[Z])){
            return false;
        }
        I++;
        Z += -1;
    }
    return true;
}

js

/**
 * @param {string} s
 * @return {boolean}
 */
var isPalindrome = function(s) {
    s = s.replace(/[^a-zA-Z0-9]/g, '').toLowerCase();
    let L = 0;
    let R = s.length-1;
    while(L<R){
        if(s[L] !== s[R]){
            return false;
        }
        L++;
        R += -1;
    }
    return true;
};