[Algorithm] 33 week(9.12 ~ 9.18) 2/3

409. Longest Palindrome

var longestPalindrome = function(s) {
    const set = new Set();
    
    let count = 0;
    
    for (const char of s) {
        if (set.has(char)) {
			count += 2;
            set.delete(char);
        } 
		else {
            set.add(char);
        }
    }

    return count + (set.size > 0 ? 1 : 0);    
};