davidjsalazarmoreno

var n = 9;
var ar = [10, 20, 20, 10, 10, 30, 50, 10, 20]

function sockMerchant(n, arr) {
    const hash = new Map();
    let count = 0;

    for(let i = 0; i < n; i++) {
        const sock = arr[i];
        if (hash.get(sock) == 1) {