blacksheep557

console.log(firstRepeat("legolas"))
console.log(firstRepeat("Gandalf"))
console.log(firstRepeat("Balrog"))
console.log(firstRepeat("Isildur"))
function firstRepeat(str) {
  const seen = {};
  for (let char of str) {
    if(seen[char]) return char
    seen[char] = 1

blacksheep557

// isPositiveDominant([1, 1, 1, 1, -3, -4])// false
// // There is only 1 unique positive value (1).
// // There are 2 unique negative values (-3, -4).

// isPositiveDominant([5, 99, 832, -3, -4])// true

// isPositiveDominant([5, 0])// true

isPositiveDominant([0, -4, -1])// false
function isPositiveDominant(arr) {

blacksheep557

function sortByLength(arr = []) {
  for (let j = 0; j < arr.length; j++) {
    for (let i = 0; i < arr.length - j; i++) {
      const [x, y] = [arr[i], arr[i + 1]]
      if (arr[i + 1] && arr[i].length > arr[i + 1].length) swap(arr, i, i + 1)
    }
  }
  console.log(arr)
  return arr

blacksheep557

function nQueenPlacement(board) {
  let rowPositions = [];
  let colPositions = [];
  for (let i = 0; i < board.length; i++) {
    for (let j = 0; j < board[i].length; j++) {
      if (board[i][j] === 1) {
        if (rowPositions.indexOf(i) === -1 && colPositions.indexOf(j) === -1 && pairModulusDiffers(rowPositions, colPositions, i, j)) {
          rowPositions.push(i);
          colPositions.push(j);

blacksheep557

function decipherThis(string) {
  const words = string.split(' ');
  return words.map(word => decode(word.split(''))).join(' ');
}
function decode(wordArr) {
  let hex = ''
  let secChar
  for (let [idx, char] of wordArr.entries()) {

    if (Number(char) || char == 0) {

blacksheep557

 function fold(arr) {
   let start = 0;
   let end = arr.length - 1;
   const res = []
   while (start < end) {
     res.push(arr[start] + arr[end]);
     start++;
     end--;
   }
   if (arr.length % 2 === 1) res.push(arr[start])

blacksheep557

function onesInfection(matrix) {
  const rowSet = new Set()
  const colSet = new Set()
  for (let i = 0; i < matrix.length; i++) {
    for (let j = 0; j < matrix[i].length; j++) {
      if (matrix[i][j] == 1) {
        rowSet.add(i)
        colSet.add(j)
      }
    }

blacksheep557

const country_codes_array = ["AF","AL","DZ","AS","AD","AO","AI","AQ","AG","AR","AM","AW","AU","AT","AZ","BS","BH","BD","BB","BY","BE","BZ","BJ","BM","BT","BO","BQ","BA","BW","BV","BR","IO","BN","BG","BF","BI","KH","CM","CA","CV","KY","CF","TD","CL","CN","CX","CC","CO","KM","CG","CD","CK","CR","HR","CU","CW","CY","CZ","CI","DK","DJ","DM","DO","EC","EG","SV","GQ","ER","EE","ET","FK","FO","FJ","FI","FR","GF","PF","TF","GA","GM","GE","DE","GH","GI","GR","GL","GD","GP","GU","GT","GG","GN","GW","GY","HT","HM","VA","HN","HK","HU","IS","IN","ID","IR","IQ","IE","IM","IL","IT","JM","JP","JE","JO","KZ","KE","KI","KP","KR","KW","KG","LA","LV","LB","LS","LR","LY","LI","LT","LU","MO","MK","MG","MW","MY","MV","ML","MT","MH","MQ","MR","MU","YT","MX","FM","MD","MC","MN","ME","MS","MA","MZ","MM","NA","NR","NP","NL","NC","NZ","NI","NE","NG","NU","NF","MP","NO","OM","PK","PW","PS","PA","PG","PY","PE","PH","PN","PL","PT","PR","QA","RO","RU","RW","RE","BL","SH","KN","LC","MF","PM","VC","WS","SM","ST","SA","SN","RS","SC","SL","SG",

blacksheep557

function maxSubarray(arr, k) {
  if (arr.length < k) return 0
  let currSubSum = arr.slice(0, k).reduce((a, b) => a + b);
  let sum = currSubSum;
  for (let i = k; i < arr.length; i++) {
    currSubSum = currSubSum + arr[i] - arr[i - k]
    sum = Math.max(sum, currSubSum)
  }
  return sum
}

blacksheep557

function getMaxProfit(array) {
  let profit = 0;
  for (let i = 0; i < array.length; i++) {
    let max = array[i]
    for (let j = i + 1; j < array.length; j++) {
      if (max < array[j]) max = array[j]
    }
    profit += max - array[i]
  }
  return profit