Notes

function checkIP (arr) {
const result = [];

for (let str of arr) {
if (checkIPv6(str)) {
result.push('IPv6');
continue;
}

if (checkIPv4(str)) {
result.push('IPv4');
continue;
}

result.push('Neither');
}

return result;
}

function checkIPv6(str) {
let strArr = str.split(':');

if (strArr.length !== 8) {
return false;
}

for (let str of strArr) {
if (str.length > 4 || str.length === 0) {
return false;
}

for (let ch of str) {
if (!ch.match(/[a-f0-9]+/i)) {
return false;
}
}
}

return true;
}

function checkIPv4(str) {
let strArr = str.split('.');

if (strArr.length !== 4 || str.length === 0) {
return false;
}

for (let str of strArr) {
const num = Number(str);
if (Number.isNaN(num) || num < 0 || num > 255) {
return false;
}
}

return true;
}
var a = [
'2001:0db8:0000:0000:0000:ff00:0042:8329',
'172.16.254.1',
'222.223.240.298',
'222.223.240.222a',
]

console.log(checkIP(a));

function decrypt(str) {
const key = '2512208'.split('').map(Number);
let result = new Array(str.length);

for (let i = 0, j = 0; i < str.length; i++) {
if (!str[i].match(/[a-zA-Z]/)) {
result[i] = str[i];
continue;
}

let charCode = str.charCodeAt(i);
if (charCode > 96) {
charCode = (charCode - key[j] - 97 + 26) % 26 + 97;
} else {
charCode = (charCode - key[j] - 65 + 26) % 26 + 65;
}

result[i] = String.fromCharCode(charCode);
j = (j + 1) % key.length;
}

return result.join('');
}

var a = '-Atvt hrqgse, Cnikg';
console.log(decrypt(a));
// var a = 'Otjfvknou kskgnl, K mbxg iurtsvcnb ksgq hoz atv. Vje xcxtyqrl vt ujg smewfv vrmcxvtg rwqr ju vhm ytsf elwepuqyez. -Atvt hrqgse, Cnikg';
// console.log(decrypt(a));

function informationMasking(input) {
input = input.trim();
if (input[0] === 'E') {
const firstCharIndex = input.slice(2).search(/[a-zA-z0-9!#$%&'*+-/=?^`{|}~]/, 2) + 2;
const emailIndex = input.lastIndexOf('@');
return input.slice(0, firstCharIndex + 1) + '*****' + input.slice(emailIndex - 1);
}

if (input[0] === 'P') {
const result = [];
const numbers = input.match(/[0-9]/g);

let i = numbers.length - 1;
if (i >= 4) {
result.push(numbers[i--]);
result.push(numbers[i--]);
result.push(numbers[i--]);
result.push(numbers[i--]);
}

while (i >= 2) {
result.push('-');
result.push('*');
result.push('*');
result.push('*');
i -= 3;
}

while (i >= 0) {
result.push('*');
i--;
}


if (input.indexOf('+') != -1) {
result.push('+');
}

return result.reverse().join('');
}
}

var a = 'E: [email protected]'
console.log(informationMasking(a));
var a = 'P: +13334445678'
console.log(informationMasking(a));
var a = 'P: +1 (333) 444-5678'
console.log(informationMasking(a));
var a = 'P: +91 (333) 444-5678'
console.log(informationMasking(a));
var a = 'P: +111 (333) 444-5678'
console.log(informationMasking(a));
var a = 'P: 333 444-5678'
console.log(informationMasking(a));
var a = 'P: (333) 444-5678'
console.log(informationMasking(a));

function maxLength(a, k) {
let max = 0;
let start = 0;
let cur = 0;

for (let i = 0; i < a.length; i++) {
cur += a[i];

while (cur > k && start <= i) {
cur -= a[start++];
}

if (cur === k) {
return cur;
}

if (cur > max && cur < k) {
max = cur;
}
}

return max;
}

var a = [1, 22, 3, 4, 5, 1];
console.log(maxLength(a, 13));

function getRecommendedTweets(fG, lG, targetUser, minLikeThreshold) {
const userFollows = {};
const tweetLikes = {};

for (let tuple of fG) {
if (tuple[0] === targetUser) {
userFollows[tuple[1]] = true;
}
}

for (let tuple of lG) {
if (userFollows[tuple[0]]) {
tweetLikes[tuple[1]] = ++tweetLikes[tuple[1]] || 1;
}
}

return Object.keys(tweetLikes).filter(k => {
return tweetLikes[k] >= minLikeThreshold;
});
}

var a = [['A', 'B'], ['A', 'C'], ['B', 'C'], ['D', 'A'], ['D', 'B']];
var b = [['A', 'T1'], ['B', 'T2'], ['A', 'T2']];
console.log(getRecommendedTweets(a, b, 'D', 1));

// process.stdin.resume();
// process.stdin.setEncoding('ascii');

// var input_stdin = "";
// var input_stdin_array = "";
// var input_currentline = 0;

// process.stdin.on('data', function (data) {
// input_stdin += data;
// });

// process.stdin.on('end', function () {
// input_stdin_array = input_stdin.split("n");
// main();
// });

// function readLine() {
// return input_stdin_array[input_currentline++];
// }

// /////////////// ignore above this line ////////////////////

// function main() {
// var n_temp = readLine().split(' ');
// var n = parseInt(n_temp[0]);
// var k = parseInt(n_temp[1]);
// x = readLine().split(' ');
// x = x.map(Number);

// }