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viral-advertising.js
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viral-advertising.js
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'use strict';
const fs = require('fs');
process.stdin.resume();
process.stdin.setEncoding('utf-8');
let inputString = '';
let currentLine = 0;
process.stdin.on('data', inputStdin => {
inputString += inputStdin;
});
process.stdin.on('end', _ => {
inputString = inputString.replace(/\s*$/, '')
.split('\n')
.map(str => str.replace(/\s*$/, ''));
main();
});
function readLine() {
return inputString[currentLine++];
}
// Complete the viralAdvertising function below.
function viralAdvertising(n) {
let likes = 0;
let shares = 5;
for (let i = 0; i < n; i++) {
likes += Math.floor(shares / 2);
shares = Math.floor(shares / 2) * 3
}
return likes;
}
function main() {
const ws = fs.createWriteStream(process.env.OUTPUT_PATH);
const n = parseInt(readLine(), 10);
let result = viralAdvertising(n);
ws.write(result + "\n");
ws.end();
}