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repeated-string.js
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64 lines (47 loc) · 1.71 KB
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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 repeatedString function below.
function repeatedString(string, numberOfCharactersToConsider) {
if (string.length > numberOfCharactersToConsider) {
return countOccurences(string.substring(0, numberOfCharactersToConsider));
} else {
const occurencesInString = countOccurences(string);
const numTimesToRepeatString = timesToRepeatString(string.length, numberOfCharactersToConsider)
const remainderLength = remainder(string.length, numberOfCharactersToConsider)
const occurencesInRemainder = countOccurences(string.substring(0, remainderLength))
return (occurencesInString * numTimesToRepeatString) + occurencesInRemainder;
}
}
function countOccurences(string) {
return (string.match(/a/g) || []).length;
}
function timesToRepeatString(stringLength, numberOfCharactersToConsider) {
return Math.floor(numberOfCharactersToConsider / stringLength)
}
function remainder(substringLength, numberOfCharactersToConsider) {
return numberOfCharactersToConsider % substringLength
}
function main() {
const ws = fs.createWriteStream(process.env.OUTPUT_PATH);
const s = readLine();
const n = parseInt(readLine(), 10);
let result = repeatedString(s, n);
ws.write(result + "\n");
ws.end();
}