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problem8.js
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problem8.js
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function thirteen(strNumber) {
if (strNumber.includes('0')) {
return 0
}
let product = 1, length = strNumber.length
for (let i = 0; i < length; i++) {
product *= parseInt(strNumber[i])
}
return product
}
function problem8(number1000) {
let startIndex = 0, endIndex = 13
const length = number1000.length
let biggestProduct = 0, tempProduct, current13, biggest13
while (endIndex <= length) {
current13 = number1000.slice(startIndex, endIndex)
tempProduct = thirteen(current13)
if (tempProduct > biggestProduct) {
biggestProduct = tempProduct
biggest13 = current13
}
startIndex += 1
endIndex += 1
}
return biggestProduct
}
const large = `7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450`
const startTime = Date.now()
const number = problem8(large)
const endTime = Date.now()
console.log('number: ', number)
const runningTime = endTime - startTime
console.log(`Running time (s): ${runningTime / 1000}`)