// 0008.go contains some functions to solve ProjectEuler.net's Problem #8
// https://projecteuler.net/problem=8
package main
import (
"fmt"
"strings"
"strconv"
)
// StringToIntArray converts a number string to an int array, assuming all
// elements in the string array were numbers to begin with.
func StringToIntArray(numberString string) []int {
// Create int array
intArray := make([]int, len(numberString))
// Strip whitespace in numberString and convert to string array
stringArray := strings.Split(strings.Join(strings.Fields(numberString), ""), "")
for i, s := range stringArray {
// Convert string to int and add to int array
intArray[i], _ = strconv.Atoi(s)
}
// Return result
return intArray
}
// AdjacentProduct returns the highest product in an array given the number
// of consecutive digits and the int array.
func AdjacentProduct(digits int, intArray []int) int {
// Initialise variables
maxProduct := 0
length := len(intArray)-digits
var currentProduct int
OUTER:
for i := 0; i<length; i++ {
currentProduct = 1
for j := 0; j < digits; j++ {
if intArray[i+j] == 0 {
// Anything * 0 is equal to 0, and irrelevant
i += digits-1
continue OUTER
}
// Calculate product
currentProduct *= intArray[i+j]
}
if currentProduct > maxProduct {
// Get highest possible product
maxProduct = currentProduct
}
}
return maxProduct
}
func main(){
// Answer the problem
number := `73167176531330624919225119674426574742355349194934
96983520312774506326239578318016984801869478851843
85861560789112949495459501737958331952853208805511
12540698747158523863050715693290963295227443043557
66896648950445244523161731856403098711121722383113
62229893423380308135336276614282806444486645238749
30358907296290491560440772390713810515859307960866
70172427121883998797908792274921901699720888093776
65727333001053367881220235421809751254540594752243
52584907711670556013604839586446706324415722155397
53697817977846174064955149290862569321978468622482
83972241375657056057490261407972968652414535100474
82166370484403199890008895243450658541227588666881
16427171479924442928230863465674813919123162824586
17866458359124566529476545682848912883142607690042
24219022671055626321111109370544217506941658960408
07198403850962455444362981230987879927244284909188
84580156166097919133875499200524063689912560717606
05886116467109405077541002256983155200055935729725
71636269561882670428252483600823257530420752963450`
numberArray := StringToIntArray(number)
fmt.Println(AdjacentProduct(13, numberArray))
}
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