Problem #42

Problem link
Solution:

package main

import (
    "io/ioutil"
    "strings"
)

var triangles []int

func main() {
    //read names
    fileBuf, err := ioutil.ReadFile("042_input.txt")
    if err != nil {
        panic(err.String())
    }
    fileStr := string(fileBuf)
    arr := strings.Split(fileStr, ",", -1)
    for i := range arr {
        arr[i] = strings.Split(arr[i], "\"", -1)[1]
    }

    //create an array of triangle numbers
    triangles = make([]int, 20)
    for i := range triangles {
        triangles[i] = (i * (i + 1)) / 2
    }

    //iterate over names to check
    result := 0
    for i := range arr {
        if isTriangle(alphabeticValue(arr[i])) {
            result++
        }
    }
    println(result)
}

func isTriangle(in int) bool {
    for i := range triangles {
        if triangles[i] == in {
            return true
        }
    }
    return false
}

func alphabeticValue(in string) int {
    sum := 0
    for i := range in {
        sum += int(in[i]) - int('A') + 1
    }
    return sum
}

Result: 162
Time: 0m0.009s