AdventOfCode2k16/d03/d03.go

package main

import "strings"
import "bufio"
import "strconv"
import "fmt"
import "os"

func isPossibleTriangle(sides [3]int) bool {
    sum := 0
    for _, i := range(sides) {
        sum += i
    }

    for _, i := range(sides) {
        if (sum -i <= i) {
            return false
        }
    }
    return true
}

func lineToIntArr(line string) [3]int {
    words := strings.Fields(line)
    if len(words) == 3 {
        var wints [3]int
        i := 0

        for _, wstr := range(words) {
            wints[i], _ = strconv.Atoi(wstr)
            i++
        }
        return wints
    }
    return [3]int { 0, 0, 0 }
}

func isPossible(line string) bool {
    wints := lineToIntArr(line)
    return isPossibleTriangle(wints)
}

func byLine() int {
    reader := bufio.NewReader(os.Stdin)
    result := 0

    for true {
        read, _, err := reader.ReadLine()

        if isPossible(string(read)) {
            result++
        }
        if (err != nil) {
            break
        }
    }

    return result
}

func byCol() int {
    result := 0
    reader := bufio.NewReader(os.Stdin)
    i := 0
    var triangles [3][3]int

    for true {
        read, _, err := reader.ReadLine()

        currentLine := lineToIntArr(string(read))
        triangles[0][i] = currentLine[0]
        triangles[1][i] = currentLine[1]
        triangles[2][i] = currentLine[2]

        if (i == 2) {
            for _, triangle := range(triangles) {
                if isPossibleTriangle(triangle) {
                    result++
                }
            }
            i = 0
        } else {
            i++
        }
        if (err != nil) {
            break
        }
    }

    return result
}

func main() {
    result := byCol()

    fmt.Println("result is ", result)
}