Advent of Code; Exercise 2; Part 2

cubegames2.go

package main

import (
  "fmt"
  "bufio"
  "os"
  "strings"
  "math"
)

func max (a, b int) int {
  if a >= b {
    return a
  }
  return b
}

func minPower (line string) int {
  minMap := map[string]int{}
  rounds := strings.Split(line, ";")
  color, n := "", 0
  for _, round := range rounds {
    set := strings.Split(round, ",")
    for _, draw := range set {
      fmt.Sscanf(draw, "%d %s", &n, &color)
      value, ok := minMap[color]
      if !ok {
        minMap[color] = n
      } else {
        minMap[color] = max(value, n)
      }
    }
  }
  p := 1
  for _, min := range minMap {
    p *= min
  }
  return p
}

func main() {
  s, n := bufio.NewScanner(os.Stdin), 0
  for i := 1; s.Scan(); i++ {
    v := strings.Split(s.Text(), ":")
    n += minPower(v[1])
  }
  fmt.Printf("%d\n", n)
}