Day 2 Advent of Code (part 1)

cubegames.go

package main

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

func gamePossible (line string, constraints map[string]int) bool {
  rounds := strings.Split(line, ";")
  label, count := "", 0
  for _, round := range rounds {
    games := strings.Split(round, ",")
    for _, game := range games {
      fmt.Sscanf(game, "%d %s", &count, &label)
      if count > constraints[label] {
	return false
      }
    }
  }
  return true
}

func main() {
  s, n := bufio.NewScanner(os.Stdin), 0
  constraints := map[string]int {
    "red"   : 12,
    "green" : 13,
    "blue"  : 14,
  }
  for i := 1; s.Scan(); i++ {
    v := strings.Split(s.Text(), ":")
    if gamePossible(v[1], constraints) {
      n += i
    }
  }
  fmt.Printf("%d\n", n)
}