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main + +import ( + "bufio" + "fmt" + "os" + "strconv" +) + +const entryBits = 12 +//const entryBits = 5 + +func nthBit(f int, i int) int { + a := entryBits - i - 1 + return f & (1 << a) >> a +} + +type NumberList []int + +func (n NumberList) CountBits(index int) (ones int, zeroes int) { + for _, num := range n { + if nthBit(num, index) == 1 { + ones++ + } else { + zeroes++ + } + } + return +} + +func (n NumberList) Filter(index int, bit int) NumberList { + var res NumberList + for _, num := range n { + if nthBit(num, index) == bit { + res = append(res, num) + } + } + return res +} + +func main() { + var numbers NumberList + + s := bufio.NewScanner(os.Stdin) + for s.Scan() { + value, _ := strconv.ParseInt(s.Text(), 2, 64) + numbers = append(numbers, int(value)) + } + + oxygenNumbers := numbers + for i := 0; i < entryBits; i++ { + ones, zeroes := oxygenNumbers.CountBits(i) + + var bit int + if ones >= zeroes { + bit = 1 + } else { + bit = 0 + } + + //fmt.Println(i, bit, zeroes, ones, len(oxygenNumbers)) + oxygenNumbers = oxygenNumbers.Filter(i, bit) + if len(oxygenNumbers) == 1 { + break + } + } + oxygen := oxygenNumbers[0] + + co2Numbers := numbers + for i := 0; i < entryBits; i++ { + ones, zeroes := co2Numbers.CountBits(i) + + var bit int + if ones < zeroes { + bit = 1 + } else { + bit = 0 + } + + //fmt.Println(i, bit, zeroes, ones, len(co2Numbers)) + co2Numbers = co2Numbers.Filter(i, bit) + if len(co2Numbers) == 1 { + break + } + } + co2 := co2Numbers[0] + + fmt.Println(oxygen * co2) +} diff --git a/3/testinput b/3/testinput new file mode 100644 index 0000000..a6366a8 --- /dev/null +++ b/3/testinput @@ -0,0 +1,12 @@ +00100 +11110 +10110 +10111 +10101 +01111 +00111 +11100 +10000 +11001 +00010 +01010