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package main
import (
"fmt"
"os"
"strconv"
"strings"
)
func FileRead(path string) string {
file, err := os.ReadFile(path)
if err != nil {
fmt.Println("Couldn't Read file: ", err)
}
return string(file)
}
type Op = string
const (
Plus Op = "+"
Mul Op = "*"
)
var Ops = [2]Op{Plus, Mul}
type Calibration struct {
target int
vals []int
}
type Expression = []string
// 81 + 57 * 52
func (c Calibration) String() string {
valsStr := strings.Trim(strings.Join(strings.Fields(fmt.Sprint(c.vals)), ", "), "[]")
return fmt.Sprintf("Calibration(target: %d, vals: [%s])", c.target, valsStr)
}
func parseInput(data string) []Calibration {
lines := strings.Split(data, "\n")
var cals []Calibration
for _, line := range lines {
if len(line) > 0 {
cal := strings.Split(line, ": ")
target, _ := strconv.Atoi(cal[0])
var vals []int
for _, num := range strings.Split(cal[1], " ") {
val, _ := strconv.Atoi(num)
vals = append(vals, val)
}
calibration := Calibration{
target: target,
vals: vals,
}
cals = append(cals, calibration)
}
}
return cals
}
func generatePossibleExpressions(opsLeft int, expr *Expression, expressions *[]Expression) {
if opsLeft == 0 {
comb := make([]string, len(*expr))
copy(comb, *expr)
*expressions = append(*expressions, comb)
} else {
for _, op := range Ops {
// choose
*expr = append(*expr, op)
// explore
generatePossibleExpressions(opsLeft-1, expr, expressions)
// unchoose
*expr = (*expr)[:len(*expr)-1]
}
}
}
func eval(vals []int, expressions *[]Expression) int {
for i := len(*expressions) - 1; i >= 0; i-- {
for j, op := range (*expressions)[i] {
left := vals[j-1]
right := vals[j]
evaluation := 0
if op == Plus {
evaluation := left + right
} else if op == Mul {
evaluation := left * right
}
}
}
return 5
}
func solve_part_one(data string) int {
calibrations := parseInput(data)
ans := 0
for _, calibration := range calibrations {
var expressions []Expression
generatePossibleExpressions((len(calibration.vals) - 1), &[]string{}, &expressions)
if eval(calibration.vals, &expressions) == calibration.target {
ans += calibration.target
}
fmt.Printf("expressions: %v\n", expressions)
expressions = []Expression{}
}
return ans
}
func solve_part_two(data string) int {
return 5
}
func main() {
test := FileRead("../input/day7.test")
// prod := FileRead("../input/day7.prod")
fmt.Println("Part_1 test: ", solve_part_one(test))
// fmt.Println("Part_1 prod: ", solve_part_one(prod))
// fmt.Println("Part_2 test: ", solve_part_two(test))
// fmt.Println("Part_2 prod: ", solve_part_two(prod))
}
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