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package main
import (
"fmt"
"os"
"strconv"
)
func InsertAt(arr *[]FileBlock, index int, value FileBlock) error {
if index < 0 || index > len(*arr) {
return fmt.Errorf("index out of range")
}
*arr = append((*arr)[:index], append([]FileBlock{value}, (*arr)[index:]...)...)
return nil
}
func RemoveAt(arr *[]FileBlock, index int) (FileBlock, error) {
if index < 0 || index >= len(*arr) {
return FileBlock{}, fmt.Errorf("index out of range")
}
ele := (*arr)[index]
*arr = append((*arr)[:index], (*arr)[index+1:]...)
return ele, nil
}
func FileRead(path string) string {
file, err := os.ReadFile(path)
if err != nil {
fmt.Println("Couldn't Read file: ", err)
}
return string(file)
}
func parseInput(data string) string {
return data
}
func genereateBlockMap(diskMap string) []string {
var blockMap []string
id := 0
for i, ch := range diskMap {
rep, _ := strconv.Atoi(string(ch))
if i%2 == 0 {
for i := 0; i < rep; i++ {
blockMap = append(blockMap, strconv.Itoa(id))
}
id += 1
} else {
for i := 0; i < rep; i++ {
blockMap = append(blockMap, ".")
}
}
}
return blockMap
}
func genereateFileBlocks(diskMap string) []FileBlock {
var fileBlocks []FileBlock
id := 0
for i, ch := range diskMap {
rep, _ := strconv.Atoi(string(ch))
if i%2 == 0 {
block := FileBlock{id: id, space: rep}
fileBlocks = append(fileBlocks, block)
id += 1
} else {
block := FileBlock{id: -1, space: rep}
if rep > 0 {
fileBlocks = append(fileBlocks, block)
}
}
}
return fileBlocks
}
func moveBlocks(blockMap []string) {
i := 0
j := len(blockMap) - 1
for i < j {
if blockMap[i] == "." {
if blockMap[j] != "." {
blockMap[i], blockMap[j] = blockMap[j], blockMap[i]
i++
}
j--
} else {
i++
}
}
}
type FileBlock struct {
id int // id -1 will be the free block '.'
space int
}
// i = 1 j=12
// [{0 2} {-1 3} {-1,1} {1 3} {-1 3} {2 1} {-1 3} {3 3} {-1 1} {4 2} {-1 1} {5 4} {-1 1} {6 4} {-1 1} {7 3} {-1 1} {8 4} {9 2}]
func moveBlocksPartTwo(fileBlocks []FileBlock) []string {
for i := 0; i < len(fileBlocks); i++ {
if fileBlocks[i].id != -1 {
continue
}
for j := len(fileBlocks) - 1; j >= i; j-- {
if fileBlocks[j].id == -1 {
continue
}
if fileBlocks[i].space == fileBlocks[j].space {
fileBlocks[i], fileBlocks[j] = fileBlocks[j], fileBlocks[i]
i++
j--
break
} else if fileBlocks[i].space > fileBlocks[j].space {
_ = InsertAt(&fileBlocks, i+1, FileBlock{id: -1, space: fileBlocks[i].space - fileBlocks[j].space})
spaceJ := fileBlocks[j+1].space
fileBlocks[i], fileBlocks[j+1] = fileBlocks[j+1], fileBlocks[i]
fileBlocks[j+1].id = -1
fileBlocks[j+1].space = spaceJ
break
}
}
}
var blocks []string
for _, block := range fileBlocks {
if block.id == -1 {
for i := 0; i < block.space; i++ {
blocks = append(blocks, ".")
}
} else {
for i := 0; i < block.space; i++ {
blocks = append(blocks, strconv.Itoa(block.id))
}
}
}
return blocks
}
func checkSum(blockMap []string) int64 {
var sum int64 = 0
for i, ch := range blockMap {
if ch == "." {
continue
}
id, _ := strconv.Atoi(ch)
sum += int64(id) * int64(i)
}
return sum
}
func solve_part_one(data string) int64 {
diskMap := parseInput(data)
blockMap := genereateBlockMap(diskMap)
moveBlocks(blockMap)
return checkSum(blockMap)
}
func solve_part_two(data string) int64 {
diskMap := parseInput(data)
fileBlocks := genereateFileBlocks(diskMap)
blocks := moveBlocksPartTwo(fileBlocks)
return checkSum(blocks)
}
func main() {
test := FileRead("../input/day9.test")
prod := FileRead("../input/day9.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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