alazyreader/AdventOfCode2023
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use a coord struct instead of Sprintf

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This commit is contained in:
David 2023-12-03 20:33:05 -05:00
parent f4b07a0327
commit d529b002b4
1 changed files with 18 additions and 17 deletions
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35
03/main.go
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@ -33,7 +33,7 @@ func makeScanner(test bool) *bufio.Scanner {
return bufio.NewScanner(reader)
}
type schematic map[string]entry
type schematic map[coord]entry
type entry struct {
num []rune
@ -45,12 +45,13 @@ type tmp struct {
col int
}
func key(row, col int) string {
return fmt.Sprintf("%d.%d", row, col)
type coord struct {
row int
col int
}
func isSymbol(s schematic, row, col int) bool {
if c, ok := s[key(row, col)]; ok {
if c, ok := s[coord{row, col}]; ok {
return c.symb != 0
}
return false
@ -76,17 +77,17 @@ func partOne() {
}
default:
if len(i.tmp) != 0 {
schematic[key(row, i.col)] = entry{num: i.tmp}
schematic[coord{row, i.col}] = entry{num: i.tmp}
i.tmp = []rune{}
}
if c != '.' {
schematic[key(row, col)] = entry{symb: c}
schematic[coord{row, col}] = entry{symb: c}
}
}
}
// check if we have a number still to save but ran out of line
if len(i.tmp) != 0 {
schematic[key(row, i.col)] = entry{num: i.tmp}
schematic[coord{row, i.col}] = entry{num: i.tmp}
}
row++
}
@ -94,7 +95,7 @@ func partOne() {
// now, map back over the schematics and find the parts
for row := 0; row <= 139; row++ {
for col := 0; col <= 139; col++ {
if entry, ok := schematic[key(row, col)]; ok && entry.symb == 0 {
if entry, ok := schematic[coord{row, col}]; ok && entry.symb == 0 {
part := mustAtoi(entry.num)
if isSymbol(schematic, row, col-1) {
// look behind
@ -139,32 +140,32 @@ func partTwo() {
}
default:
if len(i.tmp) != 0 {
schematic[key(row, i.col)] = entry{num: i.tmp}
schematic[coord{row, i.col}] = entry{num: i.tmp}
i.tmp = []rune{}
}
if c == '*' { // no longer care about other symbols
schematic[key(row, col)] = entry{symb: c}
schematic[coord{row, col}] = entry{symb: c}
}
}
}
// check if we have a number still to save but ran out of line
if len(i.tmp) != 0 {
schematic[key(row, i.col)] = entry{num: i.tmp}
schematic[coord{row, i.col}] = entry{num: i.tmp}
}
row++
}
gears := map[string]int{}
gears := map[coord]int{}
sum := 0
// map back over the schematics and find the gears.
// there are only ever 1 or 2 parts attached to a gear.
for row := 0; row <= 139; row++ {
for col := 0; col <= 139; col++ {
if entry, ok := schematic[key(row, col)]; ok && entry.symb == 0 {
if entry, ok := schematic[coord{row, col}]; ok && entry.symb == 0 {
offset := len(entry.num)
part := mustAtoi(entry.num)
if isSymbol(schematic, row, col-1) {
k := key(row, col-1)
k := coord{row, col - 1}
if gears[k] != 0 {
sum += gears[k] * part
} else {
@ -172,7 +173,7 @@ func partTwo() {
}
}
if isSymbol(schematic, row, col+offset) {
k := key(row, col+offset)
k := coord{row, col + offset}
if gears[k] != 0 {
sum += gears[k] * part
} else {
@ -181,7 +182,7 @@ func partTwo() {
}
for i := -1; i < offset+1; i++ {
if isSymbol(schematic, row-1, col+i) {
k := key(row-1, col+i)
k := coord{row - 1, col + i}
if gears[k] != 0 {
sum += gears[k] * part
} else {
@ -189,7 +190,7 @@ func partTwo() {
}
}
if isSymbol(schematic, row+1, col+i) {
k := key(row+1, col+i)
k := coord{row + 1, col + i}
if gears[k] != 0 {
sum += gears[k] * part
} else {