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2020 day 3 - simple 2d grid traversal

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alexchao26
2020-12-03 00:28:22 -05:00
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2020/day03/input.txt
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2020/day03/main.go
+59 -2
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@@ -3,6 +3,7 @@ package main
import (
"flag"
"fmt"
"strings"
"github.com/alexchao26/advent-of-code-go/util"
)
@@ -15,17 +16,73 @@ func main() {
if part == 1 {
ans := part1(util.ReadFile("./input.txt"))
util.CopyToClipboard(fmt.Sprintf("%v", ans))
fmt.Println("Output:", ans)
} else {
ans := part2(util.ReadFile("./input.txt"))
util.CopyToClipboard(fmt.Sprintf("%v", ans))
fmt.Println("Output:", ans)
}
}
func part1(input string) int {
return 0
grid := parseInput(input)
return rideSlopes(grid, 3, 1)
}
func part2(input string) int {
return 0
grid := parseInput(input)
slopes := [][2]int{
// right, down
{1, 1},
{3, 1},
{5, 1},
{7, 1},
{1, 2},
}
ans := 1
for _, slope := range slopes {
ans *= rideSlopes(grid, slope[0], slope[1])
}
return ans
}
func parseInput(input string) (grid [][]bool) {
lines := strings.Split(input, "\n")
grid = make([][]bool, len(lines))
for i, l := range lines {
grid[i] = make([]bool, len(l))
for j, v := range l {
if v == '#' {
grid[i][j] = true
}
}
}
return grid
}
func rideSlopes(grid [][]bool, right, down int) int {
var row, col int
var ans int
for {
row += down
col += right
col %= len(grid[0])
if row < len(grid) {
if grid[row][col] {
ans++
}
} else {
break
}
}
return ans
}
2020/day03/main_test.go
+31 -7
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@@ -1,19 +1,33 @@
package main
import "testing"
import (
"testing"
"github.com/alexchao26/advent-of-code-go/util"
)
var tests1 = []struct {
name string
want int
input string
// add extra args if needed
}{
// {"actual", ACTUAL_ANSWER, util.ReadFile("input.txt")},
{"example", 7, `..##.......
#...#...#..
.#....#..#.
..#.#...#.#
.#...##..#.
..#.##.....
.#.#.#....#
.#........#
#.##...#...
#...##....#
.#..#...#.#`},
{"actual", 209, util.ReadFile("input.txt")},
}
func TestPart1(t *testing.T) {
for _, test := range tests1 {
t.Run(test.name, func(*testing.T) {
t.Run(test.name, func(t *testing.T) {
got := part1(test.input)
if got != test.want {
t.Errorf("got %v, want %v", got, test.want)
@@ -26,14 +40,24 @@ var tests2 = []struct {
name string
want int
input string
// add extra args if needed
}{
// {"actual", ACTUAL_ANSWER, util.ReadFile("input.txt")},
{"example", 336, `..##.......
#...#...#..
.#....#..#.
..#.#...#.#
.#...##..#.
..#.##.....
.#.#.#....#
.#........#
#.##...#...
#...##....#
.#..#...#.#`},
{"actual", 1574890240, util.ReadFile("input.txt")},
}
func TestPart2(t *testing.T) {
for _, test := range tests2 {
t.Run(test.name, func(*testing.T) {
t.Run(test.name, func(t *testing.T) {
got := part2(test.input)
if got != test.want {
t.Errorf("got %v, want %v", got, test.want)