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+AMSXXXMXAMAMXMSAMXMSMSSSSMSAXSMMXXMASXAMMMMMMMASAMXXXMMMAMSAMMSMMSSSMSMXSSXMSXSMXSAXSXMMSMAAMXSAMXXSXMSMMMAMMMSXMSSSMSXSAMXAXXSXMSMMXMASAMXM diff --git a/day4/x-mas.go b/day4/x-mas.go new file mode 100644 index 0000000..d99aca6 --- /dev/null +++ b/day4/x-mas.go @@ -0,0 +1,135 @@ +package main + +import ( + "fmt" + "os" + "regexp" + "strings" +) + +func check(e error) { + if e != nil { panic(e) } +} + +func rune_matrix(text string) [][]rune { + lines := strings.Split(text, "\n") + + matrix := make([][]rune, len(lines)) + for i := range matrix { + matrix[i] = make([]rune, 0, len(lines[0])) + } + + for i, line := range lines { + for _, c := range []rune(line) { + matrix[i] = append(matrix[i], c) + } + } + + return matrix +} + +func rune_matrix_to_string(matrix [][]rune) string { + lines := make([]string, 0, len(matrix)) + + for _, line := range matrix { + lines = append(lines, string(line)) + } + + return strings.Join(lines, "\n") +} + +func transpose(text string) string { + matrix := rune_matrix(text) + + matrix_T := make([][]rune, len(matrix[0])) + for i := range matrix[0] { + matrix_T[i] = make([]rune, len(matrix)) + } + + for i := range matrix { + for j := range matrix[0] { + matrix_T[j][i] = matrix[i][j] + } + } + + return rune_matrix_to_string(matrix_T) +} + +func abs(n int) int { + if n < 0 { return -n } + return n +} + +func shear(text string, offset int) string { + lines := strings.Split(text, "\n") + max_len := 0 + + // add left padding + for pad_left := range lines { + lines[pad_left] = strings.Repeat(" ", abs(pad_left - offset)) + lines[pad_left] + max_len = max(max_len, len(lines[pad_left])) + } + + // make square again by adding right padding + var pad_right int + for i := range lines { + pad_right = max_len - len(lines[i]) + lines[i] = lines[i] + strings.Repeat(" ", pad_right) + } + + return strings.Join(lines, "\n") +} + + +func main() { + + dat, err := os.ReadFile("data.txt") + check(err) + dat_str := string(dat[:len(dat) - 1]) + + // split so that overlapping ones are also matched + r1 := regexp.MustCompile("MAS") + r2 := regexp.MustCompile("SAM") + + r_nl := regexp.MustCompile("\n") + offset := r_nl.FindStringIndex(dat_str)[0] - 1 + + r_dot := regexp.MustCompile("\\.") + + // increasing left padding + transpose (shear) + a_replaced_i1 := r1.ReplaceAllString(transpose(shear(dat_str, 0)), "M.S") + a_replaced_i2 := r2.ReplaceAllString(transpose(shear(dat_str, 0)), "S.M") + a_replaced_i1 = shear(transpose(a_replaced_i1), offset) + a_replaced_i2 = shear(transpose(a_replaced_i2), offset) + //fmt.Println(a_replaced_i1, "\n") + //fmt.Println(r_dot.FindAllStringIndex(a_replaced_i1, -1), "\n") + //fmt.Println(a_replaced_i2, "\n") + //fmt.Println(r_dot.FindAllStringIndex(a_replaced_i2, -1), "\n") + dot_indices_i := r_dot.FindAllStringIndex(a_replaced_i1, -1) + dot_indices_i = append(dot_indices_i, r_dot.FindAllStringIndex(a_replaced_i2, -1)...) + //fmt.Println(dot_indices_i) + + // decreasing left padding + transpose (shear) + a_replaced_d1 := r1.ReplaceAllString(transpose(shear(dat_str, offset)), "M.S") + a_replaced_d2 := r2.ReplaceAllString(transpose(shear(dat_str, offset)), "S.M") + a_replaced_d1 = shear(transpose(a_replaced_d1), 0) + a_replaced_d2 = shear(transpose(a_replaced_d2), 0) + //fmt.Println(a_replaced_d1, "\n") + //fmt.Println(a_replaced_d2, "\n") + dot_indices_d := r_dot.FindAllStringIndex(a_replaced_d1, -1) + dot_indices_d = append(dot_indices_d, r_dot.FindAllStringIndex(a_replaced_d2, -1)...) + //fmt.Println(dot_indices_d) + + // count duplicates + matches := 0 + for _, elem1 := range dot_indices_i { + for _, elem2 := range dot_indices_d { + if elem1[0] == elem2[0] { + matches++ + break + } + } + } + + fmt.Println(matches) +} diff --git a/day4/xmas.go b/day4/xmas.go new file mode 100644 index 0000000..d1664b2 --- /dev/null +++ b/day4/xmas.go @@ -0,0 +1,115 @@ +package main + +import ( + "fmt" + "os" + "regexp" + "strings" +) + +func check(e error) { + if e != nil { panic(e) } +} + +func rune_matrix(text string) [][]rune { + lines := strings.Split(text, "\n") + + matrix := make([][]rune, len(lines)) + for i := range matrix { + matrix[i] = make([]rune, 0, len(lines[0])) + } + + for i, line := range lines { + for _, c := range []rune(line) { + matrix[i] = append(matrix[i], c) + } + } + + return matrix +} + +func rune_matrix_to_string(matrix [][]rune) string { + lines := make([]string, 0, len(matrix)) + + for _, line := range matrix { + lines = append(lines, string(line)) + } + + return strings.Join(lines, "\n") +} + +func transpose(text string) string { + matrix := rune_matrix(text) + + matrix_T := make([][]rune, len(matrix[0])) + for i := range matrix[0] { + matrix_T[i] = make([]rune, len(matrix)) + } + + for i := range matrix { + for j := range matrix[0] { + matrix_T[j][i] = matrix[i][j] + } + } + + return rune_matrix_to_string(matrix_T) +} + +func abs(n int) int { + if n < 0 { return -n } + return n +} + +func shear(text string, offset int) string { + lines := strings.Split(text, "\n") + max_len := 0 + + // add left padding + for pad_left := range lines { + lines[pad_left] = strings.Repeat(" ", abs(pad_left - offset)) + lines[pad_left] + max_len = max(max_len, len(lines[pad_left])) + } + + // make square again by adding right padding + var pad_right int + for i := range lines { + pad_right = max_len - len(lines[i]) + lines[i] = lines[i] + strings.Repeat(" ", pad_right) + } + + return strings.Join(lines, "\n") +} + + +func main() { + + dat, err := os.ReadFile("data.txt") + check(err) + dat_str := string(dat[:len(dat) - 1]) + + matches := 0 + // split so that overlapping ones are also matched + r1 := regexp.MustCompile("XMAS") + r2 := regexp.MustCompile("SAMX") + + // horizontal + matches += len(r1.FindAllStringIndex(dat_str, -1)) + matches += len(r2.FindAllStringIndex(dat_str, -1)) + + // vertical + matches += len(r1.FindAllStringIndex(transpose(dat_str), -1)) + matches += len(r2.FindAllStringIndex(transpose(dat_str), -1)) + + // increasing left padding + transpose (shear) + matches += len(r1.FindAllStringIndex(transpose(shear(dat_str, 0)), -1)) + matches += len(r2.FindAllStringIndex(transpose(shear(dat_str, 0)), -1)) + + // decreasing left padding + transpose (shear) + r := regexp.MustCompile("\n") + offset := r.FindStringIndex(dat_str)[0] - 1 + + matches += len(r1.FindAllStringIndex(transpose(shear(dat_str, offset)), -1)) + matches += len(r2.FindAllStringIndex(transpose(shear(dat_str, offset)), -1)) + + fmt.Println(matches) +}