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-rw-r--r--2021/04/first.go123
-rw-r--r--2021/04/input601
-rw-r--r--2021/04/second.go119
3 files changed, 843 insertions, 0 deletions
diff --git a/2021/04/first.go b/2021/04/first.go
new file mode 100644
index 0000000..ed3942b
--- /dev/null
+++ b/2021/04/first.go
@@ -0,0 +1,123 @@
+package main
+
+import (
+ "bufio"
+ "fmt"
+ "log"
+ "os"
+ "strconv"
+ "strings"
+)
+
+type grille struct {
+ lines [][]int
+ columns [][]int
+}
+
+var (
+ best = 100000000
+ score = 0
+)
+
+// winning func
+func win(g *grille, n int, iter int) {
+ sum := 0
+ for i := 0; i < 5; i++ {
+ for j := 0; j < len(g.lines[i]); j++ {
+ sum += g.lines[i][j]
+ }
+ }
+ if iter < best {
+ best = iter
+ score = sum * n
+ //fmt.Println(iter, n, score, g)
+ }
+}
+
+func main() {
+ f, err := os.Open("input")
+ if err != nil {
+ log.Fatalf("%+v", err)
+ }
+ defer f.Close()
+
+ scanner := bufio.NewScanner(f)
+ scanner.Split(bufio.ScanLines)
+
+ scanner.Scan()
+ tirage := make([]int, 0)
+ tirageStr := strings.Split(scanner.Text(), ",")
+ // lets process the tirage
+ for _, v := range tirageStr {
+ n, err := strconv.Atoi(v)
+ if err != nil {
+ log.Fatalf("%+v", err)
+ }
+ tirage = append(tirage, n)
+ }
+
+ for scanner.Scan() {
+ // we just scanned the new line
+ // lets init the grille
+ g := new(grille)
+ g.lines = make([][]int, 5)
+ g.columns = make([][]int, 5)
+ for i := 0; i < 5; i++ {
+ g.lines[i] = make([]int, 5)
+ g.columns[i] = make([]int, 5)
+ }
+ // lets populate the grille
+ for i := 0; i < 5; i++ {
+ scanner.Scan()
+ numbers := strings.Fields(scanner.Text())
+ for j := 0; j < 5; j++ {
+ n, err := strconv.Atoi(numbers[j])
+ if err != nil {
+ log.Fatalf("%+v", err)
+ }
+ g.lines[i][j] = n
+ g.columns[j][i] = n
+ }
+ }
+ // lets process the tirage
+ out:
+ for iter, n := range tirage {
+ if iter >= best {
+ //fmt.Println(iter, n, g)
+ break out
+ }
+ // remove the number
+ for i := 0; i < 5; i++ {
+ for j := 0; j < len(g.lines[i]); j++ {
+ if g.lines[i][j] == n {
+ if len(g.lines[i]) == 1 {
+ g.lines[i] = []int{}
+ win(g, n, iter)
+ break out
+ }
+ if j < len(g.lines[i])-1 {
+ g.lines[i][j] = g.lines[i][len(g.lines[i])-1]
+ }
+ g.lines[i] = g.lines[i][:len(g.lines[i])-1]
+ }
+ }
+ }
+ for i := 0; i < 5; i++ {
+ for j := 0; j < len(g.columns[i]); j++ {
+ if g.columns[i][j] == n {
+ if len(g.columns[i]) == 1 {
+ g.columns[i] = []int{}
+ win(g, n, iter)
+ break out
+ }
+ if j < len(g.columns[i])-1 {
+ g.columns[i][j] = g.columns[i][len(g.columns[i])-1]
+ }
+ g.columns[i] = g.columns[i][:len(g.columns[i])-1]
+ }
+ }
+ }
+ }
+ }
+ fmt.Println(score)
+}
diff --git a/2021/04/input b/2021/04/input
new file mode 100644
index 0000000..a560663
--- /dev/null
+++ b/2021/04/input
@@ -0,0 +1,601 @@
+14,30,18,8,3,10,77,4,48,67,28,38,63,43,62,12,68,88,54,32,17,21,83,64,97,53,24,2,60,96,86,23,20,93,65,34,45,46,42,49,71,9,61,16,31,1,29,40,59,87,95,41,39,27,6,25,19,58,80,81,50,79,73,15,70,37,92,94,7,55,85,98,5,84,99,26,66,57,82,75,22,89,74,36,11,76,56,33,13,72,35,78,47,91,51,44,69,0,90,52
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diff --git a/2021/04/second.go b/2021/04/second.go
new file mode 100644
index 0000000..7677e4a
--- /dev/null
+++ b/2021/04/second.go
@@ -0,0 +1,119 @@
+package main
+
+import (
+ "bufio"
+ "fmt"
+ "log"
+ "os"
+ "strconv"
+ "strings"
+)
+
+type grille struct {
+ lines [][]int
+ columns [][]int
+}
+
+var (
+ best = -1
+ score = 0
+)
+
+// winning func
+func win(g *grille, n int, iter int) {
+ sum := 0
+ for i := 0; i < 5; i++ {
+ for j := 0; j < len(g.lines[i]); j++ {
+ sum += g.lines[i][j]
+ }
+ }
+ if iter > best {
+ best = iter
+ score = sum * n
+ //fmt.Println(iter, n, score, g)
+ }
+}
+
+func main() {
+ f, err := os.Open("input")
+ if err != nil {
+ log.Fatalf("%+v", err)
+ }
+ defer f.Close()
+
+ scanner := bufio.NewScanner(f)
+ scanner.Split(bufio.ScanLines)
+
+ scanner.Scan()
+ tirage := make([]int, 0)
+ tirageStr := strings.Split(scanner.Text(), ",")
+ // lets process the tirage
+ for _, v := range tirageStr {
+ n, err := strconv.Atoi(v)
+ if err != nil {
+ log.Fatalf("%+v", err)
+ }
+ tirage = append(tirage, n)
+ }
+
+ for scanner.Scan() {
+ // we just scanned the new line
+ // lets init the grille
+ g := new(grille)
+ g.lines = make([][]int, 5)
+ g.columns = make([][]int, 5)
+ for i := 0; i < 5; i++ {
+ g.lines[i] = make([]int, 5)
+ g.columns[i] = make([]int, 5)
+ }
+ // lets populate the grille
+ for i := 0; i < 5; i++ {
+ scanner.Scan()
+ numbers := strings.Fields(scanner.Text())
+ for j := 0; j < 5; j++ {
+ n, err := strconv.Atoi(numbers[j])
+ if err != nil {
+ log.Fatalf("%+v", err)
+ }
+ g.lines[i][j] = n
+ g.columns[j][i] = n
+ }
+ }
+ // lets process the tirage
+ out:
+ for iter, n := range tirage {
+ // remove the number
+ for i := 0; i < 5; i++ {
+ for j := 0; j < len(g.lines[i]); j++ {
+ if g.lines[i][j] == n {
+ if len(g.lines[i]) == 1 {
+ g.lines[i] = []int{}
+ win(g, n, iter)
+ break out
+ }
+ if j < len(g.lines[i])-1 {
+ g.lines[i][j] = g.lines[i][len(g.lines[i])-1]
+ }
+ g.lines[i] = g.lines[i][:len(g.lines[i])-1]
+ }
+ }
+ }
+ for i := 0; i < 5; i++ {
+ for j := 0; j < len(g.columns[i]); j++ {
+ if g.columns[i][j] == n {
+ if len(g.columns[i]) == 1 {
+ g.columns[i] = []int{}
+ win(g, n, iter)
+ break out
+ }
+ if j < len(g.columns[i])-1 {
+ g.columns[i][j] = g.columns[i][len(g.columns[i])-1]
+ }
+ g.columns[i] = g.columns[i][:len(g.columns[i])-1]
+ }
+ }
+ }
+ }
+ }
+ fmt.Println(score)
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 15:01:08 +0000