Day 9, working part 1 and 2

day09/inputs

@@ -0,0 +1 @@
+../inputs

day09/oasis.go

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+package main
+
+import(
+    "fmt"
+    "os"
+    "bufio"
+    "sync"
+    "time"
+    "regexp"
+    "strconv"
+)
+
+// Parallel code, global vars
+type Series struct {
+	mu       	sync.Mutex
+	numStore 	[][]int
+	total		uint64
+}
+
+func check(e error) {
+	if e != nil {
+		panic(e)
+	}
+}
+
+func PrintAndWait(x ...any) {
+	fmt.Print(x...)
+	fmt.Scanln()
+}
+// use defer timer("funcname")() when the function you want to
+// test starts
+func timer(name string) func() {
+	start := time.Now()
+	return func() {
+		fmt.Printf("%s took %v\n", name, time.Since(start))
+	}
+}
+
+func PredictValueBack(numbers []int) []int {
+	// Are we finished? By default, true
+    temp := true
+    for i := 0; i < len(numbers); i++ {
+        if numbers[i] != 0 {
+            temp = false
+            break
+        }
+    }
+    // Check to end recursion
+    if temp == true {
+        return numbers
+    }
+
+	newNums := make([]int, len(numbers) - 1)
+	for i := 0; i < len(numbers) - 1; i++ {
+    	newNums[i] = numbers[i + 1] - numbers[i]
+	}
+	myNums := PredictValueBack(newNums)
+	addValue := newNums[0] - myNums[0]
+	// We need to append at the start
+	newNums = append([]int{addValue}, newNums...)
+	return newNums
+}
+
+func (ser *Series) CallPredictBack(numbers []int, wg *sync.WaitGroup) {
+    tempNum := PredictValueBack(numbers)
+ 	ser.mu.Lock()
+    ser.total += uint64(numbers[0] - tempNum[0])
+    ser.mu.Unlock()
+    wg.Done()
+}
+
+func PredictValue(numbers []int) []int {
+	// Are we finished? By default, true
+    temp := true
+    for i := 0; i < len(numbers); i++ {
+        if numbers[i] != 0 {
+            temp = false
+            break
+        }
+    }
+    // Check to end recursion
+    if temp == true {
+        return numbers
+    }
+
+	newNums := make([]int, len(numbers) - 1)	
+	for i := 0; i < len(numbers) - 1; i++ {
+    	newNums[i] = numbers[i + 1] - numbers[i]
+	}
+	myNums := PredictValue(newNums)
+	addValue := myNums[len(myNums) - 1]
+	newNums = append(newNums, newNums[len(newNums) - 1] + addValue)
+	return newNums
+}
+
+func (ser *Series) CallPredict(numbers []int, wg *sync.WaitGroup) {
+    tempNum := PredictValue(numbers)
+    lt 		:= len(tempNum) - 1
+ 	ln		:= len(numbers) - 1
+ 	ser.mu.Lock()
+    ser.total += uint64(numbers[ln] + tempNum[lt])
+    ser.mu.Unlock()
+    wg.Done()
+}
+
+func main() {
+    defer timer("main")()
+	file, err := os.Open("./inputs/day09_input")
+	check(err)
+	defer file.Close()
+
+	var wg sync.WaitGroup
+
+	renum := regexp.MustCompile("(\\-[0-9]+|[0-9]+)")
+
+	ser := Series{ total: 0, }
+	
+	lines := make([]string, 0)
+	
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+	    lines = append(lines, scanner.Text())
+	}
+	ser.numStore = make([][]int, len(lines))
+	for i := 0; i < len(lines); i++ {
+    	temp := renum.FindAllString(lines[i], -1) 
+    	for j := 0; j < len(temp); j++ {
+        	num, err := strconv.Atoi(temp[j])
+			check(err)
+			ser.numStore[i] = append(ser.numStore[i], num)
+    	}
+	}
+	// Now I have a 2D array with all the numbers, I can start RECURSING
+	wg.Add(len(ser.numStore)) 
+	for i := 0; i < len(ser.numStore); i++ {
+    	go ser.CallPredict(ser.numStore[i], &wg)
+	}
+	wg.Wait()
+	fmt.Printf("%d\n", ser.total)
+
+	ser.total = 0
+	wg.Add(len(ser.numStore))
+	for i := 0; i < len(ser.numStore); i++ {
+    	go ser.CallPredictBack(ser.numStore[i], &wg)
+	}
+	wg.Wait()
+	fmt.Printf("%d\n", ser.total)
+	
+}