tasks a-s

Task/Pascals-triangle/Go/pascals-triangle.go

@@ -0,0 +1,42 @@
+package main
+
+import "fmt"
+
+func printTriangle(n int) {
+    // degenerate cases
+    if n <= 0 {
+        return
+    }
+    fmt.Println(1)
+    if n == 1 {
+        return
+    }
+    // iterate over rows, zero based
+    a := make([]int, (n+1)/2)
+    a[0] = 1
+    for row, middle := 1, 0; row < n; row++ {
+        // generate new row
+        even := row&1 == 0
+        if even {
+            a[middle+1] = a[middle] * 2
+        }
+        for i := middle; i > 0; i-- {
+            a[i] += a[i-1]
+        }
+        // print row
+        for i := 0; i <= middle; i++ {
+            fmt.Print(a[i], " ")
+        }
+        if even {
+            middle++
+        }
+        for i := middle; i >= 0; i-- {
+            fmt.Print(a[i], " ")
+        }
+        fmt.Println("")
+    }
+}
+
+func main() {
+    printTriangle(4)
+}