Create Tim Sort.go

add hactoberfest-accepted label

Author: dev-priyanshu15

sort/Tim Sort.go

@@ -0,0 +1,78 @@
+package main
+
+import "fmt"
+
+const run = 32
+
+func insertionSort(arr []int, left, right int) {
+    for i := left + 1; i <= right; i++ {
+        temp := arr[i]
+        j := i - 1
+        for j >= left && arr[j] > temp {
+            arr[j+1] = arr[j]
+            j--
+        }
+        arr[j+1] = temp
+    }
+}
+
+func mergeTim(arr []int, l, m, r int) {
+    left := append([]int(nil), arr[l:m+1]...)
+    right := append([]int(nil), arr[m+1:r+1]...)
+
+    i, j, k := 0, 0, l
+    for i < len(left) && j < len(right) {
+        if left[i] <= right[j] {
+            arr[k] = left[i]
+            i++
+        } else {
+            arr[k] = right[j]
+            j++
+        }
+        k++
+    }
+
+    for i < len(left) {
+        arr[k] = left[i]
+        i++
+        k++
+    }
+
+    for j < len(right) {
+        arr[k] = right[j]
+        j++
+        k++
+    }
+}
+
+func timSort(arr []int, n int) {
+    for i := 0; i < n; i += run {
+        insertionSort(arr, i, min((i+run-1), (n-1)))
+    }
+
+    size := run
+    for size < n {
+        for left := 0; left < n; left += 2 * size {
+            mid := min(left+size-1, n-1)
+            right := min((left + 2*size - 1), (n-1))
+
+            if mid < right {
+                mergeTim(arr, left, mid, right)
+            }
+        }
+        size *= 2
+    }
+}
+
+func min(x, y int) int {
+    if x < y {
+        return x
+    }
+    return y
+}
+
+func main() {
+    arr := []int{34, 2, 78, 12, 45, 21, 67, 1}
+    timSort(arr, len(arr))
+    fmt.Println("Tim Sorted array:", arr)
+}