Update 0215.Kth-Largest-Element-in-an-Array.md

Author: leizhiyuan

website/content/ChapterFour/0200~0299/0215.Kth-Largest-Element-in-an-Array.md

@@ -73,6 +73,19 @@ func selection(arr []int, l, r, k int) int {
 	}
 }
 
+func partition164(a []int, lo, hi int) int {
+	pivot := a[hi]
+	i := lo - 1
+	for j := lo; j < hi; j++ {
+		if a[j] < pivot {
+			i++
+			a[j], a[i] = a[i], a[j]
+		}
+	}
+	a[i+1], a[hi] = a[hi], a[i+1]
+	return i + 1
+}
+
 ```