diff --git a/sort.c b/sort.c
index b43ee6e..88e0663 100644
--- a/sort.c
+++ b/sort.c
@@ -21,7 +21,16 @@ typedef struct {
 void
 insert_sort(int *arr, size_t sz)
 {
-	// <YOURCODE>
+	int i, j;
+	for (i = 1; i < sz; i++){
+		int key = arr[i];
+		j = i - 1;
+		while (j >= 0 && arr[j] > key){
+			arr[j + 1] = arr[j];
+			j--;
+		}
+		arr[j + 1] = key;
+	}
 }
 
 void
@@ -67,7 +76,28 @@ bubble_sort(int *arr, size_t sz)
 static void
 _merge(int *tmp, int *a, int *b, int *end)
 {
-	// <YOURCODE>
+	int *left = a; 
+	int *right = b; 
+	int *result = tmp; 
+
+
+	while (left < b && right < end) {
+		if (*left <= *right) {
+			*result++ = *left++;
+		} else {
+			*result++ = *right++;
+		}
+	}
+
+
+	while (left < b) {
+		*result++ = *left++;
+	}
+
+
+	while (right < end) {
+		*result++ = *right++;
+	}
 }
 
 static void