Update 4.shellSort.md

Author: shouao

4.shellSort.md

@@ -153,14 +153,15 @@ void shellSort(vector<int>& nums) {
     while (gap < (int)nums.size() / 3) {
     	gap = gap * 3 + 1;
     }
-	for (; gap >= 1; gap /= 3) {
-		for (int i = 0; i < gap; ++i) {
-			for (int j = i + gap; j < nums.size(); j += gap) {
-				for (int k = j; k - gap >= 0 && nums[k] < nums[k - gap]; k -= gap) {
-                	swap(nums[k], nums[k - gap]);
+    for (; gap >= 1; gap /= 3) {
+	for (int i = 0; i < gap; ++i) {
+	    for (int j = i + gap; j < nums.size(); j += gap) {
+		for (int k = j; k - gap >= 0 && nums[k] < nums[k - gap]; k -= gap) {
+                    swap(nums[k], nums[k - gap]);
                 }
             }
         }
     }
 }
-```
+
+```