diff --git a/378. Kth Smallest Element in a Sorted Matrix.cpp b/378. Kth Smallest Element in a Sorted Matrix.md
similarity index 79%
rename from 378. Kth Smallest Element in a Sorted Matrix.cpp
rename to 378. Kth Smallest Element in a Sorted Matrix.md
index 4976ce0..8782685 100644
--- a/378. Kth Smallest Element in a Sorted Matrix.cpp	
+++ b/378. Kth Smallest Element in a Sorted Matrix.md	
@@ -1,6 +1,13 @@
-//Priority queue
-//Runtime: 84 ms, faster than 14.51% of C++ online submissions for Kth Smallest Element in a Sorted Matrix.
-//Memory Usage: 12.4 MB, less than 59.09% of C++ online submissions for Kth Smallest Element in a Sorted Matrix.
+# 378. Kth Smallest Element in a Sorted Matrix
+
+[leetcode - 378. Kth Smallest Element in a Sorted Matrix](https://leetcode.com/problems/kth-smallest-element-in-a-sorted-matrix/)
+
+## Priority queue
+Runtime: 84 ms, faster than 14.51% of C++ online submissions for Kth Smallest Element in a Sorted Matrix.
+
+Memory Usage: 12.4 MB, less than 59.09% of C++ online submissions for Kth Smallest Element in a Sorted Matrix.
+
+```cpp
 class Solution {
 public:
     int kthSmallest(vector<vector<int>>& matrix, int k) {
@@ -21,11 +28,16 @@ class Solution {
         return pq.top();
     }
 };
+```
 
-//Priority queue(optimized)
-//https://leetcode.com/problems/kth-smallest-element-in-a-sorted-matrix/discuss/85173/Share-my-thoughts-and-Clean-Java-Code
-//Runtime: 68 ms, faster than 27.19% of C++ online submissions for Kth Smallest Element in a Sorted Matrix.
-//Memory Usage: 14.2 MB, less than 9.09% of C++ online submissions for Kth Smallest Element in a Sorted Matrix.
+## Priority queue(optimized)
+https://leetcode.com/problems/kth-smallest-element-in-a-sorted-matrix/discuss/85173/Share-my-thoughts-and-Clean-Java-Code
+
+Runtime: 68 ms, faster than 27.19% of C++ online submissions for Kth Smallest Element in a Sorted Matrix.
+
+Memory Usage: 14.2 MB, less than 9.09% of C++ online submissions for Kth Smallest Element in a Sorted Matrix.
+
+```cpp
 class Tuple{
 public:
     int x;
@@ -64,11 +76,18 @@ class Solution {
         return pq.top()->val;
     }
 };
+```
+
 
-//Solution 2 : Binary Search in range
-//https://leetcode.com/problems/kth-smallest-element-in-a-sorted-matrix/discuss/85173/Share-my-thoughts-and-Clean-Java-Code
-//Runtime: 36 ms, faster than 94.39% of C++ online submissions for Kth Smallest Element in a Sorted Matrix.
-//Memory Usage: 11.1 MB, less than 100.00% of C++ online submissions for Kth Smallest Element in a Sorted Matrix.
+## Solution 2 : Binary Search in range
+
+https://leetcode.com/problems/kth-smallest-element-in-a-sorted-matrix/discuss/85173/Share-my-thoughts-and-Clean-Java-Code
+
+Runtime: 36 ms, faster than 94.39% of C++ online submissions for Kth Smallest Element in a Sorted Matrix.
+
+Memory Usage: 11.1 MB, less than 100.00% of C++ online submissions for Kth Smallest Element in a Sorted Matrix.
+
+```cpp
 class Solution {
 public:
     int kthSmallest(vector<vector<int>>& matrix, int k) {
@@ -105,11 +124,16 @@ class Solution {
         return lo;
     }
 };
+```
+
+## findNSum, recursive, optimized
+https://leetcode.com/problems/4sum/discuss/8545/Python-140ms-beats-100-and-works-for-N-sum-(Ngreater2)
+
+Runtime: 8 ms, faster than 98.35% of C++ online submissions for 4Sum.
+
+Memory Usage: 8.5 MB, less than 100.00% of C++ online submissions for 4Sum.
 
-//findNSum, recursive, optimized
-//https://leetcode.com/problems/4sum/discuss/8545/Python-140ms-beats-100-and-works-for-N-sum-(Ngreater2)
-//Runtime: 8 ms, faster than 98.35% of C++ online submissions for 4Sum.
-//Memory Usage: 8.5 MB, less than 100.00% of C++ online submissions for 4Sum.
+```cpp
 class Solution {
 public:
     void findNSum(int l, int r, int target, int N, vector<int>& nums, vector<int>& result, vector<vector<int>>& results){
@@ -173,3 +197,4 @@ class Solution {
         return results;
     }
 };
+```