Update README.md

Author: kamyu104

README.md

@@ -1,8 +1,8 @@
-# [LeetCode](https://leetcode.com/problemset/algorithms/) ![Language](https://img.shields.io/badge/language-Python-orange.svg) [![License](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE.md) ![Progress](https://img.shields.io/badge/progress-326%20%2F%20326-ff69b4.svg)
+# [LeetCode](https://leetcode.com/problemset/algorithms/) ![Language](https://img.shields.io/badge/language-Python-orange.svg) [![License](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE.md) ![Progress](https://img.shields.io/badge/progress-327%20%2F%20327-ff69b4.svg)
 
-Up to date (2016-01-08), there are `309` Algorithms / `13` Database / `4` Shell questions on [LeetCode Online Judge](https://leetcode.com/).
+Up to date (2016-01-08), there are `310` Algorithms / `13` Database / `4` Shell questions on [LeetCode Online Judge](https://leetcode.com/).
 The number of questions is increasing recently.
-Here is the classification of all `326` questions.
+Here is the classification of all `327` questions.
 For more questions and solutions, you can see my [LintCode](https://github.com/kamyu104/LintCode) repository.
 I'll keep updating for full summary and better solutions. Stay tuned for updates.
 (Notes: "📖" means you need to subscribe to [LeetCode premium membership](https://leetcode.com/subscribe/) for the access to premium questions. )
@@ -293,6 +293,7 @@ I'll keep updating for full summary and better solutions. Stay tuned for updates
 156| [Binary Tree Upside Down](https://leetcode.com/problems/binary-tree-upside-down/) | [Python](./Python/binary-tree-upside-down.py) | _O(n)_ | _O(1)_ | Medium    |📖| 
 241| [Different Ways to Add Parentheses](https://leetcode.com/problems/different-ways-to-add-parentheses/) | [C++](./C++/different-ways-to-add-parentheses.cpp) [Python](./Python/different-ways-to-add-parentheses.py) | _O(n * 4^n / n^(3/2))_ | _O(n * 4^n / n^(3/2))_ | Medium    || 
 298 | [Binary Tree Longest Consecutive Sequence](https://leetcode.com/problems/binary-tree-longest-consecutive-sequence/) | [C++](./C++/binary-tree-longest-consecutive-sequence.cpp) [Python](./Python/binary-tree-longest-consecutive-sequence.py) | _O(n)_ | _O(h)_ | Medium    |📖| 
+327| [Count of Range Sum](https://leetcode.com/problems/count-of-range-sum/) | [C++](./C++/count-of-range-sum.cpp) [Python](./Python/count-of-range-sum.py) | _O(nlogn)_        | _O(n)_          | Hard         ||
 
 ## Binary Search
   #  | Problem         |  Solution       |  Time           | Space           | Difficulty    | Tag          | Note