Update README.md

Author: kamyu104

README.md

@@ -431,7 +431,7 @@
 1047 | [Remove All Adjacent Duplicates In String](https://leetcode.com/problems/remove-all-adjacent-duplicates-in-string/) | [C++](./C++/remove-all-adjacent-duplicates-in-string.cpp) [Python](./Python/remove-all-adjacent-duplicates-in-string.py) | _O(n)_ | _O(n)_      | Easy         ||
 1063| [Number of Valid Subarrays](https://leetcode.com/problems/number-of-valid-subarrays/)| [C++](./C++/number-of-valid-subarrays.cpp)  [Python](./Python/number-of-valid-subarrays.py)| _O(n)_ | _O(n)_         | Hard           | 🔒 | Mono Stack
 1130| [Minimum Cost Tree From Leaf Values](https://leetcode.com/problems/minimum-cost-tree-from-leaf-values/)| [C++](./C++/minimum-cost-tree-from-leaf-values.cpp)  [Python](./Python/minimum-cost-tree-from-leaf-values.py)| _O(n)_ | _O(n)_         | Medium           || Mono Stack
-1190| [Reverse Substrings Between Each Pair of Parentheses](https://leetcode.com/problems/reverse-substrings-between-each-pair-of-parentheses/)| [C++](./C++/reverse-substrings-between-each-pair-of-parentheses.cpp)  [Python](./Python/reverse-substrings-between-each-pair-of-parentheses.py)| _O(n^2)_ | _O(n)_         | Medium           ||
+1190| [Reverse Substrings Between Each Pair of Parentheses](https://leetcode.com/problems/reverse-substrings-between-each-pair-of-parentheses/)| [C++](./C++/reverse-substrings-between-each-pair-of-parentheses.cpp)  [Python](./Python/reverse-substrings-between-each-pair-of-parentheses.py)| _O(n)_ | _O(n)_         | Medium           ||
 1209 | [Remove All Adjacent Duplicates in String II](https://leetcode.com/problems/remove-all-adjacent-duplicates-in-string-ii/) | [C++](./C++/remove-all-adjacent-duplicates-in-string-ii.cpp) [Python](./Python/remove-all-adjacent-duplicates-in-string-ii.py) | _O(n)_ | _O(n)_      | Medium         ||
 
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