Update README.md

Author: kamyu104

README.md

@@ -75,6 +75,7 @@ I'll keep updating for full summary and better solutions. Stay tuned for updates
 645 | [Set Mismatch](https://leetcode.com/problems/set-mismatch/) | [C++](./C++/set-mismatch.cpp) [Python](./Python/set-mismatch.py) | _O(n)_ | _O(1)_ | Easy ||
 693 | [Binary Number with Alternating Bits](https://leetcode.com/problems/binary-number-with-alternating-bits/) | [C++](./C++/binary-number-with-alternating-bits.cpp) [Python](./Python/binary-number-with-alternating-bits.py) | _O(1)_ | _O(1)_ | Easy ||
 762 | [Prime Number of Set Bits in Binary Representation](https://leetcode.com/problems/prime-number-of-set-bits-in-binary-representation/) | [C++](./C++/prime-number-of-set-bits-in-binary-representation.cpp) [Python](./Python/prime-number-of-set-bits-in-binary-representation.py) | _O(1)_ | _O(1)_ | Easy ||
+868 | [Binary Gap](https://leetcode.com/problems/binary-gap/) | [C++](./C++/binary-gap.cpp) [Python](./Python/binary-gap.py) | _O(1)_ | _O(1)_ | Easy ||
 
 ## Array
 |  #  | Title           |  Solution       |  Time           | Space           | Difficulty    | Tag          | Note| 
@@ -322,6 +323,7 @@ I'll keep updating for full summary and better solutions. Stay tuned for updates
 846 | [Hand of Straights](https://leetcode.com/problems/hand-of-straights/) | [C++](./C++/hand-of-straights.cpp) [Python](./Python/hand-of-straights.py) | _O(nlogn)_ | _O(n)_ | Medium |||
 855 | [Exam Room](https://leetcode.com/problems/exam-room/) | [C++](./C++/exam-room.cpp) [Python](./Python/exam-room.py) | seat: _O(logn)_ <br> leave: _O(logn)_ | _O(n)_ | Medium || BST, Hash |
 857 | [Minimum Cost to Hire K Workers](https://leetcode.com/problems/minimum-cost-to-hire-k-workers/) | [C++](./C++/minimum-cost-to-hire-k-workers.cpp) [Python](./Python/minimum-cost-to-hire-k-workers.py) | _O(nlogn)_ | _O(n)_ | Hard || Sort |
+871 | [Minimum Number of Refueling Stops](https://leetcode.com/problems/minimum-number-of-refueling-stops/) | [C++](./C++/minimum-number-of-refueling-stops.cpp) [Python](./Python/minimum-number-of-refueling-stops.py) | _O(nlogn)_ | _O(n)_ | Hard || Sort |
 
 ## Tree
 |  #  | Title           |  Solution       |  Time           | Space           | Difficulty    | Tag          | Note| 
@@ -424,6 +426,7 @@ I'll keep updating for full summary and better solutions. Stay tuned for updates
 811 | [Subdomain Visit Count](https://leetcode.com/problems/subdomain-visit-count/) | [C++](./C++/subdomain-visit-count.cpp) [Python](./Python/subdomain-visit-count.py) | _O(n)_ | _O(n)_ | Easy ||
 822 | [Card Flipping Game](https://leetcode.com/problems/card-flipping-game/) | [C++](./C++/card-flipping-game.cpp) [Python](./Python/card-flipping-game.py) | _O(n)_ | _O(n)_ | Medium ||
 825 | [Friends Of Appropriate Ages](https://leetcode.com/problems/friends-of-appropriate-ages/) | [C++](./C++/friends-of-appropriate-ages.cpp) [Python](./Python/friends-of-appropriate-ages.py) | _O(a^2 + n)_ | _O(a)_ | Medium ||
+869 | [Reordered Power of 2](https://leetcode.com/problems/reordered-power-of-2/) | [C++](./C++/reordered-power-of-2.cpp) [Python](./Python/reordered-power-of-2.py) | _O(1)_ | _O(1)_ | Medium ||
 
 ## Math
 |  #  | Title           |  Solution       |  Time           | Space           | Difficulty    | Tag          | Note| 
@@ -859,6 +862,7 @@ I'll keep updating for full summary and better solutions. Stay tuned for updates
 798 | [Smallest Rotation with Highest Score](https://leetcode.com/problems/smallest-rotation-with-highest-score/) | [C++](./C++/smallest-rotation-with-highest-score.cpp) [Python](./Python/smallest-rotation-with-highest-score.py) | _O(n)_ | _O(1)_ | Hard | |
 843 | [Guess the Word](https://leetcode.com/problems/guess-the-word/) | [C++](./C++/guess-the-word.cpp) [Python](./Python/guess-the-word.py) | _O(n^2)_ | _O(n)_ | Hard || MinMax |
 861 | [Score After Flipping Matrix](https://leetcode.com/problems/score-after-flipping-matrix/) | [C++](./C++/score-after-flipping-matrix.cpp) [Python](./Python/score-after-flipping-matrix.py) | _O(r * c)_ | _O(1)_ | Medium ||
+870 | [Advantage Shuffle](https://leetcode.com/problems/advantage-shuffle/) | [C++](./C++/advantage-shuffle.cpp) [Python](./Python/advantage-shuffle.py) | _O(nlogn)_ | _O(n)_ | Medium ||
 
 ## Graph
 |  #  | Title           |  Solution       |  Time           | Space           | Difficulty    | Tag          | Note|