Solution to Rectangle-Builder-Greater-Area by codility

20 Nov

Question: Question Name: Rectangle-Builder-Greater-Area or RectangleBuilderGreaterArea This key is the binary search.

Solution to Dwarfs-Rafting by codility

19 Nov

Question: Question Name: Dwarfs-Rafting or DwarfsRafting Need some simple mathematical knowledge. The code is unnecessarily long. A 2-d array is better to write much shorter code. However, I keep the long version for better readability.

Solution to Slalom-Skiing by codility

22 Oct

Question: Question Name: Slalom-Skiing or SlalomSkiing This is a wonderful variant of longest increasing subsequence. Because the longest increasing subsequence is a very classic question withe O(NlogN) solution, the key point to solve this question is to covert its original form … Read More »

Solution to Flood-Depth by codility

25 Sep

Question: Question Name: Flood-Depth or FloodDepth This is a variant of Trapping Rain Water by LeetCode. The undergoing concept is the same. However, the implementation is a bit different.

Solution to Longest-Password by codility

22 Sep

Question: Question Name: Longest-Password or LongestPassword The solution could be more Pythonic with some additional space.

Solution to Contains Duplicate by LeetCode

20 Aug

Question: Question Name: Contains Duplicate In general, I found two solutions. The first solution is using hash set:

The second solution is using sorting. We could sort the input and check each pair of adjacent items. Or we could early … Read More »

Solution to Combination Sum III by LeetCode

15 Aug

Question: Question Name: Combination Sum III This is a typical recursion problem. Find out the base case and recursive cases, and that’s the right solution.

Solution to Kth Largest Element in an Array by LeetCode

10 Jun

Question: Question Name: Kth Largest Element in an Array This is exactly the quick-select.