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How does a diff algorithm work, e. g. in VCDIFF and DiffMerge? An O(ND) Difference Algorithm and its Variations (1986, Eugene W Myers) is a fantastic paper and you may want to start there It includes pseudo-code and a nice visualization of the graph traversals involved in doing the diff Section 4 of the paper introduces some refinements to the algorithm that make it very effective
algorithm - Finding all possible combinations of numbers to reach a . . . Here is a Java version which is well suited for small N and very large target sum, when complexity O(t*N) (the dynamic solution) is greater than the exponential algorithm My version uses a meet in the middle attack, along with a little bit shifting in order to reduce the complexity from the classic naive O(n*2^n) to O(2^(n 2))
algorithm - Sorting in place - Stack Overflow In computer science, an in-place algorithm (or in Latin in situ) is an algorithm which transforms input using a data structure with a small, constant amount of extra storage space There are some technicalities specified in the In Computational Complexity section, but the conclusion is still that e g Quicksort requires O(log n) space (true
algorithm - What is the most efficient way of finding a path through a . . . The most commonly used algorithm for this problem is A* (A Star), which is a generalized Dijkstra's algorithm search with added heuristics - the purpose of the heuristics is to direct the search towards the search goal so that typical searches finish faster
algorithm - How to generate Sudoku boards with unique solutions - Stack . . . Unless P = NP, there is no polynomial-time algorithm for generating general Sudoku problems with exactly one solution In his master's thesis, Takayuki Yato defined The Another Solution Problem (ASP), where the goal is, given a problem and some solution, to find a different solution to that problem or to show that none exists
Understanding median of medians algorithm - Stack Overflow Instead, the median-of-medians algorithm will recursively call itself on the complete data set 50 45 40 35 30 25 20 15 10 Internally, this will split the group into blocks of five and sort them, etc , but it does so to determine the partition point for the partitioning step, and it's in this partitioning step that the recursive call will find
algorithm - Whats the difference between `git diff --patience` and . . . The region is split around the LCS, and the algorithm is recursively applied to the sections before and after the LCS By always selecting a LCS position with the lowest occurrence count, this algorithm behaves exactly like Bram Cohen's patience diff whenever there is a unique common element available between the two sequences
algorithm - How to find convex hull in a 3 dimensional space - Stack . . . Since the algorithm spends O(n) time for each convex hull vertex, the worst-case running time is O(n2) However, if the convex hull has very few vertices, Jarvis's march is extremely fast A better way to write the running time is O(nh), where h is the number of convex hull vertices
algorithm - What does O (log n) mean exactly? - Stack Overflow Algorithm 1: Algorithm 1 prints hello once and it doesn't depend on n, so it will always run in constant time, so it is O(1) print "hello"; Algorithm 2: Algorithm 2 prints hello 3 times, however it does not depend on an input size Even as n grows, this algorithm will always only print hello 3 times