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c++ Programming Glossary: n^2Fastest way to Find a m x n submatrix in M X N matrix http://stackoverflow.com/questions/10529278/fastest-way-to-find-a-m-x-n-submatrix-in-m-x-n-matrix on the average less comparisons than the size of the text n^2 m using m^2 extra space. Basically it uses multiple string matching.. matching on only n m rows of the text. It runs in at most 2n^2 time and is close to the optimal n^2 time for many patterns... It runs in at most 2n^2 time and is close to the optimal n^2 time for many patterns. It steadily extends to an alphabet independent..
http://stackoverflow.com/questions/13216041/number-of-tuples you can use this algorithm with time complexity O n^2 log n . Sort the N numbers using your favorite efficient sorting.. c int length b ^2 Compute the sums of all of the numbers O n^2 for int i 0 i length b i for int j i j length b j c i length.. you can do the sorts in place if you are comfortable O n^2 log n d sort c For each number in your list grab the list of..
Kd tree: data stored only in leaves vs stored in leaves and nodes http://stackoverflow.com/questions/14292585/kd-tree-data-stored-only-in-leaves-vs-stored-in-leaves-and-nodes tree is done by a specialized QuickSort. In theory it's O n^2 worst case but with a good heuristic such as median of 5 you..
Running Time For Insertion Sort http://stackoverflow.com/questions/14493978/running-time-for-insertion-sort The inner loop get executed 1 2 3 4 5 6 .... n 1 times. O n^2 a j tmp This statement get executed n times. O n I'm not sure..
Fast bignum square computation http://stackoverflow.com/questions/18465326/fast-bignum-square-computation If I understand your algorithm correctly it seems O n^2 where n is the number of digits. Have you looked at Karatsuba..
How many palindromes can be formed by selections of characters from a string? http://stackoverflow.com/questions/2033903/how-many-palindromes-can-be-formed-by-selections-of-characters-from-a-string to solve this in O n^3 time. This will require O n^2 additional memory. Note that for long strings even 64 bit ints..
Best way to get the index of an iterator? http://stackoverflow.com/questions/2152986/best-way-to-get-the-index-of-an-iterator you could easily end up turning an O n algorithm into an O n^2 algorithm. Another option if you don't jump around in the container..
removing subset transactions form file http://stackoverflow.com/questions/2793277/removing-subset-transactions-form-file s1.end You could create a set of sets and then do a n^2 amount of include tests to remove the duplicates. Be sure to..
How does one remove duplicate elements in place in an array in O(n) in C or C++? http://stackoverflow.com/questions/3432760/how-does-one-remove-duplicate-elements-in-place-in-an-array-in-on-in-c-or-c can be achieved using two for loops but that would be O n^2 I believe. c c algorithm share improve this question If..
find four elements in array whose sum equal to a given number X [closed] http://stackoverflow.com/questions/3569504/find-four-elements-in-array-whose-sum-equal-to-a-given-number-x elements in array whose sum equal to a given number X in O n^2 log n prefer in pseudo code or c c c c algorithm share improve.. share improve this question You can do it in O n^2 . Works fine with duplicated and negative numbers. edit as Andre.. balanced tree TreeMap in java and get guaranteed stable O n^2 log n solution. Hashtable sums will store all possible sums..
http://stackoverflow.com/questions/408670/stack-static-and-heap-in-c to by themselves. Offhand I'd guess that to be an O n^2 operation but whatever it is it can get bad if you are at all..
http://stackoverflow.com/questions/9039308/openmp-parallel-performance points so the best algorithm I thought of till now cost O n^2 and the performance of my algorithm using openmp using 10 thread..
Running Time For Insertion Sort http://stackoverflow.com/questions/14493978/running-time-for-insertion-sort overall complexity of insertion sort is quadratic ie.e. O N^2 . Your code integrates the swapping and searching for an insertion..
Count the number of adjacent boxes http://stackoverflow.com/questions/17328004/count-the-number-of-adjacent-boxes share improve this question A naive solution requires O N^2 where N is the number of rectangle here is how to do it faster...
Fast bignum square computation http://stackoverflow.com/questions/18465326/fast-bignum-square-computation results are massively slower even than by use of simple O N^2 multiplication. probably because of that horrible recursion.. smaller numbers is slightly less then half speed of my O N^2 multiplication. for bigger numbers is faster with the ratio..
Given a word and a text, we need to return the occurrences of anagrams http://stackoverflow.com/questions/18811511/given-a-word-and-a-text-we-need-to-return-the-occurrences-of-anagrams it and increase the number of occurrences but that is O N^2 approach. I'm looking for a better complexity. c algorithm..
http://stackoverflow.com/questions/2432669/test-if-a-number-is-fibonacci nice test is that N is a Fibonacci number if and only if 5 N^2 4 or 5N^2 4 is a square number. For ideas on how to efficiently.. is that N is a Fibonacci number if and only if 5 N^2 4 or 5N^2 4 is a square number. For ideas on how to efficiently test that..
Determining if an unordered vector<T> has all unique elements http://stackoverflow.com/questions/2769174/determining-if-an-unordered-vectort-has-all-unique-elements there is a large degeneracy the operation seems to take O N^2 time. For the nested iterator approach the opposite seems to.. it is lighting fast if X 0 X 1 but takes understandably O N^2 time if all the elements are unique. Is there a better way to.. a faster O is possible. The second example is obviously O N^2 . The coefficient and memory usage are low so it might be faster..
OpenMP: What is the benefit of nesting parallelizations? http://stackoverflow.com/questions/4317551/openmp-what-is-the-benefit-of-nesting-parallelizations 2 level parallelism the total number of threads would be N^2 where N OMP_NUM_THREADS . Such nested parallelism will cause..
Mapping elements in 2D upper triangle and lower triangle to linear structure http://stackoverflow.com/questions/4803180/mapping-elements-in-2d-upper-triangle-and-lower-triangle-to-linear-structure formula that will map a M min i j min i j into a range 0 N^2 2 Below is a mapping of a 3x3 matrix with indexes for K linear..
Algorithm for slicing planes (in place) out of an array of RGB values http://stackoverflow.com/questions/8465950/algorithm-for-slicing-planes-in-place-out-of-an-array-of-rgb-values vector is ready to continue transposing. This variant is O N^2 instead of O N . Edit2 PREFITCH optimization is not difficult..
Why is it not good to use recursive inheritance for std::tuple implementations? http://stackoverflow.com/questions/9641699/why-is-it-not-good-to-use-recursive-inheritance-for-stdtuple-implementations I.e. the recursive implementation could result in O N^2 compile time while the non recursive implementation is still..
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