diff options
| author | mzuenni <mzuenni@users.noreply.github.com> | 2024-07-28 22:54:40 +0200 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2024-07-28 22:54:40 +0200 |
| commit | 8d11c6c8213f46f0fa19826917c255edd5d43cb1 (patch) | |
| tree | 96d75baff33d5a04b5a60f1a41f514a26c716874 /content/math/transforms/ntt.cpp | |
| parent | 8c33b4e0d3030cfed17fc64b4fe41133339f6d87 (diff) | |
Test (#4)
* update
* moved content in subdir
* rename file
* add test setup
* add test setup
* add github action
* automaticly test all cpp files
* timeout after 10s
* setulimit and dont zero memory
* test build pdf
* install latexmk
* update
* update
* ngerman
* fonts
* removed old code
* add first test
* added tests
* test in sorted order
* more tests
* simplified test
* more tests
* fix suffix tree
* fixes and improvements
* done ust lst directly
* fix swap
* add links to pdf
* fix constants
* add primorial
* add comment
* various improvements
* more tests
* added missing stuf
* more tests
* fix tests
* more tests
* more tests
* more tests
* fix recursion?
* test trie
* more tests
* only use python temporarily for listings
* only use python temporarily for listings
* more tests
* fix longestCommonSubstring
* more tests
* more tests
* made code more similiar
* fix?
* more tests
* more tests
* more tests
* add ahoCorasick test + limit 4GB stack size
* more tests
* fix test
* add additional test
* more tests
* more tests
* fix?
* better fix
* fix virtual tree
* more tests
* more tests
* recursive closest pair
* more tests
* decrease limit
* new tests
* more tests
* fix name
* more tests
* add test
* new test
* more tests
* more tests
* more tests
* more tests
* new test and content
* new code
* new code
* larger tests
* fix and test
* new test
* new test
* update pdf
* remove comments
* new test
* more tests
* more testcases
* more tests
* increased limit
* more tests
* more tests
* more tests
* new tests
* more tests
* shortened code
* new test
* add basic tests for bigint
* more tests
* removed old files
* new test
* ignore some files
* more auto more ccw
* fix test
* more tests
* fix
* new tests
* more tests
* more tests
* stronger test
* actually verify delaunay...
* more tests
* fix header
* more tests
* run tests parallel?
* test parralel?
* add --missing
* separate workflows
* test
* is the pdf checked?
* separate workflows
* fix workflow
* more workflows
---------
Co-authored-by: Yidi <noob999noob999@gmail.com>
Diffstat (limited to 'content/math/transforms/ntt.cpp')
| -rw-r--r-- | content/math/transforms/ntt.cpp | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/content/math/transforms/ntt.cpp b/content/math/transforms/ntt.cpp new file mode 100644 index 0000000..ca605d3 --- /dev/null +++ b/content/math/transforms/ntt.cpp @@ -0,0 +1,23 @@ +constexpr ll mod = 998244353, root = 3; + +void ntt(vector<ll>& a, bool inv = false) { + int n = sz(a); + auto b = a; + ll r = inv ? powMod(root, mod - 2, mod) : root; + + for (int s = n / 2; s > 0; s /= 2) { + ll ws = powMod(r, (mod - 1) / (n / s), mod), w = 1; + for (int j = 0; j < n / 2; j += s) { + for (int k = j; k < j + s; k++) { + ll u = a[j + k], t = a[j + s + k] * w % mod; + b[k] = (u + t) % mod; + b[n/2 + k] = (u - t + mod) % mod; + } + w = w * ws % mod; + } + swap(a, b); + } + if (inv) { + ll div = powMod(n, mod - 2, mod); + for (auto& x : a) x = x * div % mod; +}} |