diff options
Diffstat (limited to 'content/math/transforms/orTransform.cpp')
| -rw-r--r-- | content/math/transforms/orTransform.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/content/math/transforms/orTransform.cpp b/content/math/transforms/orTransform.cpp new file mode 100644 index 0000000..eb1da44 --- /dev/null +++ b/content/math/transforms/orTransform.cpp @@ -0,0 +1,8 @@ +void fft(vector<ll>& a, bool inv = false) { + int n = sz(a); + for (int s = 1; s < n; s *= 2) { + for (int i = 0; i < n; i += 2 * s) { + for (int j = i; j < i + s; j++) { + ll& u = a[j], &v = a[j + s]; + tie(u, v) = inv ? pair(v, u - v) : pair(u + v, u); +}}}} |