---
id: fft
title: "Introduction to Fast Fourier Transform"
author: Benjamin Qi
prerequisites:
description: "?"
frequency: 0
## FFT
### Tutorial
- [cp-algo - FFT](https://cp-algorithms.com/algebra/fft.html)
- [CSA - FFT and Variations](https://csacademy.com/blog/fast-fourier-transform-and-variations-of-it/)
- [CF Tutorial Pt 1](http://codeforces.com/blog/entry/43499)
- [CF Tutorial Pt 2](http://codeforces.com/blog/entry/48798)
- [CF adamant](http://codeforces.com/blog/entry/55572)
### Problems
- [K-Inversions](https://open.kattis.com/problems/kinversions)
- [Big Integer](https://dmoj.ca/problem/bts17p8)
- [Matchings](https://open.kattis.com/contests/acpc17open/problems/matchings)
- [Counting Triplets](https://toph.co/p/counting-triplets)
- [Alien Codebreaking](https://open.kattis.com/problems/aliencodebreaking)
- base conversion in $O(N\log^2N)$
