---
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 $O(N\log^2N)$