FFT problems

Problem Name Online Judge Contest Difficulty Level
1 Fast Multiplication SPOJ 1
2 Polynomial Multiplication SPOJ 2
3 Very Fast Multiplication SPOJ 2
4 Furik and Rubik and Sub Array CodeChef 3
5 Maximum Self-Matching SPOJ 3
6 Arithmetic Progressions CodeChef 3
7 Golf Bot UVA 5
8 Buying Land CodeChef 6
9 Fuzzy Search Codeforces Codeforces Round #296 (Div. 1) 7
10 Binary Table Codeforces CROC 2016 - Final Round [Private, For Onsite Finalists Only] 7
11 DZY Loves FFT Codeforces Codeforces Round #254 (Div. 1) & Codeforces Round #254 (Div. 2) 7
12 Thief in a Shop Codeforces Educational Codeforces Round 9 7
13 The Child and Binary Tree Codeforces Codeforces Round #250 (Div. 1) 8
14 Painting Square Codeforces Codeforces Round #181 (Div. 2) 8
15 Ladies' Shop Codeforces Codeforces Round #176 (Div. 1) 8
16 Design New Capital UVA 8
17 Dasha and cyclic table Codeforces Codeforces Round #390 (Div. 2) 9
18 Tile Cutting UVA 9
19 Design Tutorial: Increase the Constraints Codeforces Codeforces Round #270 9
20 Transforming Sequence Codeforces AIM Tech Round (Div. 1) 9
21 Nephren Runs a Cinema Codeforces Codeforces Round #449 (Div. 1) 10
22 Kyoya and Train Codeforces Codeforces Round #309 (Div. 1) 10
23 Days of Floral Colours Codeforces Codeforces Round #431 (Div. 1) 10