Problems
Sum of squares#5897
Medium · Math
How many multiples#5898
Easy · Math
Multiplication#5899
Hard · Implementation
Multifactorial#5900
Easy · Dynamic programming
Discrete Fourier Transform#5901
Easy · Fast Fourier transform · Implementation
Reverse order#5902
Very easy · Binary Search
Distinct Sums#5903
Easy · Brute force · Prefix Sums
Multifactorial - 2#5904
Very easy · Math · Implementation
Roots from one#5905
Very easy · Math
Discrete Fourier Transform - 2#5906
Medium · Fast Fourier transform · Math
Square root#5907
Easy · Implementation
Dictionary search#5908
Hard · Strings · Prefix Function
Fibonacci Strings#5909
Medium · Strings · Dynamic programming
Isomorphisms#5910
Hard · Hashing · Strings
Palindrome row#5911
Easy · Combinatorics
Suffix Game#5912
Easy · Strings
Number of Distinct Substrings#5913
Hard · String suffix structures · Suffix Array
Suffix tree in line#5914
Easy · Suffix Array
Vertices of the implicit suffix tree#5915
Easy · Strings
Suffixes of one string#5916
Very easy · Strings
Zebra - also a horse#5917
Very easy · Strings
Happy Sum 3#5918
Easy · Dynamic programming
Fibonacci haters' nim 2. Peter strikes back!#5919
Very hard · Games · Dynamic programming · Prefix Sums · Bitwise Operations
Mr. Chudakov's Buses#5920
Very easy · Graphs · Dynamic programming
Word number#5921
Easy · Brute force · Strings