Problems

Easy · Math · Brute force

Very easy · Strings · Greedy algorithms

Very easy · Suffix Array · String suffix structures

Hard · Strings · Prefix Function · Z-function · Suffix Array

Very hard · Combinatorics · Dynamic programming

Very hard · Dynamic programming

Very easy · Suffix Array · Strings

Medium · Combinatorics · Strings

Very hard · String suffix structures · Trees · Strings · Combinatorics

Easy · Dynamic programming · Strings

Very hard · Suffix Array · Strings

Medium · Strings · Suffix Array

Hard · Fast Fourier transform · Number theory

Easy · Dynamic programming · String suffix structures

Very hard · Prefix Sums · Prefix Function

Easy · Prefix Sums · Geometry

Very hard · Brute force

Medium · Fast Fourier transform · Math

Very hard · Fast Fourier transform · Strings

Medium · Segment Tree

Hard · Geometry · Constructive Algorithms

Hard · Geometry · Constructive Algorithms · Binary Search

Hard · Geometry · Math · Optimization

Hard · Geometry

Easy · Geometry