Problems

Medium · Number theory · Dynamic programming

Very hard · Range queries · Segment Tree

Very easy · Dynamic programming

Very easy · Dynamic programming

Easy · Dynamic programming

Medium · Dynamic programming

Easy · Graphs

Very easy · String suffix structures · Suffix Array · Strings

Easy · Prefix Function

Easy · Number theory · Math

Easy · Number theory

Medium · Implementation · Data Structures · Queries

Easy · Data Structures · Binary Search · Dynamic programming

Easy · Hashing · Implementation

Medium · Trees

Very easy · Graphs

Medium · Trees · Depth-first Search · Shortest paths

Very hard · Graphs

Easy · Games

Easy · Number theory · Math

Medium · Data Structures · Implementation

Very easy · Prime factorization · Strings · Math

Easy · Dynamic programming · Prefix Sums

Hard · Math · Number theory

Very easy · Brute force · Math