Chocolate Bar

*special problem, math

Sweepstake

*special problem, brute force, constructive algorithms, implementation, math

The Thorny Path

greedy, math

Game of Questions

bitmasks, combinatorics, dp, fft, math, probabilities

Fibonacci Number

brute force, math, matrices

Morrowindows

math, number theory

DIY Tree

graphs, greedy, math, probabilities

Replace All

combinatorics, dp, math

The Sum of Good Numbers

hashing, math, string suffix structures, strings

Perfect Encoding

fft, math

Tetragon

geometry, math

Divisibility Rules

math, number theory

Bosco and Particle

dp, math, number theory, strings

Rin and The Unknown Flower

constructive algorithms, greedy, interactive, math

GCD Master (easy version)

greedy, math, number theory, sortings

Survival of the Weakest (hard version)

greedy, math, sortings, two pointers

Journey

dp, math

Lasers and Mirrors

constructive algorithms, math

Not Quick Transformation

divide and conquer, math

Table

*special problem, greedy, implementation, math

Festival Organization

combinatorics, math, number theory

Tractor College

implementation, math, number theory, ternary search

Flags

dp, math, matrices

Roland and Rose

brute force, geometry, math, sortings

Ruminations on Ruminants

geometry, math

Fading into Fog

geometry, interactive, math, probabilities

Teamwork

constructive algorithms, greedy, math

Gregor and the Two Painters

data structures, divide and conquer, graphs, greedy, math

Mergesort Strikes Back

math, probabilities

Rotation

*special problem, geometry, math

Complete the Permutations

combinatorics, fft, graphs, math

Square Equation Roots

math

Upgrading Tree

constructive algorithms, dfs and similar, graphs, math, trees

Packmen Strike Back

binary search, dp, math

RC Kaboom Show

binary search, brute force, data structures, geometry, math

Swimmers in the Pool

dp, fft, math, number theory

Xor Permutations

constructive algorithms, math

Computer Game

dp, greedy, math, probabilities

Appleman and Complicated Task

dsu, math

Shortest path

brute force, geometry, math, shortest paths

Equal Product

data structures, math, number theory, two pointers

Pixels

constructive algorithms, math

Coins

math

A Stroll Around the Matrix

data structures, greedy, math

Boolean Computer

bitmasks, brute force, fft, math

Self-exploration

math

Digits

brute force, implementation, math

Min Cost Permutation (Hard Version)

binary search, constructive algorithms, data structures, greedy, math, sortings

Anti-Increasing Addicts

constructive algorithms, dp, greedy, math

Xor-Set

bitmasks, divide and conquer, math

Tournament Construction

constructive algorithms, dp, graphs, greedy, math

Bessie and Cards

combinatorics, dp, math

You Are Given Some Letters...

binary search, implementation, math

Tubular Bells

interactive, math, number theory, probabilities

Multithreading (Easy Version)

combinatorics, fft, math

Cowboys

combinatorics, dp, math

DZY Loves Games

math, matrices, probabilities

Random Elections

bitmasks, brute force, divide and conquer, fft, math

Summer Homework

data structures, math

Theft of Blueprints

graphs, math

Tiles

combinatorics, dp, fft, math

Visit of the Great

math, number theory

Game Bundles

brute force, constructive algorithms, dp, greedy, math

Strange town

constructive algorithms, math

Donkey and Stars

data structures, dp, geometry, math, sortings

Lesson Timetable

combinatorics, dp, math

Inverse Genealogy

constructive algorithms, divide and conquer, dp, math, trees

Wojtek and Card Tricks

math

Density of subarrays

dp, math

The Final Pursuit

bitmasks, constructive algorithms, divide and conquer, graphs, greedy, math

Savior

brute force, dsu, math

Slime and Sequences (Easy Version)

dp, fft, math

Red and Black Tree

dp, implementation, math

Two Policemen

*special problem, binary search, brute force, math

Omkar and Time Travel

data structures, math

Tetris revisited

constructive algorithms, graph matchings, greedy, math

A Perfect Problem

combinatorics, dp, math

Once in a casino

constructive algorithms, greedy, implementation, math

On Sum of Number of Inversions in Permutations

combinatorics, math

Coins Exhibition

data structures, dp, math

Igor and Interesting Numbers

brute force, combinatorics, dp, math

Sereja and Cinema

combinatorics, math

Prediction

combinatorics, dp, math

Location

data structures, dp, math, number theory

Horse Races

dp, math

Equal LCM Subsets

data structures, math, number theory

Pokermon League challenge

math, probabilities

Flatland Fencing

games, math

Minibuses on Venus (hard version)

brute force, combinatorics, dp, math

Around the World

bitmasks, combinatorics, dfs and similar, dp, graphs, graphs, math, trees

Candies for Children

brute force, math

Random Forest Rank

dp, graph matchings, math, trees

Expected Components

combinatorics, math, number theory, probabilities

Illumination

binary search, bitmasks, brute force, combinatorics, dp, math, two pointers

Permutation of Given

constructive algorithms, math

Strange Radiation

binary search, implementation, math

Gambling Nim

bitmasks, math, matrices, probabilities

Electrical Efficiency

combinatorics, data structures, dp, math, number theory, trees

Party Organization

brute force, math, probabilities

LCM

*special problem, implementation, math