Enormous XOR

bitmasks, constructive algorithms, greedy, math, strings, two pointers

Mercenaries

bitmasks, brute force, combinatorics, dp, dsu, math, two pointers

Sum the Fibonacci

bitmasks, divide and conquer, dp, fft, math

Omkar and Akmar

chinese remainder theorem, combinatorics, constructive algorithms, fft, games, geometry, math, meet-in-the-middle, string suffix structures

Destroy the Colony

combinatorics, dp, math

Positions in Permutations

combinatorics, dp, math

Twin Clusters

bitmasks, brute force, constructive algorithms, math, probabilities

Parametric MST

binary search, constructive algorithms, graphs, greedy, math, sortings

Xor-matic Number of the Graph

bitmasks, graphs, math, number theory, trees

Stranger Trees

dp, math, matrices, trees

Divide, XOR, and Conquer

bitmasks, dp, math

XOR Counting

bitmasks, combinatorics, dp, math

Three Days Grace

data structures, dp, greedy, math, number theory, two pointers

Awesome Substrings

math, strings

Emotional Fishermen

combinatorics, dp, math, two pointers

You

dfs and similar, dp, math, number theory

BFS Trees

combinatorics, dfs and similar, graphs, math, shortest paths, trees

Little Elephant and Broken Sorting

dp, math, probabilities

Crypto Lights

combinatorics, dp, math, probabilities

Deleting Numbers

interactive, math, number theory

Quantifier Question

dfs and similar, dp, graphs, math

Cards

combinatorics, dp, math, number theory, probabilities

Integer Game

constructive algorithms, games, interactive, math

Binary Table

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

The Sum of the k-th Powers

math

King's Path

*special problem, math, trees

Olympic Games

math

Deck-Building Game

divide and conquer, math

Little Elephant and Triangle

geometry, math

Journey

dp, math

Not Quick Transformation

divide and conquer, math

Flags

dp, math, matrices

Packmen Strike Back

binary search, dp, math

Digits

brute force, implementation, math

Savior

brute force, dsu, math

Igor and Interesting Numbers

brute force, combinatorics, dp, math

Sereja and Cinema

combinatorics, math

Horse Races

dp, math

Strange Radiation

binary search, implementation, math

Electrical Efficiency

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

Half-decay tree

data structures, divide and conquer, dp, math, probabilities

Write The Contest

binary search, dp, math

Gifts from Grandfather Ahmed

dp, math, number theory

Plane Tiling

geometry, implementation, math

Typewriter

brute force, math

A Shade of Moonlight

binary search, geometry, math, sortings, two pointers

Multiset of Strings

bitmasks, brute force, dp, fft, flows, graphs, math, meet-in-the-middle, trees

Vus the Cossack and a Field

divide and conquer, implementation, math

Memory and Casinos

data structures, math, probabilities

Inverse Transformation

constructive algorithms, implementation, math

Function Sum

brute force, combinatorics, dp, fft, math

Power or XOR?

bitmasks, combinatorics, math, number theory

Even Split

binary search, constructive algorithms, greedy, math

Geometers Anonymous Club

data structures, geometry, math, sortings

More Queries to Array...

data structures, math

New Year and Entity Enumeration

bitmasks, combinatorics, dp, math

Laboratory on Pluto

constructive algorithms, dp, greedy, math

Game

math

Serval and Music Game

brute force, dp, implementation, math, number theory

Cowslip Collections

combinatorics, math, number theory

Zeros and Ones

bitmasks, divide and conquer, dp, math

Brukhovich and Exams

brute force, greedy, implementation, math, sortings

The Neutral Zone

brute force, math

Baby Ehab Plays with Permutations

combinatorics, dp, math

The Tree Has Fallen!

bitmasks, dfs and similar, math, trees

Balancing Weapons

binary search, brute force, data structures, math, two pointers

Small Permutation Problem (Hard Version)

combinatorics, dp, math

Algebra Flash

bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees

Expected Square Beauty

dp, math, probabilities

DSU Master

combinatorics, dp, dsu, math

Christmas Game

bitmasks, data structures, dfs and similar, dp, games, math, trees

The Boss's Identity

binary search, bitmasks, data structures, dfs and similar, greedy, math, sortings

Case of a Top Secret

binary search, implementation, math

The Top Scorer

combinatorics, dp, math, probabilities

Coloring

combinatorics, constructive algorithms, implementation, math

Points

combinatorics, data structures, implementation, math, matrices

Ela Goes Hiking

combinatorics, dp, math, probabilities

In Search of Truth (Hard Version)

constructive algorithms, interactive, math, meet-in-the-middle, probabilities

Lottery

binary search, brute force, greedy, math, two pointers

K-Set Tree

combinatorics, dfs and similar, dp, math, trees

Narrow Components

brute force, data structures, dp, dsu, math, trees

Maximum Reduction

combinatorics, data structures, math

Curious Array

brute force, combinatorics, implementation, math

Necklace

constructive algorithms, math

Bags with Balls

combinatorics, dp, math, number theory

Gojou and Matrix Game

data structures, dp, games, hashing, implementation, math, number theory, sortings

Colored Balls

greedy, math, number theory

Cow and Treats

binary search, combinatorics, dp, greedy, implementation, math

Rare Coins

combinatorics, math, probabilities

New Year and Castle Construction

combinatorics, geometry, math, sortings

Nene vs. Monsters (Easy Version)

brute force, implementation, math

Two Arithmetic Progressions

math, number theory

Sports Betting

bitmasks, combinatorics, dp, graphs, math, probabilities

LCM Sum (hard version)

brute force, data structures, math, number theory, two pointers

Removing Graph

brute force, dp, games, graphs, math

Tokitsukaze and Permutations

dp, math

Boxes and Balls

dp, implementation, math

Construct Matrix

constructive algorithms, math

Xum

bitmasks, constructive algorithms, math, matrices, number theory

XOR Triangle

bitmasks, brute force, constructive algorithms, dp, greedy, math