Palindromifier

constructive algorithms, strings

Putting Bricks in the Wall

constructive algorithms, implementation

XORwice

bitmasks, greedy, math

Battle Lemmings

dp, greedy

Rescue Nibel!

combinatorics, data structures, sortings

Pokémon Army (hard version)

data structures, divide and conquer, dp, greedy, implementation

Pokémon Army (easy version)

constructive algorithms, dp, greedy

Rock and Lever

bitmasks, math

Cubes Sorting

math, sortings

Rain of Fire

binary search, data structures, dfs and similar, dsu, graphs, implementation

Decryption

constructive algorithms, implementation, math, number theory

Sage's Birthday (hard version)

binary search, brute force, constructive algorithms, greedy, sortings, two pointers

Sage's Birthday (easy version)

binary search, constructive algorithms, greedy, sortings

Killjoy

greedy, implementation, math

Stairs

brute force, constructive algorithms, greedy, implementation, math

Digit Game

games, greedy, implementation

Three Occurrences

data structures, divide and conquer, hashing, two pointers

Equal Product

data structures, math, number theory, two pointers

Expected Damage

binary search, combinatorics, probabilities

Trash Problem

data structures, implementation

Mortal Kombat Tower

dp, graphs, greedy, shortest paths

Negative Prefixes

greedy, sortings

Buying Torches

math

Two Arrays

greedy, math, sortings

Copy-paste

greedy, math

Showing Off

flows, graph matchings, greedy, implementation

Split

binary search, data structures, dp, greedy

Graph and Queries

data structures, dsu, graphs, implementation, trees

XOR Inverse

bitmasks, data structures, divide and conquer, dp, greedy, math, sortings, strings, trees

Make Them Equal

constructive algorithms, greedy, math

k-Amazing Numbers

binary search, data structures, implementation, two pointers

Cakes for Clones

dp

New Game Plus!

constructive algorithms, greedy, math

XOR-gun

bitmasks, brute force, constructive algorithms

Bouncing Ball

brute force, dp, implementation

Repainting Street

brute force, brute force, greedy

Prison Break

brute force, math

Roads and Ramen

data structures, trees

Solo mid Oracle

greedy, math, ternary search

Shurikens

data structures, greedy, implementation

Perform Easily

binary search, brute force, dp, implementation, sortings, two pointers

A New Technique

implementation

Finding Sasuke

constructive algorithms, math

No Game No Life

bitmasks, games, math, matrices

The Thorny Path

greedy, math

Poman Numbers

bitmasks, greedy, math, strings

Grime Zoo

brute force, greedy, implementation, strings

Peaceful Rooks

dfs and similar, dsu, graphs

Fair Numbers

brute force, number theory

In-game Chat

implementation

Subsequences of Length Two

dp, strings

Two Platforms

binary search, dp, sortings, two pointers

Decrease the Sum of Digits

greedy, math

Yet Another Array Restoration

brute force, math, number theory

Minimum Product

brute force, greedy, math

Yet Another Two Integers Problem

greedy, math

Bitwise Magic

dp, math

Rainbow Triples

binary search, data structures, flows, greedy

Clusterization Counting

combinatorics, dp, dsu, fft, graphs, trees

Two Different

constructive algorithms, divide and conquer

Avoid Rainbow Cycles

data structures, dsu, graphs, greedy, sortings, trees

Searchlights

binary search, brute force, data structures, dp, implementation, sortings, two pointers

Discrete Acceleration

binary search, dp, implementation, math, two pointers

Arrays Sum

constructive algorithms, greedy, math

Circle Coloring

constructive algorithms

Egor in the Republic of Dagestan

constructive algorithms, dfs and similar, dp, graphs, greedy, shortest paths

Discrete Centrifugal Jumps

data structures, dp, graphs

Chocolate Bunny

constructive algorithms, interactive, math, two pointers

Big Vova

brute force, greedy, math, number theory

Ahahahahahahahaha

constructive algorithms, math

Deleting Numbers

interactive, math, number theory

Three Sequences

constructive algorithms, data structures, greedy, math

Link Cut Centroids

constructive algorithms, dfs and similar, graphs, trees

Maximum Product

brute force, dp, greedy, implementation, sortings

Subset Mex

greedy, implementation, math

Array Cancellation

constructive algorithms, implementation

Permutation Forgery

constructive algorithms

Bricks

flows, graph matchings, graphs

Game of Pairs

constructive algorithms, dfs and similar, interactive, math, number theory

Fixed Point Removal

binary search, constructive algorithms, data structures, greedy, two pointers

Tree Tag

dfs and similar, dp, games, trees

Balanced Bitstring

implementation, strings

Chess Rush

*special problem, combinatorics, dp, implementation, math

Spring cleaning

*special problem, data structures, dfs and similar, graphs, trees

The Potion of Great Power

*special problem, 2-sat, binary search, data structures, graphs, interactive, sortings, two pointers

Star Trek

*special problem, combinatorics, dfs and similar, dp, games, graphs, matrices, trees

Roads

*special problem, geometry, sortings

Fancy Fence

*special problem, data structures, dsu, implementation, math, sortings

Reverse and Swap

binary search, bitmasks, data structures

Divide Square

data structures, geometry, implementation, sortings

Maximum Distributed Tree

dfs and similar, dp, greedy, implementation, math, number theory, sortings, trees

Mere Array

constructive algorithms, math, number theory, sortings

Ternary Sequence

constructive algorithms, greedy, math

Distance and Axis

constructive algorithms, math

Mercenaries

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

x-prime Substrings

brute force, dfs and similar, dp, string suffix structures, strings

Clear the Multiset

data structures, divide and conquer, dp, greedy

Zigzags

brute force, combinatorics, data structures, math, two pointers

Binary String Reconstruction

2-sat, brute force, constructive algorithms, greedy

RPG Protagonist

brute force, greedy, math