Addition on Segments

bitmasks, data structures, divide and conquer, dp

Cactus to Tree

dp, graphs, trees

Perfect Groups

dp, math, number theory

Kuro and Topological Parity

dp

Kuro and GCD and XOR and SUM

binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees

Short Code

data structures, dp, greedy, strings, trees

Destruction of a Tree

constructive algorithms, dfs and similar, dp, greedy, trees

Bandit Blues

combinatorics, dp, fft, math

Pathwalks

data structures, dp, graphs

Alternating Tree

combinatorics, dfs and similar, divide and conquer, dp, probabilities, trees

Mahmoud and Ehab and yet another xor task

bitmasks, dp, math, matrices

Guard Duty (medium)

binary search, dp, greedy, sortings

Encryption (hard)

data structures, dp

Encryption (medium)

dp

Heaps

dp, trees

Path Counting

combinatorics, dp

Runner's Problem

dp, matrices, sortings

Almost Increasing Array

data structures, dp

Fibonacci String Subsequences

combinatorics, dp, matrices

Cashback

data structures, dp, greedy, math

Cutlet

data structures, dp

Erasing Substrings

bitmasks, dp, greedy

World of Tank

dp, greedy

Sleepy Game

dfs and similar, dp, games, graphs

Fafa and Ancient Mathematics

dfs and similar, dp, trees

A Preponderant Reunion

constructive algorithms, dp

Palindrome Partition

dp, string suffix structures, strings

Escape Through Leaf

data structures, dp, geometry

Team Work

combinatorics, dp, math

Tree

binary search, dp, trees

Coins Exhibition

data structures, dp, math

Minimal Subset Difference

dp

Wardrobe

dp, greedy

Divisibility

constructive algorithms, dp, greedy, number theory

Birds

dp

Tanks

dp, greedy, implementation

Stranger Trees

dp, math, matrices, trees

Pollywog

combinatorics, dp, matrices

Ember and Storm's Tree Game

combinatorics, dp, games, trees

Sum the Fibonacci

bitmasks, divide and conquer, dp, fft, math

Strongly Connected Tournament

dp, graphs, math, probabilities

Logical Expression

bitmasks, dp, shortest paths

New Year and Original Order

dp, math

New Year and Entity Enumeration

bitmasks, combinatorics, dp, math

New Year and Arbitrary Arrangement

dp, math, probabilities

Reverses

dp, string suffix structures, strings

Party

bitmasks, brute force, dp, graphs

Clear The Matrix

bitmasks, dp

Maximum Questions

data structures, dp, strings

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Square Subsets

bitmasks, combinatorics, dp, math

Ralph and Mushrooms

dp, graphs

Counting Arrays

combinatorics, dp, math, number theory

Sloth

dfs and similar, dp, graph matchings, trees

Mod Mod Mod

binary search, dp, math

Connecting Vertices

dp, graphs

Maximum Element

combinatorics, dp, math

Packmen Strike Back

binary search, dp, math

Numbers on the blackboard

combinatorics, dp

Delivery Club

binary search, data structures, dp

Awards For Contestants

brute force, data structures, dp

Yet Another Minimization Problem

divide and conquer, dp

Policeman and a Tree

dp, graphs, trees

Huge Strings

bitmasks, brute force, dp, implementation, strings

Hex Dyslexia

bitmasks, brute force, dp, graphs

Gotta Go Fast

binary search, dp

Fire

dp, sortings

Third Month Insanity

dp, probabilities, trees

Masha and Cactus

dp, trees

Eleventh Birthday

combinatorics, dp, math

Similar Words

dp, hashing, strings, trees

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

Salazar Slytherin's Locket

bitmasks, dp

Helga Hufflepuff's Cup

dp, trees

Michael and Charging Stations

binary search, dp, greedy

Bob and stages

dp, geometry

Casinos and travel

dp

Neural Network country

dp, matrices

Tournament Construction

constructive algorithms, dp, graphs, greedy, math

Arpa and a game with Mojtaba

bitmasks, dp, games

Days of Floral Colours

combinatorics, divide and conquer, dp, fft, math

Shake It!

combinatorics, dp, flows, graphs

Guards In The Storehouse

bitmasks, dp

On the Bench

combinatorics, dp

Leha and another game about graph

constructive algorithms, data structures, dfs and similar, dp, graphs

Winter is here

combinatorics, dp, math, number theory

Convex Countour

dp

Future Failure

dp, games

Round Subset

dp, math

Roads in the Kingdom

dfs and similar, dp, graphs, trees

Caramel Clouds

data structures, dp, sortings

The Bakery

binary search, data structures, divide and conquer, dp, two pointers

Perpetual Motion Machine

constructive algorithms, dp, graphs, implementation, math, trees

Singer House

combinatorics, dp, graphs, trees

Dirty Arkady's Kitchen

data structures, dp, graphs, shortest paths

String Compression

dp, hashing, string suffix structures, strings

Liar

binary search, dp, hashing, string suffix structures

Okabe and El Psy Kongroo

dp, matrices

Karen and Supermarket

brute force, dp, trees

An unavoidable detour for home

combinatorics, dp, graphs, shortest paths