Min-Fund Prison (Medium)

brute force, dfs and similar, dp, graphs, trees

Trails (Hard)

dp, matrices

Division + LCP (hard version)

binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings

Reverse Card (Hard Version)

brute force, math, number theory

Chain Reaction

binary search, data structures, dsu, greedy, implementation, math, number theory

Dating

greedy, sortings, trees

Girl Permutation

combinatorics, dp, math, number theory

Duplicates

Vlad and Avoiding X

bitmasks, brute force, dfs and similar, dp, implementation

Mischievous Shooter

brute force, data structures, divide and conquer, dp, implementation

ace5 and Task Order

constructive algorithms, divide and conquer, implementation, interactive, probabilities, sortings

Evaluate It and Back Again

constructive algorithms, implementation, math

Small Permutation Problem (Easy Version)

brute force, combinatorics, dp, math

Lights

brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation

Twin Friends

combinatorics, dp

Compressed Tree

dfs and similar, dp, graphs, greedy, sortings, trees

Sofia and Strings

data structures, greedy, sortings, strings, two pointers

Salyg1n and Array (hard version)

constructive algorithms, interactive

Balanced String

dp

Trees and Segments

brute force, data structures, dp, greedy, two pointers

Earn or Unlock

bitmasks, brute force, dp

Vika and Bonuses

binary search, brute force, math, ternary search

Fill the Matrix

data structures, greedy, math

In Search of Truth (Easy Version)

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

Railguns

brute force, dfs and similar, dp, graphs

Playoff Fixing

combinatorics, trees

Combinatorics Problem

brute force, combinatorics, dp

Magic Triples (Hard Version)

brute force, data structures, math, number theory

Between

constructive algorithms, dfs and similar, graphs, greedy

Vlad and the Nice Paths (hard version)

binary search, combinatorics, data structures, dp, math, two pointers

Minibuses on Venus (easy version)

combinatorics, divide and conquer, dp

Tree Master

brute force, data structures, dfs and similar, trees

Symmetree

dfs and similar, hashing, implementation, trees

Explosions?

binary search, data structures, dp, greedy, math

Serval and Shift-Shift-Shift

bitmasks, brute force, constructive algorithms, implementation

Sum Over Zero

data structures, dfs and similar, dp

Monsters (hard version)

data structures, greedy

Edge Reverse

binary search, dfs and similar, graphs, trees

Vittorio Plays with LEGO Bricks

dp, geometry

BinCoin

binary search, divide and conquer, hashing, implementation, probabilities, trees

Gaining Rating

binary search, greedy, implementation, math, sortings, two pointers

Игра в Девятку II

*special problem, brute force

Hospital Queue

binary search, graphs, greedy, implementation

Chemistry Lab

dp, geometry, probabilities

Node Pairs

dp, graphs, math, number theory

Valid Bitonic Permutations

combinatorics, dp, implementation, math, number theory

Kirill and Company

bitmasks, brute force, dfs and similar, dp, flows, graphs, shortest paths

Ela and the Wiring Wizard

brute force, dp, graphs, greedy, implementation, shortest paths

Equal Binary Subsequences

constructive algorithms, geometry, greedy, implementation, strings

Prefixes and Suffixes

constructive algorithms, strings, two pointers

Prefix Function Queries

dfs and similar, dp, hashing, string suffix structures, strings, trees

Madoka and The Best University

math, number theory

Count Seconds

brute force, constructive algorithms, dp, graphs, implementation, math

Tree Queries (Easy Version)

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

notepad.exe

binary search, constructive algorithms, greedy, interactive

Hemose on the Tree

bitmasks, constructive algorithms, dfs and similar, trees

Interactive Treasure Hunt

brute force, constructive algorithms, geometry, interactive, math

Fancy Stack

combinatorics, dp, implementation

AND-MEX Walk

bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs

Star MST

combinatorics, dp, graph matchings, math

Equal Tree Sums

constructive algorithms, dfs and similar, math, trees

Vitaly and Advanced Useless Algorithms

dp, greedy, implementation

Power Board

brute force, dp, math, number theory

Anonymity Is Important

binary search, brute force, data structures, dsu, greedy, sortings

Cars

2-sat, constructive algorithms, dfs and similar, dsu, graphs, greedy, sortings

Paint the Middle

dp, greedy, sortings, two pointers

Not Escaping

data structures, dp, implementation, shortest paths, two pointers

Math Test

bitmasks, brute force, greedy

Trader Problem

data structures, dsu, greedy, sortings

Lexicographically Small Enough

brute force, data structures, greedy, strings

X(or)-mas Tree

bitmasks, dfs and similar, dsu, graphs, trees

Banquet Preparations 2

greedy, sortings, two pointers

Banquet Preparations 1

greedy

Changing Brackets

constructive algorithms, data structures, dp, greedy

Moment of Bloom

constructive algorithms, dfs and similar, graph matchings, graphs, greedy, trees

Train Maintenance

brute force, data structures, implementation

Minimal Coverage

dp

Knitting Batik

implementation, math

Holiday Wall Ornaments

dp, strings

GCD Festival

math, number theory

Non-Decreasing Dilemma

data structures, divide and conquer, math

Two Hundred Twenty One (hard version)

data structures, math

Mocha and Stars

combinatorics, dp, fft, math, number theory

Ezzat and Grid

data structures, dp, greedy

Equilibrium

data structures, dp, greedy

Telepanting

binary search, data structures, dp, sortings

Equidistant Vertices

brute force, combinatorics, dfs and similar, dp, trees

RPD and Rap Sheet (Hard Version)

brute force, constructive algorithms, interactive, math

Priority Queue

combinatorics, dp, implementation, math, ternary search

Figure Fixing

constructive algorithms, dfs and similar, dsu, graphs, greedy, math

Erase and Extend (Hard Version)

binary search, data structures, greedy, hashing, string suffix structures, strings, two pointers

Gold Transfer

binary search, data structures, dp, greedy, interactive, trees

Kill Anton

brute force, constructive algorithms, data structures, math, strings

To Go Or Not To Go?

brute force, dfs and similar, graphs, greedy, implementation, shortest paths

Guess the K-th Zero (Hard version)

binary search, constructive algorithms, data structures, interactive

Phoenix and Computers

combinatorics, dp, math

Mysterious language again, seriously?

*special problem

Math

*special problem, math

Travelling Salesman Problem

binary search, data structures, dp, greedy, shortest paths, sortings, two pointers

Two chandeliers

binary search, brute force, chinese remainder theorem, math, number theory