Babaei and Birthday Cake

data structures, dp

Famil Door and Brackets

dp, strings

Optimal Number Permutation

constructive algorithms

Wet Shark and Blocks

dp, matrices

New Year Tree

bitmasks, data structures, trees

Hexagons

binary search, implementation, math

Multipliers

math, number theory

Running Track

dp, greedy, strings, trees

Skills

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

Peter and Snow Blower

binary search, geometry, ternary search

New Year and Ancient Prophecy

dp, hashing, strings

Minimum spanning tree for each edge

data structures, dfs and similar, dsu, graphs, trees

Gadgets for dollars and pounds

binary search, greedy, two pointers

Zuma

dp

Lipshitz Sequence

data structures, math

Area of Two Circles' Intersection

geometry

Spongebob and Squares

brute force, math

Chocolate Bar

brute force, dp

Subsequences

data structures, dp

Chip 'n Dale Rescue Rangers

binary search, geometry, math

Duff in Beach

dp

Once Again...

constructive algorithms, dp, matrices

Weakness and Poorness

ternary search

Modulo Sum

combinatorics, data structures, dp, two pointers

Points on Plane

constructive algorithms, divide and conquer, geometry, greedy, sortings

Invariance of Tree

constructive algorithms, dfs and similar, greedy, trees

Bulbo

dp, greedy

Minimization

dp, greedy, sortings

Lengthening Sticks

combinatorics, implementation, math

Symmetric and Transitive

combinatorics, dp, math

Restructuring Company

data structures, dsu

Amr and Chemistry

brute force, graphs, greedy, math, shortest paths

Vitaly and Cycle

combinatorics, dfs and similar, graphs, math

Arthur and Table

brute force, data structures, dp, greedy, math, sortings

Case of Fugitive

data structures, greedy, sortings

Kyoya and Permutation

binary search, combinatorics, constructive algorithms, greedy, implementation, math

Vanya and Brackets

brute force, dp, expression parsing, greedy, implementation, strings

Vanya and Triangles

brute force, combinatorics, data structures, geometry, math, sortings

Vanya and Scales

brute force, dp, greedy, math, meet-in-the-middle, number theory

GukiZ and Binary Operations

combinatorics, implementation, math, matrices, number theory

Regular Bridge

constructive algorithms, graphs, implementation

Degenerate Matrix

binary search, math

Haar Features

greedy, implementation

Mike and Feet

binary search, data structures, dp, dsu

Soldier and Traveling

flows, graphs, math

Paths and Trees

graphs, greedy, shortest paths

Destroying Roads

constructive algorithms, graphs, shortest paths

Quest

dp, greedy

Idempotent functions

constructive algorithms, graphs, math

Infinite Inversions

binary search, data structures, implementation, sortings, trees

Bad Luck Island

dp, probabilities

Ice Cave

dfs and similar

Tavas and Malekas

greedy, hashing, string suffix structures, strings

Tavas and Karafs

binary search, greedy, math

Handshakes

binary search, constructive algorithms, data structures, greedy

Work Group

dfs and similar, dp, graphs, strings, trees

Points in triangle

*special problem, geometry

Levenshtein distance

*special problem

Jumping frogs

*special problem

Group Photo 2 (online mirror version)

brute force, greedy, sortings

Om Nom and Candies

brute force, greedy, math

Anya and Cubes

binary search, bitmasks, brute force, dp, math, meet-in-the-middle

Social Network

greedy, two pointers

The Art of Dealing with ATM

binary search, sortings

Closest Equals

*special problem, data structures

Chicken or Fish?

greedy

Cubes

games, greedy, implementation

A and B and Lecture Rooms

binary search, data structures, dfs and similar, dp, trees

Drazil and Tiles

constructive algorithms, greedy

R2D2 and Droid Army

binary search, data structures, two pointers

Watto and Mechanism

binary search, data structures, hashing, string suffix structures, strings

Second price auction

bitmasks, probabilities

Fox And Jumping

bitmasks, brute force, dp, math

Pretty Song

math, strings

Sums of Digits

dp, greedy, implementation

Breaking Good

dfs and similar, dp, graphs, shortest paths

Mr. Kitayuta, the Treasure Hunter

dfs and similar, dp, two pointers

Misha and Permutations Summation

data structures

New Year Santa Network

combinatorics, dfs and similar, graphs, trees

Array and Operations

flows, graph matchings, number theory

Distributing Parts

greedy, sortings

Tennis Game

binary search

Obsessive String

dp, strings

Vanya and Field

math

New York Hotel

greedy, math

Restoring Increasing Sequence

binary search, brute force, greedy, implementation

Chocolate

brute force, dfs and similar, math, meet-in-the-middle, number theory

Special Matrices

combinatorics, dp

Candy Boxes

brute force, constructive algorithms, math

Strip

binary search, data structures, dp, two pointers

Valid Sets

dfs and similar, dp, math, trees

Maximum Value

binary search, math, sortings, two pointers

Riding in a Lift

combinatorics, dp

Red-Green Towers

dp

Dreamoon and Sets

constructive algorithms, greedy, math

CGCDSSQ

brute force, data structures, math

Kamal-ol-molk's Painting

brute force, constructive algorithms, greedy

Ant colony

data structures, math, number theory

Pillars

binary search, data structures, dp, sortings, trees

Captain Marmot

brute force, geometry