Placing Rooks

combinatorics, fft, math

Mahmoud and a xor trip

bitmasks, constructive algorithms, data structures, dfs and similar, dp, math, trees

OpenStreetMap

data structures, two pointers

Funny Substrings

data structures, hashing, implementation, matrices, strings

Weird Game

games, greedy

Optimal Number Permutation

constructive algorithms

Dima and Bacteria

dsu, graphs, shortest paths

Euclid's nightmare

bitmasks, dfs and similar, dsu, graphs, greedy, math, sortings

Serega and Fun

data structures

Cards Sorting

data structures, implementation, sortings

Surrounded

geometry

Dwarves, Hats and Extrasensory Abilities

binary search, constructive algorithms, geometry, interactive

Bear and Tree Jumps

dfs and similar, dp, trees

Paired Payment

binary search, brute force, constructive algorithms, dp, flows, graphs, shortest paths

Convex Shape

constructive algorithms, implementation

Harmony Analysis

constructive algorithms

Boundary

brute force, math

Spelling Check

hashing, implementation, strings

Red-Blue Operations (Easy Version)

binary search, greedy, implementation, math

Telepanting

binary search, data structures, dp, sortings

GCD on a grid

brute force, dfs and similar, dp, implementation, math, number theory

Potion Brewing Class

dfs and similar, math, number theory, trees

DZY Loves Colors

data structures

Array Without Local Maximums

dp

Counting Rhyme

dp, math, number theory

How Many Paths?

dfs and similar, dp, graphs, trees

Encryption (easy)

brute force

Inversion SwapSort

constructive algorithms, greedy, sortings

Arithmetic Progression

binary search, interactive, number theory, probabilities

Tree with Small Distances

dp, graphs, greedy

Drazil and Tiles

constructive algorithms, greedy

Collective Mindsets (easy)

Ehab and another another xor problem

bitmasks, constructive algorithms, implementation, interactive

Malek Dance Club

combinatorics, math

Balanced String

dp

Video Cards

brute force, data structures, implementation, math, number theory

Destiny

data structures, probabilities

Rectangular Congruence

constructive algorithms, number theory

Portals

data structures, dp, greedy, implementation, sortings

Jon and Orbs

dp, math, probabilities

Simple XML

implementation

Guilty --- to the kitchen!

greedy, implementation

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

No Palindromes

brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings

Famil Door and Brackets

dp, strings

Testing Robots

implementation

Segments Removal

data structures, dsu, flows, implementation, two pointers

Turing Tape

implementation

Splitting money

implementation

Keyboard Purchase

bitmasks, dp

Anya and Cubes

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

Maximize Sum of Digits

*special problem, implementation, math

Permutations

greedy

Wet Shark and Blocks

dp, matrices

Rotate Columns (easy version)

bitmasks, brute force, dp, greedy, sortings

Queue

constructive algorithms, dp

STL

dfs and similar

Packmen

binary search, dp

Petr#

brute force, data structures, hashing, strings

Vowels

combinatorics, divide and conquer, dp

Robot Rapping Results Report

binary search, dp, graphs

Levko and Array

binary search, dp

Mike and Foam

bitmasks, combinatorics, dp, math, number theory

Sum of Digits

brute force, constructive algorithms, dp, greedy

Destruction of a Tree

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

Games with Rectangle

combinatorics, dp

Pseudorandom Sequence Period

*special problem, implementation, number theory

Train Hard, Win Easy

constructive algorithms, greedy, math, sortings

Ability To Convert

constructive algorithms, dp, greedy, math, strings

Jeff and Rounding

dp, greedy, implementation, math

Winter is here

combinatorics, dp, math, number theory

Brain Network (easy)

Unordered Subsequence

constructive algorithms, greedy

Shovel Sale

constructive algorithms, math

Choosing The Commander

bitmasks, data structures, trees

Contest Balloons

data structures, greedy

Tree Master

brute force, data structures, dfs and similar, trees

Chladni Figure

brute force, strings

Team Work

combinatorics, dp, math

Volleyball

shortest paths

Trees and Segments

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

Factorial

*special problem, implementation

Group Projects

dp

Double Profiles

graphs, hashing, sortings

Array Collapse

data structures, divide and conquer, dp, trees

Choosing Balls

dp

Pathwalks

data structures, dp, graphs

Complete The Graph

binary search, constructive algorithms, graphs, shortest paths

Berland Beauty

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

The Shortest Statement

graphs, shortest paths, trees

Domino (hard version)

constructive algorithms, implementation, math

Sum of Remainders

implementation, math, number theory

ConstructOR

bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory

Jerry's Protest

brute force, combinatorics, dp, probabilities

Sereja and Prefixes

binary search, brute force

Factory Repairs

data structures

Inna and Dima

dfs and similar, dp, graphs, implementation

Put Knight!

games, math

The LCMs Must be Large

bitmasks, brute force, constructive algorithms, math, number theory

Time Travel

binary search, graphs, shortest paths