Parking Lot

combinatorics, math

Benches

combinatorics, math

Challenge Pennants

combinatorics, math

Selection of Personnel

combinatorics, math

Lucky Numbers

combinatorics, math

Famil Door and Roads

combinatorics, data structures, dfs and similar, dp, probabilities, trees

Far Relative’s Birthday Cake

brute force, combinatorics, constructive algorithms, implementation

Jerry's Protest

brute force, combinatorics, dp, probabilities

Transforming Sequence

combinatorics, dp, fft, math

Wet Shark and Flowers

combinatorics, math, number theory, probabilities

Wet Shark and Bishops

combinatorics, implementation

Chocolate

combinatorics

Square Root of Permutation

combinatorics, constructive algorithms, dfs and similar, graphs, math

Pasha and Stick

combinatorics, math

Hamming Distance Sum

combinatorics, strings

Moodular Arithmetic

combinatorics, dfs and similar, dsu, math, number theory

Wilbur and Points

combinatorics, greedy, sortings

Present for Vitalik the Philatelist

combinatorics, math, number theory

Kolya and Tanya

combinatorics

Modulo Sum

combinatorics, data structures, dp, two pointers

Bots

combinatorics, dp, math, number theory

Lengthening Sticks

combinatorics, implementation, math

Pig and Palindromes

combinatorics, dp

Symmetric and Transitive

combinatorics, dp, math

Randomizer

combinatorics, geometry, probabilities

Gerald and Giant Chess

combinatorics, dp, math, number theory

Vitaly and Cycle

combinatorics, dfs and similar, graphs, math

Kyoya and Permutation

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

Kyoya and Colored Balls

combinatorics, dp, math

Vanya and Triangles

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

GukiZ and Binary Operations

combinatorics, implementation, math, matrices, number theory

Mike and Foam

bitmasks, combinatorics, dp, math, number theory

Tavas and SaDDas

bitmasks, brute force, combinatorics, implementation

Pluses everywhere

combinatorics, dp, math, number theory

Pasha and Pipe

binary search, brute force, combinatorics, dp, implementation

Ilya and Escalator

combinatorics, dp, math, probabilities

Mr. Kitayuta's Gift

combinatorics, dp, matrices, strings

Misha and Palindrome Degree

binary search, combinatorics, implementation

New Year Santa Network

combinatorics, dfs and similar, graphs, trees

Special Matrices

combinatorics, dp

Unbearable Controversy of Being

brute force, combinatorics, dfs and similar, graphs

Random Function and Tree

combinatorics, dp, trees

Riding in a Lift

combinatorics, dp

Random Teams

combinatorics, constructive algorithms, greedy, math

Dreamoon and WiFi

bitmasks, brute force, combinatorics, dp, math, probabilities

Increase Sequence

combinatorics, dp

Pashmak and Buses

combinatorics, constructive algorithms, math

Pashmak and Flowers

combinatorics, implementation, sortings

Bingo!

combinatorics, math, probabilities

Magic Trick

combinatorics, math, probabilities

Devu and Flowers

bitmasks, combinatorics, number theory

Jzzhu and Numbers

bitmasks, combinatorics, dp

Devu and Birthday Celebration

combinatorics, dp, math

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory

Random Task

binary search, bitmasks, combinatorics, dp, math

Mashmokh and Reverse Operation

combinatorics, divide and conquer

Mashmokh and ACM

combinatorics, dp, number theory

Curious Array

brute force, combinatorics, implementation, math

Beautiful Pairs of Numbers

combinatorics, dp

Roman and Numbers

bitmasks, brute force, combinatorics, dp, number theory

On Sum of Number of Inversions in Permutations

combinatorics, math

On Number of Decompositions into Multipliers

combinatorics, math, number theory

Yet Another Number Sequence

combinatorics, math, matrices

Vowels

combinatorics, divide and conquer, dp

Ksenia and Combinatorics

combinatorics, dp

Sereja and Cinema

combinatorics, math

Inna and Nine

combinatorics, greedy

Drawing Circles is Fun

combinatorics, geometry

Sereja and Intervals

combinatorics, dp

Matrix

combinatorics, data structures, implementation

Levko and Strings

combinatorics, dp

Compartments

combinatorics, constructive algorithms, greedy, implementation

Two Heaps

combinatorics, constructive algorithms, greedy, implementation, math, sortings

Jeff and Furik

combinatorics, dp, probabilities

Iahub and Permutations

combinatorics, math

Tourist Problem

combinatorics, implementation, math

Vasily the Bear and Painting Square

bitmasks, combinatorics, dp, implementation

Vasily the Bear and Beautiful Strings

combinatorics, math, number theory

Axis Walking

bitmasks, combinatorics, constructive algorithms, dp, meet-in-the-middle

Magic Five

combinatorics, math

The Red Button

combinatorics, dfs and similar, dsu, graphs, greedy

Black-and-White Cube

combinatorics, constructive algorithms

Ciel and Flowers

combinatorics, math

Malek Dance Club

combinatorics, math

White, Black and White Again

combinatorics, number theory

Olya and Graph

combinatorics, math

Beautiful Numbers

brute force, combinatorics

Yaroslav and Two Strings

combinatorics, dp

Greg and Caves

combinatorics, dp

Greg and Friends

combinatorics, dp, graphs, shortest paths

Shaass and Lights

combinatorics, number theory

Distinct Paths

brute force, combinatorics

Polo the Penguin and Trees

combinatorics, dfs and similar, trees

Polo the Penguin and Houses

combinatorics

Positions in Permutations

combinatorics, dp, math

Permutation Sum

bitmasks, combinatorics, dp, implementation, meet-in-the-middle

Cow Tennis Tournament

combinatorics, data structures, math

Dima and Horses

combinatorics, constructive algorithms, graphs

Dima and Two Sequences

combinatorics, math, sortings

Little Elephant and LCM

binary search, combinatorics, dp, math