Jzzhu and Apples

constructive algorithms, number theory

Anton and Letters

constructive algorithms, implementation

Valera and Swaps

constructive algorithms, dsu, graphs, implementation, math, string suffix structures

Valera and Tubes

constructive algorithms, dfs and similar, implementation

Devu and Partitioning of the Array

brute force, constructive algorithms, implementation, number theory

Square Tiling

constructive algorithms, greedy

Points and Segments (easy)

constructive algorithms, sortings

Guess the Tree

bitmasks, constructive algorithms, dp, greedy, trees

Biathlon Track

binary search, brute force, constructive algorithms, data structures, dp

Pasha and Hamsters

constructive algorithms, implementation

Square Table

constructive algorithms, math, probabilities

Football

constructive algorithms, graphs, implementation

Mashmokh and Numbers

constructive algorithms, number theory

A + B Strikes Back

*special problem, brute force, constructive algorithms, dsu, implementation

Searching for Graph

brute force, constructive algorithms, graphs

Team

constructive algorithms, greedy, implementation

Tree and Array

constructive algorithms

Cards

constructive algorithms, implementation

On Corruption and Numbers

constructive algorithms, implementation, math

Dominoes

constructive algorithms, greedy

Inna and Sweet Matrix

constructive algorithms

Fox and Minimal path

bitmasks, constructive algorithms, graphs, implementation, math

New Year Present

constructive algorithms, implementation

Broken Monitor

brute force, constructive algorithms, greedy, implementation

Mittens

constructive algorithms, greedy, sortings

Valera and Contest

constructive algorithms, implementation, math

Levko and Permutation

constructive algorithms, math, number theory

Levko and Table

constructive algorithms, implementation

Neatness

constructive algorithms, dfs and similar

Permutation

constructive algorithms, dp, math

Table

constructive algorithms, greedy, implementation

Dima and Containers

constructive algorithms, greedy, implementation

Flag Day

constructive algorithms, implementation

Bags and Coins

bitmasks, constructive algorithms, dp, greedy

Compartments

combinatorics, constructive algorithms, greedy, implementation

Vasya and Digital Root

constructive algorithms, implementation

Lucky Number Representation

constructive algorithms, dfs and similar, dp

Queue

constructive algorithms, dp

Two Heaps

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

Wrong Floyd

brute force, constructive algorithms, dfs and similar, graphs

Difference Row

constructive algorithms, implementation, sortings

Candies Game

constructive algorithms, greedy

Three Swaps

constructive algorithms, dfs and similar, greedy

Xenia and Weights

constructive algorithms, dfs and similar, dp, graphs, greedy, shortest paths

Palindrome

constructive algorithms, dp

Banana

binary search, constructive algorithms, greedy

Lucky Tickets

brute force, constructive algorithms

Deja Vu

constructive algorithms, dp

Deja Vu

constructive algorithms, graphs, implementation

Road Construction

constructive algorithms, graphs

The Evil Temple and the Moving Rocks

constructive algorithms

Graph Reconstruction

constructive algorithms

Purification

constructive algorithms, greedy

Axis Walking

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

Block Tower

constructive algorithms, dfs and similar, graphs

Tournament-graph

constructive algorithms, graphs

Black-and-White Cube

combinatorics, constructive algorithms

Ciel the Commander

constructive algorithms, dfs and similar, divide and conquer, greedy, trees

Princess and Her Shadow

constructive algorithms, shortest paths

Balance

constructive algorithms, dfs and similar, graphs, trees

Suns and Rays

constructive algorithms, dfs and similar, implementation

Ilya and Two Numbers

constructive algorithms, data structures, dsu, greedy

Ilya and Matrix

constructive algorithms, greedy, implementation, sortings

The Closest Pair

constructive algorithms, implementation

Polygon

constructive algorithms, geometry

Strange Addition

brute force, constructive algorithms, implementation

Lucky Permutation Triple

constructive algorithms, implementation, math

Yaroslav and Algorithm

constructive algorithms

Yaroslav and Sequence

constructive algorithms

Array

brute force, constructive algorithms, implementation

Color the Carpet

constructive algorithms

Splitting the Uniqueness

constructive algorithms

Fish Weight

constructive algorithms, greedy

Parity Game

constructive algorithms

HQ

*special problem, constructive algorithms

Ladies' Shop

constructive algorithms, fft, math

Lucky Permutation

constructive algorithms, math

Cows and Sequence

constructive algorithms, data structures, implementation

XOR and OR

constructive algorithms, implementation, math

Set of Points

constructive algorithms, geometry

Convex Shape

constructive algorithms, implementation

Dima and Horses

combinatorics, constructive algorithms, graphs

Three Horses

constructive algorithms, math, number theory

Secret

constructive algorithms, implementation

Flawed Flow

constructive algorithms, flows, graphs, greedy

Beautiful Sets of Points

constructive algorithms, implementation

Below the Diagonal

constructive algorithms, greedy, math

Queue at the School

constructive algorithms, graph matchings, implementation, shortest paths

Escape from Stones

constructive algorithms, data structures, implementation, two pointers

Maxim and Matrix

constructive algorithms, dp, math

Black and White Tree

constructive algorithms, dsu, graphs, greedy, trees

Balls and Boxes

constructive algorithms, greedy, implementation

Cards with Numbers

constructive algorithms, sortings

Beauty Pageant

brute force, constructive algorithms, greedy

Buggy Sorting

constructive algorithms, greedy, sortings

Restoring Table

constructive algorithms, greedy

Challenging Balloons

constructive algorithms

Boring Partition

constructive algorithms

Not Wool Sequences

constructive algorithms, math

Merging Two Decks

constructive algorithms, greedy