4-point polyline

brute force, constructive algorithms, geometry, trees

DZY Loves Planting

binary search, dsu, trees

Adam and Tree

data structures, trees

Berland Federalization

dp, trees

Dungeons and Candies

dsu, graphs, greedy, trees

Furukawa Nagisa's Tree

binary search, divide and conquer, sortings, trees

k-Tree

dp, implementation, trees

Guess the Tree

bitmasks, constructive algorithms, dp, greedy, trees

Xor-tree

dfs and similar, trees

Big Problems for Organizers

data structures, graphs, trees

Mashmokh and Water Tanks

binary search, data structures, greedy, trees, two pointers

Hill Climbing

dfs and similar, geometry, trees

Two Rooted Trees

data structures, implementation, trees

On Changing Tree

data structures, graphs, trees

Propagating tree

data structures, dfs and similar, trees

Ksenia and Pawns

dfs and similar, graphs, implementation, trees

New Year Tree

data structures, divide and conquer, trees

Tree and Queries

data structures, dfs and similar, trees

Inna and Sequence

binary search, data structures, dp, trees

Choosing Subtree is Fun

binary search, data structures, dfs and similar, trees, two pointers

Vessels

data structures, dsu, implementation, trees

Valera and Elections

dfs and similar, graphs, trees

Pilgrims

dfs and similar, dp, trees

Apple Tree

dfs and similar, number theory, trees

Pumping Stations

brute force, dfs and similar, divide and conquer, flows, graphs, greedy, trees

Water Tree

data structures, dfs and similar, graphs, trees

Xenia and Tree

data structures, divide and conquer, trees

Xenia and Bit Operations

data structures, trees

Divisor Tree

brute force, number theory, trees

Book of Evil

dfs and similar, divide and conquer, dp, trees

Escaping on Beaveractor

data structures, implementation, trees

Ciel the Commander

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

Balance

constructive algorithms, dfs and similar, graphs, trees

Shaass the Great

dp, trees

Close Vertices

data structures, divide and conquer, trees

WTF?

*special problem, graph matchings, implementation, trees

Polo the Penguin and Trees

combinatorics, dfs and similar, trees

Sausage Maximization

bitmasks, data structures, trees

Game on Tree

implementation, math, probabilities, trees

Binary Tree on Plane

flows, trees

Little Girl and Problem on Trees

data structures, graphs, trees

Zero Tree

dfs and similar, dp, greedy, trees

Black and White Tree

constructive algorithms, dsu, graphs, greedy, trees

Little Elephant and Tree

data structures, dfs and similar, trees

Tree and Table

dfs and similar, dp, implementation, trees

World Eater Brothers

dfs and similar, dp, greedy, trees

T-decomposition

dfs and similar, graphs, greedy, trees

Cactus

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

Noble Knight's Path

data structures, trees

Choosing Capital for Treeland

dfs and similar, dp, graphs, trees

Alien DNA

data structures, dsu, trees

IT Restaurants

dfs and similar, dp, trees

Blood Cousins

binary search, data structures, dfs and similar, trees

Paint Tree

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

Cutting Figure

constructive algorithms, graphs, trees

Thwarting Demonstrations

binary search, data structures, trees

Fools and Roads

data structures, dfs and similar, trees

Archaeology

data structures, dfs and similar, trees

Beard Graph

data structures, dsu, trees

e-Government

data structures, dfs and similar, dp, strings, trees

Distance in Tree

dfs and similar, dp, trees

Garden

bitmasks, dp, graphs, trees

Freezing with Style

binary search, data structures, divide and conquer, trees

Maze

dfs and similar, dp, probabilities, trees

Spiders

dp, greedy, trees

Tree or not Tree

data structures, divide and conquer, implementation, trees

Party

dfs and similar, graphs, trees

Lucky Tree

dp, dsu, trees

Castle

dp, greedy, probabilities, sortings, trees

Help King

implementation, probabilities, trees

Leaders

dfs and similar, dsu, graphs, trees

Beautiful Road

dfs and similar, dp, dsu, graphs, implementation, sortings, trees

Genetic engineering

dp, string suffix structures, trees

Petya and Tree

binary search, dfs and similar, probabilities, sortings, trees

Pairs

dfs and similar, dp, dsu, graphs, implementation, trees

Beavermuncher-0xFF

dfs and similar, dp, dsu, greedy, trees

Gift

dsu, graphs, sortings, trees

Big Maximum Sum

data structures, dp, greedy, implementation, math, trees

Information Reform

dp, implementation, trees

Enemy is weak

data structures, trees

Eternal Victory

dfs and similar, graphs, greedy, shortest paths, trees

Caterpillar

dfs and similar, dp, graphs, trees

Galaxy Union

dp, trees, two pointers

Baldman and the military

dfs and similar, graphs, trees

Old Berland Language

data structures, greedy, trees

Ant on the Tree

constructive algorithms, dfs and similar, trees

Roads not only in Berland

dsu, graphs, trees

Scheme

dfs and similar, graphs, trees

Two Paths

dfs and similar, dp, graphs, shortest paths, trees, two pointers

Exposition

binary search, data structures, dsu, trees, two pointers