Archaeology

dfs and similar, trees

e-Government

data structures, dfs and similar, strings, trees

Beard Graph

data structures, dsu, trees

Distance in Tree

divide and conquer, dp, trees

Garden

bitmasks, dp, graphs, trees

Freezing with Style

divide and conquer, trees

Spiders

dp, trees

Tree or not Tree

data structures, divide and conquer, implementation, trees

Petr#

data structures, dp, hashing, string suffix structures, strings, trees

Lucky Tree

combinatorics, dfs and similar, trees

Lucky Tree

dsu, math, trees

Castle

dp, greedy, probabilities, sortings, trees

Help King

implementation, probabilities, trees

Leaders

dfs and similar, dsu, graphs, trees

Newspaper Headline

binary search, trees

Beautiful Road

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

Genetic engineering

dp, string suffix structures, trees

Petya and Tree

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

Pairs

dp, trees

Beavermuncher-0xFF

dfs and similar, dp, greedy, trees

Gift

dsu, graphs, sortings, trees

Information Reform

dp, implementation, trees

Eternal Victory

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

Caterpillar

dfs and similar, dp, graphs, trees

Galaxy Union

trees

Ant on the Tree

constructive algorithms, dfs and similar, trees

Roads not only in Berland

dfs and similar, dsu, graphs, trees

Scheme

dfs and similar, trees

Two Paths

dfs and similar, graphs, shortest paths, trees

Exposition

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