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Problems
#
Name
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x309
869D
The Overdosing Ubiquity
brute force
,
dfs and similar
,
graphs
2800
x235
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x127
741D
Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths
data structures
,
dfs and similar
,
trees
2900
x2458
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1620
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x688
1667D
Edge Elimination
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x642
1062F
Upgrading Cities
dfs and similar
,
graphs
2900
x559
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x546
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x449
1392G
Omkar and Pies
bitmasks
,
dfs and similar
,
dp
,
math
,
shortest paths
2900
x442
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x409
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x357
1266F
Almost Same Distance
dfs and similar
,
graphs
2900
x331
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x330
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x311
687E
TOF
dfs and similar
,
graphs
2900
x310
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x245
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x241
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x206
1510C
Cactus Not Enough
dfs and similar
,
graph matchings
,
graphs
2900
x205
1218H
Function Composition
dfs and similar
2900
x109
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x84
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x872
566C
Logistical Questions
dfs and similar
,
divide and conquer
,
trees
3000
x695
1320E
Treeland and Viruses
data structures
,
dfs and similar
,
dp
,
shortest paths
,
trees
3000
x667
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x645
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x627
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x585
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x555
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x524
1534F2
Falling Sand (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
3000
x516
1610F
Mashtali: a Space Oddysey
constructive algorithms
,
dfs and similar
,
graphs
3000
x501
1552G
A Serious Referee
bitmasks
,
brute force
,
dfs and similar
,
sortings
3000
x454
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x447
1558E
Down Below
binary search
,
dfs and similar
,
graphs
,
greedy
,
meet-in-the-middle
,
shortest paths
3000
x435
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x419
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x419
1178G
The Awesomest Vertex
data structures
,
dfs and similar
3000
x411
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x373
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x329
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x228
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x182
1236F
Alice and the Cactus
dfs and similar
,
graphs
,
math
,
probabilities
3000
x168
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x168
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x1029
521E
Cycling City
dfs and similar
,
graphs
3100
x918
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x422
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x327
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x217
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x169
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x2145
538H
Summer Dichotomy
2-sat
,
data structures
,
dfs and similar
,
greedy
3200
x628
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x586
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x388
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x384
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x371
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x321
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x305
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x271
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x568
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x394
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x260
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x199
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x124
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x84
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x363
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x235
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x233
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x182
1601F
Two Sorts
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
3400
x167
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x137
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x136
1552I
Organizing a Music Festival
dfs and similar
,
math
3400
x121
1089H
Harder Satisfiability
2-sat
,
dfs and similar
,
graphs
3400
x106
1616G
Just Add an Edge
dfs and similar
,
dp
,
graphs
3500
x265
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x187
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x179
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x162
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x150
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x144
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x132
1648F
Two Avenues
data structures
,
dfs and similar
,
graphs
3500
x103
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x88
1446E
Long Recovery
constructive algorithms
,
dfs and similar
3500
x76
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