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Before contest
Codeforces Round 941 (Div. 1)
4 days
Before contest
Codeforces Round 941 (Div. 2)
4 days
→ Filter Problems
Difficulty:
—
dfs and similar
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Custom test
Problems
#
Name
1446E
Long Recovery
constructive algorithms
,
dfs and similar
3500
x75
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x84
1648F
Two Avenues
data structures
,
dfs and similar
,
graphs
3500
x102
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x130
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x137
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x147
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x161
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x165
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x187
1616G
Just Add an Edge
dfs and similar
,
dp
,
graphs
3500
x234
1089H
Harder Satisfiability
2-sat
,
dfs and similar
,
graphs
3400
x105
1552I
Organizing a Music Festival
dfs and similar
,
math
3400
x121
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x136
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x137
1601F
Two Sorts
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
3400
x167
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x182
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x229
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x235
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x355
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x115
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x199
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x259
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x393
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x565
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x270
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x302
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x319
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x364
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x381
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x383
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x585
538H
Summer Dichotomy
2-sat
,
data structures
,
dfs and similar
,
greedy
3200
x602
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x2112
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x169
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x217
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x325
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x394
521E
Cycling City
dfs and similar
,
graphs
3100
x914
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x1018
1236F
Alice and the Cactus
dfs and similar
,
graphs
,
math
,
probabilities
3000
x167
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x168
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x177
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x226
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x326
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x345
1178G
The Awesomest Vertex
data structures
,
dfs and similar
3000
x406
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x414
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x417
1558E
Down Below
binary search
,
dfs and similar
,
graphs
,
greedy
,
meet-in-the-middle
,
shortest paths
3000
x430
1552G
A Serious Referee
bitmasks
,
brute force
,
dfs and similar
,
sortings
3000
x446
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x446
1610F
Mashtali: a Space Oddysey
constructive algorithms
,
dfs and similar
,
graphs
3000
x491
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x509
1534F2
Falling Sand (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
3000
x511
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x551
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x577
1320E
Treeland and Viruses
data structures
,
dfs and similar
,
dp
,
shortest paths
,
trees
3000
x616
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x623
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x634
566C
Logistical Questions
dfs and similar
,
divide and conquer
,
trees
3000
x690
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x857
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x84
1218H
Function Composition
dfs and similar
2900
x108
1510C
Cactus Not Enough
dfs and similar
,
graph matchings
,
graphs
2900
x204
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x204
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x239
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x244
687E
TOF
dfs and similar
,
graphs
2900
x310
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x311
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x325
1266F
Almost Same Distance
dfs and similar
,
graphs
2900
x330
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x353
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x397
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x440
1392G
Omkar and Pies
bitmasks
,
dfs and similar
,
dp
,
math
,
shortest paths
2900
x441
1062F
Upgrading Cities
dfs and similar
,
graphs
2900
x542
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x543
1667D
Edge Elimination
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x639
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x670
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1593
741D
Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths
data structures
,
dfs and similar
,
trees
2900
x2434
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x126
869D
The Overdosing Ubiquity
brute force
,
dfs and similar
,
graphs
2800
x235
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x301
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x345
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x359
1214H
Tiles Placement
constructive algorithms
,
dfs and similar
,
trees
2800
x369
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x370
1389G
Directing Edges
dfs and similar
,
dp
,
graphs
,
trees
2800
x380
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x395
1685D1
Permutation Weight (Easy Version)
constructive algorithms
,
dfs and similar
,
dsu
2800
x418
348E
Pilgrims
dfs and similar
,
dp
,
trees
2800
x426
1749F
Distance to the Path
data structures
,
dfs and similar
,
trees
2800
x467
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x474
1477D
Nezzar and Hidden Permutations
constructive algorithms
,
dfs and similar
,
graphs
2800
x529
51F
Caterpillar
dfs and similar
,
dp
,
graphs
,
trees
2800
x545
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x576
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x578
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x694
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x710
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