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Before contest
Codeforces Round 941 (Div. 1)
2 days
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Before contest
Codeforces Round 941 (Div. 2)
2 days
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divide and conquer
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
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Problems
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Name
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x32
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x64
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x67
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x69
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x77
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x93
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x104
1842I
Tenzing and Necklace
divide and conquer
,
dp
,
greedy
3500
x107
1470F
Strange Covering
divide and conquer
3500
x113
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x122
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x130
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x132
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x133
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x147
1770G
Koxia and Bracket
divide and conquer
,
fft
,
math
3400
x147
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x167
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x168
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x182
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x184
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x189
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x194
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x195
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x200
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x202
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x215
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
x231
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x235
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x249
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x252
1906K
Deck-Building Game
divide and conquer
,
math
2500
x261
1425B
Blue and Red of Our Faculty!
divide and conquer
,
dp
2600
x273
232C
Doe Graphs
constructive algorithms
,
divide and conquer
,
dp
,
graphs
,
shortest paths
2600
x279
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x306
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x307
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x307
217C
Formurosa
divide and conquer
,
dp
,
expression parsing
2600
x311
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x312
1218D
Xor Spanning Tree
divide and conquer
,
fft
,
graphs
2400
x312
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x312
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x326
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x327
117D
Not Quick Transformation
divide and conquer
,
math
2500
x330
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x335
1250M
SmartGarden
constructive algorithms
,
divide and conquer
2500
x350
1218E
Product Tuples
divide and conquer
,
fft
2500
x355
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x356
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x364
1139F
Dish Shopping
data structures
,
divide and conquer
2500
x365
1261F
Xor-Set
bitmasks
,
divide and conquer
,
math
3100
x370
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x371
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x371
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x372
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x378
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x382
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x387
1543E
The Final Pursuit
bitmasks
,
constructive algorithms
,
divide and conquer
,
graphs
,
greedy
,
math
2700
x393
1375H
Set Merging
constructive algorithms
,
divide and conquer
3300
x394
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x395
1523G
Try Booking
data structures
,
divide and conquer
3200
x401
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x405
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x412
1372F
Omkar and Modes
binary search
,
divide and conquer
,
interactive
2700
x422
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x424
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x427
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x428
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x432
1905F
Field Should Not Be Empty
brute force
,
data structures
,
divide and conquer
2600
x442
573D
Bear and Cavalry
data structures
,
divide and conquer
,
dp
3000
x445
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x446
1181E1
A Story of One Country (Easy)
brute force
,
divide and conquer
,
sortings
2500
x448
1140G
Double Tree
data structures
,
divide and conquer
,
shortest paths
,
trees
2700
x449
1814F
Communication Towers
brute force
,
divide and conquer
,
dsu
2700
x451
1379F2
Chess Strikes Back (hard version)
data structures
,
divide and conquer
2800
x462
763E
Timofey and our friends animals
data structures
,
divide and conquer
,
dsu
2900
x475
101E
Candies and Stones
divide and conquer
,
dp
2500
x477
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x478
1268D
Invertation in Tournament
brute force
,
divide and conquer
,
graphs
,
math
3200
x480
512E
Fox And Polygon
constructive algorithms
,
divide and conquer
2900
x500
1371F
Raging Thunder
data structures
,
divide and conquer
,
implementation
2800
x501
685E
Travelling Through the Snow Queen's Kingdom
bitmasks
,
brute force
,
divide and conquer
,
graphs
2800
x502
793F
Julia the snail
data structures
,
divide and conquer
,
dp
3000
x505
1423H
Virus
data structures
,
divide and conquer
,
dsu
,
graphs
2500
x506
1316F
Battalion Strength
data structures
,
divide and conquer
,
probabilities
2800
x509
480E
Parking Lot
data structures
,
divide and conquer
2800
x512
364E
Empty Rectangles
divide and conquer
,
two pointers
3000
x533
1217F
Forced Online Queries Problem
data structures
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x538
1186E
Vus the Cossack and a Field
divide and conquer
,
implementation
,
math
2500
x555
1257G
Divisor Set
divide and conquer
,
fft
,
greedy
,
math
,
number theory
2600
x572
1730E
Maximums and Minimums
combinatorics
,
data structures
,
divide and conquer
,
number theory
2700
x609
1603D
Artistic Partition
divide and conquer
,
dp
,
number theory
3000
x609
995E
Number Clicker
divide and conquer
,
graphs
,
meet-in-the-middle
,
number theory
2700
x612
1680F
Lenient Vertex Cover
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x626
1550F
Jumping Around
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
graphs
,
shortest paths
2700
x627
1849F
XOR Partition
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
trees
2700
x628
161C
Abracadabra
divide and conquer
2400
x638
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x641
1874D
Jellyfish and Miku
divide and conquer
,
dp
,
math
,
probabilities
2800
x643
413E
Maze 2D
data structures
,
divide and conquer
2200
x663
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x665
1553H
XOR and Distance
bitmasks
,
divide and conquer
,
trees
2900
x669
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