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Contest is running
Codeforces Round 937 (Div. 4)
01:38:26
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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
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Custom test
Problems
#
Name
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1576
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x745
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x665
1553H
XOR and Distance
bitmasks
,
divide and conquer
,
trees
2900
x660
512E
Fox And Polygon
constructive algorithms
,
divide and conquer
2900
x498
763E
Timofey and our friends animals
data structures
,
divide and conquer
,
dsu
2900
x471
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x422
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x369
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x303
526F
Pudding Monsters
data structures
,
divide and conquer
3000
x2238
603E
Pastoral Oddities
data structures
,
divide and conquer
,
dsu
,
math
,
trees
3000
x1143
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x770
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x749
566C
Logistical Questions
dfs and similar
,
divide and conquer
,
trees
3000
x687
232E
Quick Tortoise
bitmasks
,
divide and conquer
,
dp
3000
x660
1603D
Artistic Partition
divide and conquer
,
dp
,
number theory
3000
x598
364E
Empty Rectangles
divide and conquer
,
two pointers
3000
x516
793F
Julia the snail
data structures
,
divide and conquer
,
dp
3000
x498
573D
Bear and Cavalry
data structures
,
divide and conquer
,
dp
3000
x441
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x423
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x410
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x355
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x321
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x304
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x252
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x188
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x63
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1746
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x706
1261F
Xor-Set
bitmasks
,
divide and conquer
,
math
3100
x367
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x366
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x832
1268D
Invertation in Tournament
brute force
,
divide and conquer
,
graphs
,
math
3200
x478
1523G
Try Booking
data structures
,
divide and conquer
3200
x397
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x379
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x355
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x315
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x165
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x121
1375H
Set Merging
constructive algorithms
,
divide and conquer
3300
x382
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x306
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x199
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x66
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x469
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x333
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x304
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x241
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x228
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x197
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x185
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x177
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x177
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x145
1770G
Koxia and Bracket
divide and conquer
,
fft
,
math
3400
x141
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x78
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x74
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x212
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x187
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x143
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x126
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x124
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x121
1470F
Strange Covering
divide and conquer
3500
x110
1842I
Tenzing and Necklace
divide and conquer
,
dp
,
greedy
3500
x102
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x98
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x68
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