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Before contest
Codeforces Round 941 (Div. 1)
24:46:24
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
24:46:26
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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
834B
The Festive Evening
data structures
,
implementation
1100
x8506
834A
The Useless Toy
implementation
900
x8487
833E
Caramel Clouds
data structures
,
dp
,
sortings
3400
x210
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x371
833C
Ever-Hungry Krakozyabra
brute force
,
combinatorics
,
greedy
,
math
2700
x460
833B
The Bakery
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2200
x4477
833A
The Meaningless Game
math
,
number theory
1700
x6014
832E
Vasya and Shifts
matrices
2600
x277
832D
Misha, Grisha and Underground
dfs and similar
,
graphs
,
trees
1900
x3596
832C
Strange Radiation
binary search
,
implementation
,
math
2500
x427
832B
Petya and Exam
implementation
,
strings
1600
x4326
832A
Sasha and Sticks
games
,
math
800
x20317
831C
Jury Marks
brute force
,
constructive algorithms
1700
x4365
831B
Keyboard Layouts
implementation
,
strings
800
x14049
831A
Unimodal Array
implementation
1000
x10021
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x272
830D
Singer House
combinatorics
,
dp
,
graphs
,
trees
2800
x796
830C
Bamboo Partition
brute force
,
data structures
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2300
x1181
830B
Cards Sorting
data structures
,
implementation
,
sortings
1600
x2787
830A
Office Keys
binary search
,
brute force
,
dp
,
greedy
,
sortings
1800
x6542
828B
Black Square
implementation
1300
x5650
828A
Restaurant Tables
implementation
1200
x7787
827F
Dirty Arkady's Kitchen
data structures
,
dp
,
graphs
,
shortest paths
3200
x383
827E
Rusty String
fft
,
math
,
strings
2700
x788
827D
Best Edge Weight
data structures
,
dfs and similar
,
graphs
,
trees
2700
x1056
827C
DNA Evolution
data structures
,
strings
2100
x1611
827B
High Load
constructive algorithms
,
greedy
,
implementation
,
trees
1800
x3435
827A
String Reconstruction
data structures
,
greedy
,
sortings
,
strings
1700
x3936
825G
Tree Queries
dfs and similar
,
graphs
,
trees
2500
x1140
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1319
825E
Minimal Labels
data structures
,
dfs and similar
,
graphs
,
greedy
2300
x2987
825D
Suitable Replacement
binary search
,
greedy
,
implementation
1500
x3173
825C
Multi-judge Solving
greedy
,
implementation
1600
x4349
825B
Five-In-a-Row
brute force
,
implementation
1600
x4049
825A
Binary Protocol
implementation
1100
x7525
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2500
x288
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x751
822D
My pretty girl Noora
brute force
,
dp
,
greedy
,
math
,
number theory
1800
x2951
822C
Hacker, pack your bags!
binary search
,
greedy
,
implementation
,
sortings
1600
x4523
822B
Crossword solving
brute force
,
implementation
,
strings
1000
x9314
822A
I'm bored with life
implementation
,
math
,
number theory
800
x31608
821E
Okabe and El Psy Kongroo
dp
,
matrices
2100
x1410
821D
Okabe and City
dfs and similar
,
graphs
,
shortest paths
2200
x1339
821C
Okabe and Boxes
data structures
,
greedy
,
trees
1500
x6571
821B
Okabe and Banana Trees
brute force
,
math
1300
x5623
821A
Okabe and Future Gadget Laboratory
implementation
800
x7936
820B
Mister B and Angle in Polygon
constructive algorithms
,
geometry
,
math
1300
x5079
820A
Mister B and Book Reading
implementation
900
x8020
819E
Mister B and Flight to the Moon
constructive algorithms
,
graphs
2800
x497
819D
Mister B and Astronomers
number theory
2900
x214
819C
Mister B and Beacons on Field
number theory
2900
x204
819B
Mister B and PR Shifts
data structures
,
implementation
,
math
1900
x1620
819A
Mister B and Boring Game
games
,
greedy
2200
x292
818G
Four Melodies
flows
,
graphs
2600
x624
818F
Level Generation
binary search
,
math
,
ternary search
2100
x1283
818E
Card Game Again
binary search
,
data structures
,
number theory
,
two pointers
1900
x1871
818D
Multicolored Cars
data structures
,
implementation
1700
x3381
818C
Sofa Thief
brute force
,
implementation
2000
x1212
818B
Permutation Game
implementation
1600
x2956
818A
Diplomas and Certificates
implementation
,
math
800
x6772
817F
MEX Queries
binary search
,
data structures
,
trees
2300
x2391
817E
Choosing The Commander
bitmasks
,
data structures
,
trees
2000
x2681
817D
Imbalanced Array
data structures
,
divide and conquer
,
dsu
,
sortings
1900
x4382
817C
Really Big Numbers
binary search
,
brute force
,
dp
,
math
1600
x7009
817B
Makes And The Product
combinatorics
,
implementation
,
math
,
sortings
1500
x5543
817A
Treasure Hunt
implementation
,
math
,
number theory
1200
x6056
816B
Karen and Coffee
binary search
,
data structures
,
implementation
1400
x16350
816A
Karen and Morning
brute force
,
implementation
1000
x8883
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x218
815D
Karen and Cards
binary search
,
combinatorics
,
data structures
,
geometry
2800
x594
815C
Karen and Supermarket
brute force
,
dp
,
trees
2400
x2461
815B
Karen and Test
brute force
,
combinatorics
,
constructive algorithms
,
math
2200
x1361
815A
Karen and Game
brute force
,
greedy
,
implementation
1700
x5571
814E
An unavoidable detour for home
combinatorics
,
dp
,
graphs
,
shortest paths
2600
x637
814D
An overnight dance in discotheque
dfs and similar
,
dp
,
geometry
,
greedy
,
trees
2000
x2124
814C
An impassioned circulation of affection
brute force
,
dp
,
strings
,
two pointers
1600
x6292
814B
An express train to reveries
constructive algorithms
1300
x5544
814A
An abandoned sentiment from past
constructive algorithms
,
greedy
,
implementation
,
sortings
900
x10238
813F
Bipartite Checking
data structures
,
dsu
,
graphs
2500
x1210
813E
Army Creation
binary search
,
data structures
2200
x2266
813D
Two Melodies
dp
,
flows
2600
x964
813C
The Tag Game
dfs and similar
,
graphs
1700
x5651
813B
The Golden Age
brute force
,
math
1800
x3771
813A
The Contest
implementation
1100
x5007
812E
Sagheer and Apple Tree
games
,
trees
2300
x1014
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x326
812C
Sagheer and Nubian Market
binary search
,
sortings
1500
x13075
812B
Sagheer, the Hausmeister
bitmasks
,
brute force
,
dp
1600
x5068
812A
Sagheer and Crossroads
implementation
1200
x6160
811E
Vladik and Entertaining Flags
data structures
,
dsu
,
graphs
2600
x835
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1524
811C
Vladik and Memorable Trip
dp
,
implementation
1900
x3202
811B
Vladik and Complicated Book
implementation
,
sortings
1200
x6436
811A
Vladik and Courtesy
brute force
,
implementation
800
x11686
810B
Summer sell-off
greedy
,
sortings
1300
x10858
810A
Straight <<A>>
implementation
,
math
900
x8700
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x714
809D
Hitchhiking in the Baltic States
data structures
,
dp
2900
x755
809C
Find a car
combinatorics
,
divide and conquer
,
dp
2600
x725
809B
Glad to see you!
binary search
,
interactive
2200
x1436
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