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Before contest
Codeforces Round 941 (Div. 1)
46:57:58
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Before contest
Codeforces Round 941 (Div. 2)
46:57:57
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brute force
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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Name
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1968
1051C
Vasya and Multisets
brute force
,
dp
,
greedy
,
implementation
,
math
1500
x9127
1043D
Mysterious Crime
brute force
,
combinatorics
,
math
,
meet-in-the-middle
,
two pointers
1700
x4366
1042B
Vitamins
bitmasks
,
brute force
,
dp
,
implementation
1200
x15095
1038E
Maximum Matching
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x951
1036G
Sources and Sinks
bitmasks
,
brute force
,
dfs and similar
2700
x361
1034B
Little C Loves 3 II
brute force
,
constructive algorithms
,
flows
,
graph matchings
2200
x2071
1033F
Boolean Computer
bitmasks
,
brute force
,
fft
,
math
2800
x364
1033C
Permutation Game
brute force
,
dp
,
games
1600
x5367
1031F
Familiar Operations
brute force
,
graphs
,
math
2800
x264
1029F
Multicolored Markers
binary search
,
brute force
,
math
,
number theory
2000
x2466
1028F
Make Symmetrical
brute force
2900
x510
1025D
Recovering BST
brute force
,
dp
,
math
,
number theory
,
trees
2100
x3294
1025B
Weakened Common Divisor
brute force
,
greedy
,
number theory
1600
x7748
1023A
Single Wildcard Pattern Matching
brute force
,
implementation
,
strings
1200
x8503
1020B
Badge
brute force
,
dfs and similar
,
graphs
1000
x20136
1019A
Elections
brute force
,
greedy
1700
x4509
1017H
The Films
brute force
3300
x137
1017F
The Neutral Zone
brute force
,
math
2500
x795
1017D
The Wu
bitmasks
,
brute force
,
data structures
1900
x3329
1016B
Segment Occurrences
brute force
,
implementation
1300
x9222
1015E1
Stars Drawing (Easy Edition)
brute force
,
dp
,
greedy
1700
x5443
1012A
Photo of The Sky
brute force
,
implementation
,
math
,
sortings
1500
x6147
1011B
Planning The Expedition
binary search
,
brute force
,
implementation
1200
x9794
1009D
Relatively Prime Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
math
1700
x6137
1007B
Pave the Parallelepiped
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2400
x921
1006F
Xor-Paths
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2100
x4622
1005F
Berland and the Shortest Paths
brute force
,
dfs and similar
,
graphs
,
shortest paths
2100
x1605
1005C
Summarize to the Power of Two
brute force
,
greedy
,
implementation
1300
x11289
1005B
Delete from the Left
brute force
,
implementation
,
strings
900
x22246
1004D
Sonya and Matrix
brute force
,
constructive algorithms
,
implementation
2300
x1389
1003C
Intense Heat
brute force
,
implementation
,
math
1300
x10297
999A
Mishka and Contest
brute force
,
implementation
800
x22177
997B
Roman Digits
brute force
,
combinatorics
,
dp
,
greedy
,
math
2000
x2856
997A
Convert to Ones
brute force
,
greedy
,
implementation
,
math
1500
x8152
995C
Leaving the Bar
brute force
,
data structures
,
geometry
,
greedy
,
math
,
sortings
2300
x1725
993C
Careful Maneuvering
bitmasks
,
brute force
,
geometry
2100
x1478
993B
Open Communication
bitmasks
,
brute force
1900
x1928
992D
Nastya and a Game
brute force
,
implementation
,
math
2100
x1583
991F
Concise and clear
brute force
,
greedy
,
implementation
,
math
2700
x294
991E
Bus Number
brute force
,
combinatorics
,
math
1800
x3400
990E
Post Lamps
brute force
,
greedy
2100
x1973
988E
Divisibility by 25
brute force
,
greedy
2100
x3634
988D
Points and Powers of Two
brute force
,
math
1800
x6772
988A
Diverse Team
brute force
,
implementation
800
x23746
987C
Three displays
brute force
,
dp
,
implementation
1400
x13062
986E
Prince's Problem
brute force
,
data structures
,
math
,
number theory
,
trees
2800
x698
982D
Shark
brute force
,
data structures
,
dsu
,
trees
1900
x2242
982A
Row
brute force
,
constructive algorithms
1200
x8933
981A
Antipalindrome
brute force
,
implementation
,
strings
900
x9021
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1681
978D
Almost Arithmetic Progression
brute force
,
implementation
,
math
1500
x8343
975B
Mancala
brute force
,
implementation
1100
x6733
963C
Cutting Rectangle
brute force
,
math
,
number theory
2600
x558
962C
Make a Square
brute force
,
implementation
,
math
1400
x7742
961C
Chessboard
bitmasks
,
brute force
,
implementation
1400
x5214
960D
Full Binary Tree Queries
brute force
,
implementation
,
trees
2100
x1676
958E1
Guard Duty (easy)
brute force
,
geometry
,
greedy
,
math
1600
x1467
958C1
Encryption (easy)
brute force
1200
x2769
955D
Scissors
brute force
,
strings
2600
x453
952B
A Map of the Cat
brute force
,
interactive
1900
x1990
949E
Binary Cards
brute force
2700
x595
949D
Curfew
binary search
,
brute force
,
greedy
,
sortings
2300
x811
948A
Protect Sheep
brute force
,
dfs and similar
,
graphs
,
implementation
900
x13345
940F
Machine Learning
brute force
,
data structures
2600
x2408
940A
Points on the line
brute force
,
greedy
,
sortings
1200
x8131
938C
Constructing Tests
binary search
,
brute force
,
constructive algorithms
1700
x3273
938B
Run For Your Prize
brute force
,
greedy
1100
x8732
937B
Vile Grasshoppers
brute force
,
math
,
number theory
1400
x6784
935A
Fafa and his Company
brute force
,
implementation
800
x41420
934A
A Compatible Pair
brute force
,
games
1400
x6698
933D
A Creative Cutout
brute force
,
combinatorics
,
math
2900
x280
932C
Permutation Cycle
brute force
,
constructive algorithms
1600
x3964
931A
Friends Meeting
brute force
,
greedy
,
implementation
,
math
800
x11679
922C
Cave Painting
brute force
,
number theory
1600
x6832
922B
Magic Forest
brute force
1300
x8278
920G
List Of Integers
binary search
,
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2200
x1670
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6191
919C
Seat Arrangements
brute force
,
implementation
1300
x8810
919B
Perfect Number
binary search
,
brute force
,
dp
,
implementation
,
number theory
1100
x26694
919A
Supermarket
brute force
,
greedy
,
implementation
800
x15874
918A
Eleven
brute force
,
implementation
800
x16725
916A
Jamie and Alarm Snooze
brute force
,
implementation
,
math
900
x8471
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1416
914C
Travelling Salesman and Special Numbers
brute force
,
combinatorics
,
dp
1800
x3588
914A
Perfect Squares
brute force
,
implementation
,
math
900
x13728
913D
Too Easy Problems
binary search
,
brute force
,
data structures
,
greedy
,
sortings
1800
x4492
912C
Perun, Ult!
brute force
,
greedy
,
sortings
2500
x506
911D
Inversion Counting
brute force
,
math
1800
x4414
911C
Three Garlands
brute force
,
constructive algorithms
1400
x6951
911B
Two Cakes
binary search
,
brute force
,
implementation
1200
x10849
909A
Generate Login
brute force
,
greedy
,
sortings
1000
x9129
908C
New Year and Curling
brute force
,
geometry
,
implementation
,
math
1500
x6659
908B
New Year and Buggy Bot
brute force
,
implementation
1200
x7569
908A
New Year and Counting Cards
brute force
,
implementation
800
x14599
907A
Masha and Bears
brute force
,
implementation
1300
x5552
906C
Party
bitmasks
,
brute force
,
dp
,
graphs
2400
x1179
906B
Seating of Students
brute force
,
constructive algorithms
,
math
2200
x1121
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1252
900C
Remove Extra One
brute force
,
data structures
,
math
1700
x4408
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