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Before contest
Codeforces Round 941 (Div. 1)
20:21:48
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Before contest
Codeforces Round 941 (Div. 2)
20:21:48
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→ Filter Problems
Difficulty:
—
implementation
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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Problems
#
Name
959E
Mahmoud and Ehab and the xor-MST
bitmasks
,
dp
,
graphs
,
implementation
,
math
1900
x3301
959B
Mahmoud and Ehab and the message
dsu
,
greedy
,
implementation
1200
x9073
958F1
Lightsabers (easy)
implementation
1500
x1580
958B1
Maximum Control (easy)
implementation
1000
x3306
958A1
Death Stars (easy)
implementation
1400
x1634
957A
Tritonic Iridescence
implementation
1300
x5657
955B
Not simply beatiful strings
implementation
1400
x4731
954C
Matrix Walk
implementation
1700
x3685
954B
String Typing
implementation
,
strings
1400
x7092
954A
Diagonal Walking
implementation
800
x10368
952C
Ravioli Sort
implementation
1600
x2832
950B
Intercepted Message
greedy
,
implementation
1100
x7294
950A
Left-handers, Right-handers and Ambidexters
implementation
,
math
800
x14876
948A
Protect Sheep
brute force
,
dfs and similar
,
graphs
,
implementation
900
x13349
946E
Largest Beautiful Number
greedy
,
implementation
2200
x1071
940D
Alena And The Heater
binary search
,
implementation
1600
x3562
940C
Phone Numbers
constructive algorithms
,
implementation
,
strings
1500
x5601
939B
Hamster Farm
implementation
1000
x10210
938A
Word Correction
implementation
800
x11020
937A
Olympiad
implementation
,
sortings
800
x14814
936C
Lock Puzzle
constructive algorithms
,
implementation
,
strings
2300
x1149
936A
Save Energy!
binary search
,
implementation
,
math
1700
x4313
935B
Fafa and the Gates
implementation
900
x11341
935A
Fafa and his Company
brute force
,
implementation
800
x41429
934B
A Prosperous Lot
constructive algorithms
,
implementation
1200
x8515
931C
Laboratory Work
implementation
,
math
1700
x3289
931B
World Cup
constructive algorithms
,
implementation
1200
x7020
931A
Friends Meeting
brute force
,
greedy
,
implementation
,
math
800
x11681
930D
Game with Tokens
data structures
,
games
,
implementation
2500
x393
930B
Game with String
implementation
,
probabilities
,
strings
1600
x2587
929B
Места в самолёте
*special problem
,
implementation
1300
x2037
929A
Прокат велосипедов
*special problem
,
greedy
,
implementation
1400
x2491
928C
Dependency management
*special problem
,
graphs
,
implementation
1900
x879
926C
Is This a Zebra?
implementation
1700
x1827
926A
2-3-numbers
implementation
,
math
1300
x3669
925B
Resource Distribution
binary search
,
implementation
,
sortings
1700
x2174
924A
Mystical Mosaic
greedy
,
implementation
1300
x4904
923D
Picking Strings
constructive algorithms
,
implementation
,
strings
2500
x1154
922A
Cloning Toys
implementation
1300
x11267
920D
Tanks
dp
,
greedy
,
implementation
2400
x683
920B
Tea Queue
implementation
1200
x7069
920A
Water The Garden
implementation
1000
x7586
919C
Seat Arrangements
brute force
,
implementation
1300
x8812
919B
Perfect Number
binary search
,
brute force
,
dp
,
implementation
,
number theory
1100
x26718
919A
Supermarket
brute force
,
greedy
,
implementation
800
x15876
918B
Radio Station
implementation
,
strings
900
x15623
918A
Eleven
brute force
,
implementation
800
x16728
917A
The Monster
dp
,
greedy
,
implementation
,
math
1800
x3421
916A
Jamie and Alarm Snooze
brute force
,
implementation
,
math
900
x8471
915E
Physical Education Lessons
data structures
,
implementation
,
sortings
2300
x3986
915B
Browser
implementation
1300
x7635
915A
Garden
implementation
900
x14340
914B
Conan and Agasa play a Card Game
games
,
greedy
,
implementation
1200
x8492
914A
Perfect Squares
brute force
,
implementation
,
math
900
x13731
913B
Christmas Spruce
implementation
,
trees
1200
x15358
913A
Modular Exponentiation
implementation
,
math
900
x20536
912A
Tricky Alchemy
implementation
800
x13300
911E
Stack Sorting
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x2460
911B
Two Cakes
binary search
,
brute force
,
implementation
1200
x10859
911A
Nearest Minimums
implementation
1100
x11280
910B
Door Frames
greedy
,
implementation
1600
x1672
910A
The Way to Home
dfs and similar
,
dp
,
greedy
,
implementation
800
x11355
909D
Colorful Points
data structures
,
greedy
,
implementation
2100
x1672
908F
New Year and Rainbow Roads
graphs
,
greedy
,
implementation
2400
x1369
908C
New Year and Curling
brute force
,
geometry
,
implementation
,
math
1500
x6661
908B
New Year and Buggy Bot
brute force
,
implementation
1200
x7569
908A
New Year and Counting Cards
brute force
,
implementation
800
x14599
907B
Tic-Tac-Toe
implementation
1400
x4006
907A
Masha and Bears
brute force
,
implementation
1300
x5552
906A
Shockers
implementation
,
strings
1600
x4088
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1252
903B
The Modcrab
greedy
,
implementation
1200
x7572
903A
Hungry Student Problem
greedy
,
implementation
900
x14358
902A
Visiting a Friend
greedy
,
implementation
1100
x9677
900A
Find Extra One
geometry
,
implementation
800
x13347
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x2732
899B
Months and Years
implementation
1200
x5746
898C
Phone Numbers
implementation
,
strings
1400
x5127
898B
Proper Nutrition
brute force
,
implementation
,
number theory
1100
x9250
898A
Rounding
implementation
,
math
800
x15584
897A
Scarborough Fair
implementation
800
x13915
895A
Pizza Separation
brute force
,
implementation
1200
x6448
893D
Credit Card
data structures
,
dp
,
greedy
,
implementation
1900
x2914
893B
Beautiful Divisors
brute force
,
implementation
1000
x10928
893A
Chess For Three
implementation
900
x10009
892B
Wrath
greedy
,
implementation
,
two pointers
1200
x8655
892A
Greed
greedy
,
implementation
900
x13191
888C
K-Dominant Character
binary search
,
implementation
,
two pointers
1400
x8052
888A
Local Extrema
brute force
,
implementation
800
x10653
887C
Solution for Cube
brute force
,
implementation
1500
x2833
887B
Cubes for Masha
brute force
,
implementation
1300
x5527
887A
Div. 64
implementation
1000
x10926
886D
Restoration of string
constructive algorithms
,
graphs
,
implementation
2000
x1719
886C
Petya and Catacombs
dsu
,
greedy
,
implementation
,
trees
1300
x5425
884B
Japanese Crosswords Strike Back
implementation
1100
x6793
884A
Book Reading
implementation
800
x10330
883K
Road Widening
constructive algorithms
,
greedy
,
implementation
1800
x1070
883H
Palindromic Cut
brute force
,
implementation
,
strings
1800
x1564
883F
Lost in Transliteration
implementation
1300
x2232
883E
Field of Wonders
implementation
,
strings
1500
x1876
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