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Before contest
Codeforces Round 941 (Div. 1)
37:41:31
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Before contest
Codeforces Round 941 (Div. 2)
37:41:31
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Difficulty:
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greedy
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
1580A
Portal
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x3541
231B
Magic, Wizardry and Wonders
constructive algorithms
,
greedy
1500
x3553
1060D
Social Circles
greedy
,
math
1900
x3557
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x3558
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3569
1070F
Debate
greedy
1500
x3569
1470D
Strange Housing
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
2200
x3574
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3576
1260D
A Game with Traps
binary search
,
dp
,
greedy
,
sortings
1900
x3580
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3588
1157D
N Problems During K Days
constructive algorithms
,
greedy
,
math
1900
x3602
898D
Alarm Clock
greedy
1600
x3607
729D
Sea Battle
constructive algorithms
,
greedy
,
math
1700
x3608
1680E
Moving Chips
bitmasks
,
dp
,
greedy
2000
x3621
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3629
1333D
Challenges in school №41
brute force
,
constructive algorithms
,
games
,
graphs
,
greedy
,
implementation
,
sortings
2100
x3630
988E
Divisibility by 25
brute force
,
greedy
2100
x3634
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3636
1299C
Water Balance
data structures
,
geometry
,
greedy
2100
x3636
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3643
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3645
1136D
Nastya Is Buying Lunch
greedy
1800
x3664
612D
The Union of k-Segments
greedy
,
sortings
1800
x3664
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3666
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x3674
924C
Riverside Curio
data structures
,
dp
,
greedy
1700
x3675
555B
Case of Fugitive
data structures
,
greedy
,
sortings
2000
x3680
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3684
101A
Homework
greedy
1200
x3686
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3691
535C
Tavas and Karafs
binary search
,
greedy
,
math
1900
x3702
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3712
980C
Posterized
games
,
greedy
1700
x3720
1141F1
Same Sum Blocks (Easy)
greedy
1900
x3728
363D
Renting Bikes
binary search
,
greedy
1800
x3739
1904D2
Set To Max (Hard Version)
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
sortings
1800
x3748
1129A1
Toy Train (Simplified)
brute force
,
greedy
1700
x3760
1626D
Martial Arts Tournament
binary search
,
brute force
,
greedy
,
math
2100
x3780
468B
Two Sets
2-sat
,
dfs and similar
,
dsu
,
graph matchings
,
greedy
2000
x3781
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3792
960C
Subsequence Counting
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1700
x3807
1384B1
Koa and the Beach (Easy Version)
brute force
,
dp
,
greedy
1900
x3833
729C
Road to Cinema
binary search
,
greedy
,
sortings
1700
x3835
33A
What is for dinner?
greedy
,
implementation
1200
x3840
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x3854
777E
Hanoi Factory
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x3855
527B
Error Correct System
greedy
1500
x3855
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3859
449A
Jzzhu and Chocolate
greedy
,
math
1700
x3865
1474D
Cleaning
data structures
,
dp
,
greedy
,
math
2200
x3866
1256E
Yet Another Division Into Teams
dp
,
greedy
,
sortings
2000
x3867
358D
Dima and Hares
dp
,
greedy
1800
x3867
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x3871
1468J
Road Reform
dsu
,
graphs
,
greedy
1800
x3879
1129A2
Toy Train
brute force
,
greedy
1800
x3892
1479B2
Painting the Array II
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2100
x3893
1842D
Tenzing and His Animal Friends
constructive algorithms
,
graphs
,
greedy
1900
x3905
1333F
Kate and imperfection
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2200
x3906
558C
Amr and Chemistry
brute force
,
graphs
,
greedy
,
math
,
shortest paths
1900
x3914
333A
Secrets
greedy
1600
x3922
1223D
Sequence Sorting
dp
,
greedy
,
two pointers
2000
x3923
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x3930
827A
String Reconstruction
data structures
,
greedy
,
sortings
,
strings
1700
x3936
557C
Arthur and Table
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
1900
x3937
1909D
Split Plus K
greedy
,
math
,
number theory
1900
x3939
761D
Dasha and Very Difficult Problem
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
1700
x3940
1872G
Replace With Product
brute force
,
greedy
,
math
2000
x3943
767C
Garland
dfs and similar
,
graphs
,
greedy
,
trees
2000
x3954
1621D
The Winter Hike
constructive algorithms
,
greedy
,
math
2100
x3955
1733D2
Zero-One (Hard Version)
dp
,
greedy
2000
x3964
724B
Batch Sort
brute force
,
greedy
,
implementation
,
math
1500
x3967
79A
Bus Game
greedy
1200
x3972
250A
Paper Work
greedy
1000
x3975
154A
Hometask
greedy
1600
x3978
342B
Xenia and Spies
brute force
,
greedy
,
implementation
1500
x3983
1082E
Increasing Frequency
binary search
,
dp
,
greedy
2000
x3996
1716C
Robot in a Hallway
data structures
,
dp
,
greedy
,
implementation
,
ternary search
2000
x4000
1650E
Rescheduling the Exam
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1900
x4001
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x4008
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x4010
1250L
Divide The Students
binary search
,
greedy
,
math
1500
x4015
774C
Maximum Number
*special problem
,
constructive algorithms
,
greedy
,
implementation
1200
x4018
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x4019
1620D
Exact Change
brute force
,
constructive algorithms
,
greedy
2000
x4020
1389D
Segment Intersections
brute force
,
greedy
,
implementation
,
math
2100
x4021
1090A
Company Merging
greedy
1300
x4026
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x4029
1421D
Hexagons
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
1900
x4046
1141F2
Same Sum Blocks (Hard)
data structures
,
greedy
1900
x4048
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x4050
270B
Multithreading
data structures
,
greedy
,
implementation
1400
x4071
1453D
Checkpoints
brute force
,
constructive algorithms
,
greedy
,
math
,
probabilities
1900
x4072
1514D
Cut and Stick
binary search
,
data structures
,
greedy
,
implementation
,
sortings
2000
x4080
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4090
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4093
31B
Sysadmin Bob
greedy
,
implementation
,
strings
1500
x4096
1282C
Petya and Exam
greedy
,
sortings
,
two pointers
1800
x4097
671A
Recycling Bottles
dp
,
geometry
,
greedy
,
implementation
1800
x4104
1178E
Archaeology
brute force
,
constructive algorithms
,
greedy
,
strings
1900
x4113
1257E
The Contest
data structures
,
dp
,
greedy
2000
x4114
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