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Before contest
Codeforces Round 941 (Div. 1)
27:25:23
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Before contest
Codeforces Round 941 (Div. 2)
27:25:23
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2-sat
binary search
bitmasks
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combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
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dsu
expression parsing
fft
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geometry
graph matchings
graphs
greedy
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interactive
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Problems
#
Name
1370E
Binary Subsequence Rotation
binary search
,
constructive algorithms
,
data structures
,
greedy
2100
x4607
364A
Matrix
combinatorics
,
data structures
,
implementation
1600
x4590
1536D
Omkar and Medians
data structures
,
greedy
,
implementation
2000
x4551
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x4536
597C
Subsequences
data structures
,
dp
1900
x4509
1661D
Progressions Covering
data structures
,
greedy
1900
x4503
913D
Too Easy Problems
binary search
,
brute force
,
data structures
,
greedy
,
sortings
1800
x4492
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x4490
321E
Ciel and Gondolas
data structures
,
divide and conquer
,
dp
2600
x4481
833B
The Bakery
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2200
x4477
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x4463
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4452
229B
Planets
binary search
,
data structures
,
graphs
,
shortest paths
1700
x4447
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x4446
739B
Alyona and a tree
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
1900
x4418
900C
Remove Extra One
brute force
,
data structures
,
math
1700
x4408
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4392
817D
Imbalanced Array
data structures
,
divide and conquer
,
dsu
,
sortings
1900
x4382
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4380
1182C
Beautiful Lyrics
data structures
,
greedy
,
strings
1700
x4379
280B
Maximum Xor Secondary
data structures
,
implementation
,
two pointers
1800
x4357
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4353
552D
Vanya and Triangles
brute force
,
combinatorics
,
data structures
,
geometry
,
math
,
sortings
1900
x4351
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4333
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4333
1525C
Robot Collisions
data structures
,
greedy
,
implementation
,
sortings
2000
x4324
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x4296
367A
Sereja and Algorithm
data structures
,
implementation
1500
x4282
1702G2
Passable Paths (hard version)
data structures
,
dfs and similar
,
trees
2000
x4277
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4251
1569D
Inconvenient Pairs
binary search
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x4240
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4231
1227D2
Optimal Subsequences (Hard Version)
data structures
,
greedy
1800
x4222
1575A
Another Sorting Problem
data structures
,
sortings
,
strings
1100
x4213
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4203
1759G
Restore the Permutation
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
1900
x4201
140C
New Year Snowmen
binary search
,
data structures
,
greedy
1800
x4196
1418D
Trash Problem
data structures
,
implementation
2100
x4170
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4161
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4154
923C
Perfect Security
data structures
,
greedy
,
strings
,
trees
1800
x4146
999D
Equalize the Remainders
data structures
,
greedy
,
implementation
1900
x4139
733D
Kostya the Sculptor
data structures
,
hashing
1600
x4130
1257E
The Contest
data structures
,
dp
,
greedy
2000
x4116
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4115
514D
R2D2 and Droid Army
binary search
,
data structures
,
two pointers
2000
x4102
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4095
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4091
1514D
Cut and Stick
binary search
,
data structures
,
greedy
,
implementation
,
sortings
2000
x4081
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4080
270B
Multithreading
data structures
,
greedy
,
implementation
1400
x4071
1141F2
Same Sum Blocks (Hard)
data structures
,
greedy
1900
x4048
797E
Array Queries
brute force
,
data structures
,
dp
2000
x4043
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x4029
69E
Subsegments
data structures
,
implementation
1800
x4023
1689D
Lena and Matrix
data structures
,
dp
,
geometry
,
shortest paths
1900
x4019
1677B
Tokitsukaze and Meeting
data structures
,
implementation
,
math
1700
x4009
319B
Psychos in a Line
data structures
,
implementation
1900
x4009
1650E
Rescheduling the Exam
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1900
x4002
1716C
Robot in a Hallway
data structures
,
dp
,
greedy
,
implementation
,
ternary search
2000
x4000
915E
Physical Education Lessons
data structures
,
implementation
,
sortings
2300
x3986
1023D
Array Restoration
constructive algorithms
,
data structures
1700
x3944
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x3941
557C
Arthur and Table
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
1900
x3937
827A
String Reconstruction
data structures
,
greedy
,
sortings
,
strings
1700
x3936
1311F
Moving Points
data structures
,
divide and conquer
,
implementation
,
sortings
1900
x3929
1200D
White Lines
brute force
,
data structures
,
dp
,
implementation
,
two pointers
1900
x3909
292E
Copying Data
data structures
1900
x3894
1479B2
Painting the Array II
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2100
x3893
1322B
Present
binary search
,
bitmasks
,
constructive algorithms
,
data structures
,
math
,
sortings
2100
x3893
888G
Xor-MST
bitmasks
,
constructive algorithms
,
data structures
2300
x3871
1474D
Cleaning
data structures
,
dp
,
greedy
,
math
2200
x3866
629D
Babaei and Birthday Cake
data structures
,
dp
2000
x3860
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3859
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x3856
777E
Hanoi Factory
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x3855
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3853
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3792
652D
Nested Segments
data structures
,
sortings
1800
x3784
1237D
Balanced Playlist
binary search
,
data structures
,
implementation
2000
x3780
1083E
The Fair Nut and Rectangles
data structures
,
dp
,
geometry
2400
x3776
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3771
685B
Kay and Snowflake
data structures
,
dfs and similar
,
dp
,
trees
1900
x3762
1904D2
Set To Max (Hard Version)
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
sortings
1800
x3752
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x3725
1278D
Segment Tree
data structures
,
dsu
,
graphs
,
trees
2100
x3719
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x3711
858D
Polycarp's phone book
data structures
,
implementation
,
sortings
1600
x3709
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3693
903D
Almost Difference
data structures
,
math
2200
x3691
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3684
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3683
631C
Report
data structures
,
sortings
1700
x3681
555B
Case of Fugitive
data structures
,
greedy
,
sortings
2000
x3680
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x3675
924C
Riverside Curio
data structures
,
dp
,
greedy
1700
x3675
587C
Duff in the Army
data structures
,
trees
2200
x3671
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3655
1299C
Water Balance
data structures
,
geometry
,
greedy
2100
x3636
1902D
Robot Queries
binary search
,
data structures
,
dp
,
implementation
1900
x3631
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