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Before contest
Codeforces Round (Div. 3)
7 days
→ Filter Problems
Difficulty:
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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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Status
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Custom test
Problems
#
Name
615B
Longtail Hedgehog
dp
,
graphs
1600
x4979
615A
Bulbs
implementation
800
x16690
614B
Gena's Code
implementation
,
math
1400
x6802
614A
Link/Cut Tree
brute force
,
implementation
1500
x7413
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x456
613D
Kingdom and its Cities
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
sortings
,
trees
2800
x2715
613C
Necklace
constructive algorithms
,
math
2500
x975
613B
Skills
binary search
,
brute force
,
dp
,
greedy
,
sortings
,
two pointers
1900
x2175
613A
Peter and Snow Blower
binary search
,
geometry
,
ternary search
1900
x3189
612F
Simba on the Circle
dp
2600
x373
612E
Square Root of Permutation
combinatorics
,
constructive algorithms
,
dfs and similar
,
graphs
,
math
2200
x1590
612D
The Union of k-Segments
greedy
,
sortings
1800
x3714
612C
Replace To Make Regular Bracket Sequence
data structures
,
expression parsing
,
math
1400
x7791
612B
HDD is Outdated Technology
implementation
,
math
1200
x6863
612A
The Text Splitting
brute force
,
implementation
,
strings
1300
x7073
611H
New Year and Forgotten Tree
constructive algorithms
,
flows
,
graphs
3200
x579
611G
New Year and Cake
geometry
,
two pointers
2900
x426
611F
New Year and Cleaning
binary search
,
implementation
2500
x455
611E
New Year and Three Musketeers
data structures
,
greedy
,
sortings
2400
x856
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2523
611C
New Year and Domino
dp
,
implementation
1500
x8356
611B
New Year and Old Property
bitmasks
,
brute force
,
implementation
1300
x9845
611A
New Year and Days
implementation
900
x11578
610E
Alphabet Permutations
data structures
,
strings
2500
x853
610D
Vika and Segments
constructive algorithms
,
data structures
,
geometry
,
two pointers
2300
x1456
610C
Harmony Analysis
constructive algorithms
1800
x2792
610B
Vika and Squares
constructive algorithms
,
implementation
1300
x7103
610A
Pasha and Stick
combinatorics
,
math
1000
x22316
609F
Frogs and mosquitoes
data structures
,
greedy
2500
x1205
609E
Minimum spanning tree for each edge
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x7121
609D
Gadgets for dollars and pounds
binary search
,
greedy
,
two pointers
2000
x2629
609C
Load Balancing
implementation
,
math
1500
x6373
609B
The Best Gift
constructive algorithms
,
implementation
1100
x8869
609A
USB Flash Drives
greedy
,
implementation
,
sortings
800
x16883
608B
Hamming Distance Sum
combinatorics
,
strings
1500
x6668
608A
Saitama Destroys Hotel
implementation
,
math
1000
x9176
607E
Cross Sum
binary search
,
geometry
3300
x250
607D
Power Tree
data structures
,
trees
2600
x561
607C
Marbles
hashing
,
strings
2500
x780
607B
Zuma
dp
1900
x11162
607A
Chain Reaction
binary search
,
dp
1600
x9394
606B
Testing Robots
implementation
1600
x2733
606A
Magic Spheres
implementation
1200
x7753
605E
Intergalaxy Trips
probabilities
,
shortest paths
2700
x1324
605D
Board Game
data structures
,
dfs and similar
2500
x792
605C
Freelancer's Dreams
geometry
2400
x1099
605B
Lazy Student
constructive algorithms
,
data structures
,
graphs
1700
x3399
605A
Sorting Railway Cars
constructive algorithms
,
greedy
1600
x7055
604B
More Cowbell
binary search
,
greedy
1400
x8294
604A
Uncowed Forces
implementation
1000
x8881
603E
Pastoral Oddities
data structures
,
divide and conquer
,
dsu
,
math
,
trees
3000
x1180
603D
Ruminations on Ruminants
geometry
,
math
2900
x339
603C
Lieges of Legendre
games
,
math
2200
x1812
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2542
603A
Alternative Thinking
dp
,
greedy
,
math
1600
x7570
602B
Approximating a Constant Range
dp
,
implementation
,
two pointers
1400
x10508
602A
Two Bases
brute force
,
implementation
1100
x8381
601E
A Museum Robbery
data structures
,
dp
2800
x813
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1096
601C
Kleofáš and the n-thlon
dp
,
math
,
probabilities
2300
x1292
601B
Lipshitz Sequence
data structures
,
math
2100
x2071
601A
The Two Routes
graphs
,
shortest paths
1600
x11565
600F
Edge coloring of bipartite graph
graphs
2800
x747
600E
Lomsat gelral
data structures
,
dfs and similar
,
dsu
,
trees
2300
x12850
600D
Area of Two Circles' Intersection
geometry
2000
x2158
600C
Make Palindrome
constructive algorithms
,
greedy
,
strings
1800
x5772
600B
Queries about less or equal elements
binary search
,
data structures
,
sortings
,
two pointers
1300
x27930
600A
Extract Numbers
implementation
,
strings
1600
x4963
599E
Sandy and Nuts
bitmasks
,
dp
,
trees
2600
x626
599D
Spongebob and Squares
brute force
,
math
1900
x2534
599C
Day at the Beach
sortings
1600
x4589
599B
Spongebob and Joke
implementation
1500
x4343
599A
Patrick and Shopping
implementation
800
x28030
598F
Cut Length
geometry
2900
x362
598E
Chocolate Bar
brute force
,
dp
2000
x4687
598D
Igor In the Museum
dfs and similar
,
graphs
,
shortest paths
1700
x10628
598C
Nearest vectors
geometry
,
sortings
2300
x4196
598B
Queries on a String
implementation
,
strings
1300
x10663
598A
Tricky Sum
math
900
x25172
597C
Subsequences
data structures
,
dp
1900
x4618
597B
Restaurant
dp
,
greedy
,
sortings
1600
x4686
597A
Divisibility
math
1600
x4423
596E
Wilbur and Strings
dfs and similar
,
dp
,
graphs
,
strings
2500
x389
596D
Wilbur and Trees
dp
,
math
,
probabilities
,
sortings
2300
x678
596C
Wilbur and Points
combinatorics
,
greedy
,
sortings
1700
x2240
596B
Wilbur and Array
greedy
,
implementation
1100
x10224
596A
Wilbur and Swimming Pool
geometry
,
implementation
1100
x7638
595B
Pasha and Phone
binary search
,
math
1600
x2898
595A
Vitaly and Night
constructive algorithms
,
implementation
800
x14398
594E
Cutting the Line
string suffix structures
,
strings
3100
x157
594D
REQ
data structures
,
number theory
2500
x1527
594C
Edo and Magnets
brute force
,
greedy
,
implementation
,
two pointers
2300
x675
594B
Max and Bike
binary search
,
geometry
2500
x476
594A
Warrior and Archer
games
2300
x1697
593E
Strange Calculation and Cats
dp
,
matrices
2400
x452
593D
Happy Tree Party
data structures
,
dfs and similar
,
graphs
,
math
,
trees
2400
x1182
593C
Beautiful Function
constructive algorithms
,
math
2200
x279
593B
Anton and Lines
geometry
,
sortings
1600
x3951
593A
2Char
brute force
,
implementation
1200
x5688
592E
BCPC
binary search
,
geometry
,
two pointers
2700
x213
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