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Before contest
Codeforces Round 941 (Div. 1)
3 days
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Before contest
Codeforces Round 941 (Div. 2)
3 days
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→ Filter Problems
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constructive algorithms
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
1428D
Bouncing Boomerangs
constructive algorithms
,
greedy
,
implementation
1900
x4397
1567D
Expression Evaluation Error
constructive algorithms
,
greedy
,
implementation
,
math
2000
x4394
1481D
AB Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2000
x4383
1081B
Farewell Party
constructive algorithms
,
implementation
1500
x4383
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4378
644A
Parliament of Berland
*special problem
,
constructive algorithms
1000
x4375
894B
Ralph And His Magic Field
combinatorics
,
constructive algorithms
,
math
,
number theory
1800
x4369
831C
Jury Marks
brute force
,
constructive algorithms
1700
x4362
1270D
Strange Device
constructive algorithms
,
interactive
,
math
,
sortings
1900
x4360
623A
Graph and String
constructive algorithms
,
graphs
1800
x4354
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4341
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4329
476D
Dreamoon and Sets
constructive algorithms
,
greedy
,
math
1900
x4312
1365F
Swaps Again
constructive algorithms
,
implementation
,
sortings
2100
x4300
1179B
Tolik and His Uncle
constructive algorithms
1800
x4293
894C
Marco and GCD Sequence
constructive algorithms
,
math
1900
x4276
1360H
Binary Median
binary search
,
bitmasks
,
brute force
,
constructive algorithms
2100
x4275
1521C
Nastia and a Hidden Permutation
constructive algorithms
,
interactive
2000
x4273
1697D
Guess The String
binary search
,
constructive algorithms
,
interactive
1900
x4250
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4249
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4249
1717D
Madoka and The Corruption Scheme
combinatorics
,
constructive algorithms
,
greedy
,
math
1900
x4237
1463D
Pairs
binary search
,
constructive algorithms
,
greedy
,
two pointers
1900
x4228
1054C
Candies Distribution
constructive algorithms
,
implementation
1500
x4227
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x4216
1759G
Restore the Permutation
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
1900
x4199
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4186
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x4181
865A
Save the problem!
constructive algorithms
1400
x4135
617D
Polyline
constructive algorithms
,
implementation
1700
x4127
1237C2
Balanced Removals (Harder)
binary search
,
constructive algorithms
,
divide and conquer
,
greedy
,
implementation
,
sortings
1900
x4126
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4117
1178E
Archaeology
brute force
,
constructive algorithms
,
greedy
,
strings
1900
x4113
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4092
1425H
Huge Boxes of Animal Toys
constructive algorithms
1300
x4074
1453D
Checkpoints
brute force
,
constructive algorithms
,
greedy
,
math
,
probabilities
1900
x4072
8B
Obsession with Robots
constructive algorithms
,
graphs
,
implementation
1400
x4064
1438D
Powerful Ksenia
bitmasks
,
constructive algorithms
,
math
2200
x4056
1421D
Hexagons
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
1900
x4046
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x4027
774C
Maximum Number
*special problem
,
constructive algorithms
,
greedy
,
implementation
1200
x4018
1620D
Exact Change
brute force
,
constructive algorithms
,
greedy
2000
x4017
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4014
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x4009
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x4007
311A
The Closest Pair
constructive algorithms
,
implementation
1300
x3992
932C
Permutation Cycle
brute force
,
constructive algorithms
1600
x3964
1621D
The Winter Hike
constructive algorithms
,
greedy
,
math
2100
x3954
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x3950
1023D
Array Restoration
constructive algorithms
,
data structures
1700
x3942
761D
Dasha and Very Difficult Problem
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
1700
x3939
1773F
Football
constructive algorithms
800
x3937
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x3932
862C
Mahmoud and Ehab and the xor
constructive algorithms
1900
x3929
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3924
1118E
Yet Another Ball Problem
constructive algorithms
,
implementation
1700
x3901
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x3900
1842D
Tenzing and His Animal Friends
constructive algorithms
,
graphs
,
greedy
1900
x3899
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
x3887
1032C
Playing Piano
constructive algorithms
,
dp
1700
x3884
632B
Alice, Bob, Two Teams
brute force
,
constructive algorithms
1400
x3884
888G
Xor-MST
bitmasks
,
constructive algorithms
,
data structures
2300
x3868
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3857
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x3849
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x3837
543B
Destroying Roads
constructive algorithms
,
graphs
,
shortest paths
2100
x3828
193A
Cutting Figure
constructive algorithms
,
graphs
,
trees
1700
x3825
1508B
Almost Sorted
binary search
,
combinatorics
,
constructive algorithms
,
implementation
1800
x3823
758C
Unfair Poll
binary search
,
constructive algorithms
,
implementation
,
math
1700
x3817
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x3808
960C
Subsequence Counting
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1700
x3806
1110E
Magic Stones
constructive algorithms
,
math
,
sortings
2200
x3800
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x3793
551B
ZgukistringZ
brute force
,
constructive algorithms
,
implementation
,
strings
1800
x3758
990D
Graph And Its Complement
constructive algorithms
,
graphs
,
implementation
1700
x3754
1301D
Time to Run
constructive algorithms
,
graphs
,
implementation
2000
x3752
638A
Home Numbers
*special problem
,
constructive algorithms
,
math
1100
x3748
1904D2
Set To Max (Hard Version)
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
sortings
1800
x3742
1641B
Repetitions Decoding
constructive algorithms
,
implementation
,
sortings
2000
x3719
746C
Tram
constructive algorithms
,
implementation
,
math
1600
x3681
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3674
989C
A Mist of Florescence
constructive algorithms
,
graphs
1800
x3652
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3649
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3645
949B
A Leapfrog in the Array
constructive algorithms
,
math
1700
x3638
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3633
1333D
Challenges in school №41
brute force
,
constructive algorithms
,
games
,
graphs
,
greedy
,
implementation
,
sortings
2100
x3630
729D
Sea Battle
constructive algorithms
,
greedy
,
math
1700
x3607
1157D
N Problems During K Days
constructive algorithms
,
greedy
,
math
1900
x3602
297A
Parity Game
constructive algorithms
1700
x3577
1470D
Strange Housing
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
2200
x3570
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3567
231B
Magic, Wizardry and Wonders
constructive algorithms
,
greedy
1500
x3552
1332E
Height All the Same
combinatorics
,
constructive algorithms
,
math
,
matrices
2100
x3551
1082D
Maximum Diameter Graph
constructive algorithms
,
graphs
,
implementation
1800
x3543
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3532
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3521
1450C2
Errich-Tac-Toe (Hard Version)
constructive algorithms
,
math
2300
x3501
1041E
Tree Reconstruction
constructive algorithms
,
data structures
,
graphs
,
greedy
1900
x3498
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