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Before contest
Codeforces Round 941 (Div. 1)
21:39:28
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Before contest
Codeforces Round 941 (Div. 2)
21:39:28
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combinatorics
combine-tags-by-or
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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
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number theory
probabilities
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shortest paths
sortings
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ternary search
trees
two pointers
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Name
1628D1
Game on Sum (Easy Version)
combinatorics
,
dp
,
games
,
math
2100
x3006
1181C
Flag
brute force
,
combinatorics
,
dp
,
implementation
1900
x3000
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x2982
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x2969
1644E
Expand the Path
brute force
,
combinatorics
,
data structures
,
implementation
,
math
1900
x2957
1009E
Intercity Travelling
combinatorics
,
math
,
probabilities
2000
x2882
1648C
Tyler and Strings
combinatorics
,
data structures
,
implementation
1900
x2857
997B
Roman Digits
brute force
,
combinatorics
,
dp
,
greedy
,
math
2000
x2856
288B
Polo the Penguin and Houses
combinatorics
1500
x2844
466D
Increase Sequence
combinatorics
,
dp
2100
x2831
1342E
Placing Rooks
combinatorics
,
fft
,
math
2300
x2804
319A
Malek Dance Club
combinatorics
,
math
1600
x2752
383E
Vowels
combinatorics
,
divide and conquer
,
dp
2700
x2712
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2701
128C
Games with Rectangle
combinatorics
,
dp
2000
x2687
839D
Winter is here
combinatorics
,
dp
,
math
,
number theory
2200
x2682
932E
Team Work
combinatorics
,
dp
,
math
2400
x2679
1748D
ConstructOR
bitmasks
,
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
math
,
number theory
2100
x2653
626D
Jerry's Protest
brute force
,
combinatorics
,
dp
,
probabilities
1800
x2647
785D
Anton and School - 2
combinatorics
,
dp
,
math
,
number theory
2300
x2640
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2639
1764D
Doremy's Pegging Game
combinatorics
,
dp
,
math
2000
x2631
630G
Challenge Pennants
combinatorics
,
math
1600
x2617
1334E
Divisor Paths
combinatorics
,
graphs
,
greedy
,
math
,
number theory
2200
x2589
272D
Dima and Two Sequences
combinatorics
,
math
,
sortings
1600
x2581
1610D
Not Quite Lee
combinatorics
,
dp
,
math
,
number theory
2000
x2574
1185G1
Playlist for Polycarp (easy version)
bitmasks
,
combinatorics
,
dp
2100
x2553
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2533
1778D
Flexible String Revisit
combinatorics
,
dp
,
math
,
probabilities
2100
x2531
1542D
Priority Queue
combinatorics
,
dp
,
implementation
,
math
,
ternary search
2200
x2526
1228E
Another Filling the Grid
combinatorics
,
dp
,
math
2300
x2488
1540B
Tree Array
brute force
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
,
trees
2300
x2483
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2479
1511E
Colorings and Dominoes
combinatorics
,
dp
,
greedy
,
math
2100
x2454
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2407
1167E
Range Deleting
binary search
,
combinatorics
,
data structures
,
two pointers
2100
x2396
1073E
Segment Sum
bitmasks
,
combinatorics
,
dp
,
math
2300
x2374
1536E
Omkar and Forest
combinatorics
,
graphs
,
math
,
shortest paths
2300
x2337
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2330
1761D
Carry Bit
combinatorics
,
math
2100
x2317
57C
Array
combinatorics
,
math
1900
x2311
340E
Iahub and Permutations
combinatorics
,
math
2000
x2297
1371E2
Asterism (Hard Version)
binary search
,
combinatorics
,
dp
,
math
,
number theory
,
sortings
2300
x2292
156C
Cipher
combinatorics
,
dp
2000
x2281
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2279
351B
Jeff and Furik
combinatorics
,
dp
,
probabilities
1900
x2271
596C
Wilbur and Points
combinatorics
,
greedy
,
sortings
1700
x2234
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x2231
568B
Symmetric and Transitive
combinatorics
,
dp
,
math
1900
x2219
1559E
Mocha and Stars
combinatorics
,
dp
,
fft
,
math
,
number theory
2200
x2212
1043F
Make It One
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
,
shortest paths
2500
x2170
353B
Two Heaps
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1900
x2169
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2166
557D
Vitaly and Cycle
combinatorics
,
dfs and similar
,
graphs
,
math
2000
x2132
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2103
553B
Kyoya and Permutation
binary search
,
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
1900
x2094
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2091
296B
Yaroslav and Two Strings
combinatorics
,
dp
2000
x2052
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2051
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2051
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x2046
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2036
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2013
571A
Lengthening Sticks
combinatorics
,
implementation
,
math
2100
x2006
1657E
Star MST
combinatorics
,
dp
,
graph matchings
,
math
2200
x1984
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x1982
52B
Right Triangles
combinatorics
1600
x1978
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x1977
875D
High Cry
binary search
,
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
2200
x1970
1628D2
Game on Sum (Hard Version)
combinatorics
,
dp
,
games
,
math
2400
x1969
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x1958
1763D
Valid Bitonic Permutations
combinatorics
,
dp
,
implementation
,
math
,
number theory
2200
x1952
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1945
1178F1
Short Colorful Strip
combinatorics
,
dfs and similar
,
dp
2200
x1901
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x1900
1140E
Palindrome-less Arrays
combinatorics
,
divide and conquer
,
dp
2200
x1884
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1881
1292C
Xenon's Attack on the Gangs
combinatorics
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1867
1485F
Copy or Prefix Sum
combinatorics
,
data structures
,
dp
,
sortings
2400
x1862
1027E
Inverse Coloring
combinatorics
,
dp
,
math
2100
x1858
1527D
MEX Tree
combinatorics
,
dfs and similar
,
implementation
,
math
,
trees
2400
x1822
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1807
689E
Mike and Geometry Problem
combinatorics
,
data structures
,
dp
,
geometry
,
implementation
2000
x1806
570E
Pig and Palindromes
combinatorics
,
dp
2300
x1801
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1791
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1783
1550D
Excellent Arrays
binary search
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
sortings
,
two pointers
2300
x1779
1768E
Partial Sorting
combinatorics
,
math
,
number theory
2300
x1768
258C
Little Elephant and LCM
binary search
,
combinatorics
,
dp
,
math
2000
x1754
1551F
Equidistant Vertices
brute force
,
combinatorics
,
dfs and similar
,
dp
,
trees
2200
x1740
1267K
Key Storage
combinatorics
,
math
2100
x1737
1548C
The Three Little Pigs
combinatorics
,
dp
,
fft
,
math
2500
x1734
1418E
Expected Damage
binary search
,
combinatorics
,
probabilities
2400
x1723
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1722
1245F
Daniel and Spring Cleaning
bitmasks
,
brute force
,
combinatorics
,
dp
2300
x1715
1278F
Cards
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2600
x1710
1028D
Order book
combinatorics
,
data structures
,
greedy
2100
x1708
920G
List Of Integers
binary search
,
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2200
x1671
213B
Numbers
combinatorics
,
dp
1900
x1662
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1654
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