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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
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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
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
1181C
Flag
brute force
,
combinatorics
,
dp
,
implementation
1900
x3000
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x2976
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x2962
1644E
Expand the Path
brute force
,
combinatorics
,
data structures
,
implementation
,
math
1900
x2949
1009E
Intercity Travelling
combinatorics
,
math
,
probabilities
2000
x2881
997B
Roman Digits
brute force
,
combinatorics
,
dp
,
greedy
,
math
2000
x2853
1648C
Tyler and Strings
combinatorics
,
data structures
,
implementation
1900
x2848
288B
Polo the Penguin and Houses
combinatorics
1500
x2843
466D
Increase Sequence
combinatorics
,
dp
2100
x2826
1342E
Placing Rooks
combinatorics
,
fft
,
math
2300
x2801
319A
Malek Dance Club
combinatorics
,
math
1600
x2752
383E
Vowels
combinatorics
,
divide and conquer
,
dp
2700
x2703
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2692
128C
Games with Rectangle
combinatorics
,
dp
2000
x2687
839D
Winter is here
combinatorics
,
dp
,
math
,
number theory
2200
x2678
932E
Team Work
combinatorics
,
dp
,
math
2400
x2665
1748D
ConstructOR
bitmasks
,
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
math
,
number theory
2100
x2644
626D
Jerry's Protest
brute force
,
combinatorics
,
dp
,
probabilities
1800
x2644
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2635
785D
Anton and School - 2
combinatorics
,
dp
,
math
,
number theory
2300
x2630
1764D
Doremy's Pegging Game
combinatorics
,
dp
,
math
2000
x2626
630G
Challenge Pennants
combinatorics
,
math
1600
x2612
1334E
Divisor Paths
combinatorics
,
graphs
,
greedy
,
math
,
number theory
2200
x2587
272D
Dima and Two Sequences
combinatorics
,
math
,
sortings
1600
x2580
1610D
Not Quite Lee
combinatorics
,
dp
,
math
,
number theory
2000
x2572
1185G1
Playlist for Polycarp (easy version)
bitmasks
,
combinatorics
,
dp
2100
x2547
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2533
1778D
Flexible String Revisit
combinatorics
,
dp
,
math
,
probabilities
2100
x2524
1542D
Priority Queue
combinatorics
,
dp
,
implementation
,
math
,
ternary search
2200
x2524
1540B
Tree Array
brute force
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
,
trees
2300
x2480
1228E
Another Filling the Grid
combinatorics
,
dp
,
math
2300
x2473
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2463
1511E
Colorings and Dominoes
combinatorics
,
dp
,
greedy
,
math
2100
x2443
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2388
1167E
Range Deleting
binary search
,
combinatorics
,
data structures
,
two pointers
2100
x2385
1073E
Segment Sum
bitmasks
,
combinatorics
,
dp
,
math
2300
x2372
1536E
Omkar and Forest
combinatorics
,
graphs
,
math
,
shortest paths
2300
x2332
1761D
Carry Bit
combinatorics
,
math
2100
x2312
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2311
57C
Array
combinatorics
,
math
1900
x2302
340E
Iahub and Permutations
combinatorics
,
math
2000
x2296
1371E2
Asterism (Hard Version)
binary search
,
combinatorics
,
dp
,
math
,
number theory
,
sortings
2300
x2290
156C
Cipher
combinatorics
,
dp
2000
x2279
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2276
351B
Jeff and Furik
combinatorics
,
dp
,
probabilities
1900
x2268
596C
Wilbur and Points
combinatorics
,
greedy
,
sortings
1700
x2233
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x2224
568B
Symmetric and Transitive
combinatorics
,
dp
,
math
1900
x2218
1559E
Mocha and Stars
combinatorics
,
dp
,
fft
,
math
,
number theory
2200
x2210
353B
Two Heaps
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1900
x2168
1043F
Make It One
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
,
shortest paths
2500
x2164
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2163
557D
Vitaly and Cycle
combinatorics
,
dfs and similar
,
graphs
,
math
2000
x2129
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2102
553B
Kyoya and Permutation
binary search
,
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
1900
x2094
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2078
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2046
296B
Yaroslav and Two Strings
combinatorics
,
dp
2000
x2045
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x2044
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2042
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2030
571A
Lengthening Sticks
combinatorics
,
implementation
,
math
2100
x2004
52B
Right Triangles
combinatorics
1600
x1976
1657E
Star MST
combinatorics
,
dp
,
graph matchings
,
math
2200
x1974
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x1968
1628D2
Game on Sum (Hard Version)
combinatorics
,
dp
,
games
,
math
2400
x1966
875D
High Cry
binary search
,
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
2200
x1964
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x1952
1763D
Valid Bitonic Permutations
combinatorics
,
dp
,
implementation
,
math
,
number theory
2200
x1944
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1938
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x1930
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x1930
1178F1
Short Colorful Strip
combinatorics
,
dfs and similar
,
dp
2200
x1896
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x1892
1140E
Palindrome-less Arrays
combinatorics
,
divide and conquer
,
dp
2200
x1880
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1879
1485F
Copy or Prefix Sum
combinatorics
,
data structures
,
dp
,
sortings
2400
x1858
1292C
Xenon's Attack on the Gangs
combinatorics
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1858
1027E
Inverse Coloring
combinatorics
,
dp
,
math
2100
x1856
1527D
MEX Tree
combinatorics
,
dfs and similar
,
implementation
,
math
,
trees
2400
x1815
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1804
689E
Mike and Geometry Problem
combinatorics
,
data structures
,
dp
,
geometry
,
implementation
2000
x1801
570E
Pig and Palindromes
combinatorics
,
dp
2300
x1798
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1790
1550D
Excellent Arrays
binary search
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
sortings
,
two pointers
2300
x1778
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1769
1768E
Partial Sorting
combinatorics
,
math
,
number theory
2300
x1764
258C
Little Elephant and LCM
binary search
,
combinatorics
,
dp
,
math
2000
x1752
1551F
Equidistant Vertices
brute force
,
combinatorics
,
dfs and similar
,
dp
,
trees
2200
x1736
1267K
Key Storage
combinatorics
,
math
2100
x1736
1548C
The Three Little Pigs
combinatorics
,
dp
,
fft
,
math
2500
x1732
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1721
1418E
Expected Damage
binary search
,
combinatorics
,
probabilities
2400
x1716
1245F
Daniel and Spring Cleaning
bitmasks
,
brute force
,
combinatorics
,
dp
2300
x1715
1028D
Order book
combinatorics
,
data structures
,
greedy
2100
x1707
1278F
Cards
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2600
x1705
920G
List Of Integers
binary search
,
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2200
x1668
213B
Numbers
combinatorics
,
dp
1900
x1662
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1653
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1636
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