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Before contest
Codeforces Round 937 (Div. 4)
00:54:40
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Difficulty:
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combinatorics
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
1777B
Emordnilap
combinatorics
,
greedy
,
math
900
x16466
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1924
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x323
1773G
Game of Questions
bitmasks
,
combinatorics
,
dp
,
fft
,
math
,
probabilities
2800
x306
1773D
Dominoes
combinatorics
,
flows
,
graph matchings
,
greedy
2600
x408
1771A
Hossam and Combinatorics
combinatorics
,
math
,
sortings
900
x21803
1770F
Koxia and Sequence
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
3100
x580
1770E
Koxia and Tree
combinatorics
,
dfs and similar
,
dp
,
dsu
,
math
,
probabilities
,
trees
2400
x1283
1768E
Partial Sorting
combinatorics
,
math
,
number theory
2300
x1759
1767D
Playoff
combinatorics
,
constructive algorithms
,
dp
,
greedy
,
math
1500
x9272
1765C
Card Guessing
combinatorics
,
dp
,
probabilities
2600
x354
1764D
Doremy's Pegging Game
combinatorics
,
dp
,
math
2000
x2586
1763D
Valid Bitonic Permutations
combinatorics
,
dp
,
implementation
,
math
,
number theory
2200
x1925
1762E
Tree Sum
combinatorics
,
math
,
trees
2600
x582
1762C
Binary Strings are Fun
combinatorics
,
math
1400
x8756
1761F2
Anti-median (Hard Version)
combinatorics
,
dp
,
math
3500
x74
1761D
Carry Bit
combinatorics
,
math
2100
x2303
1758E
Tick, Tock
combinatorics
,
dfs and similar
,
dsu
,
graphs
2500
x764
1750G
Doping
combinatorics
,
dp
,
math
3300
x218
1750F
Majority
combinatorics
,
dp
,
math
,
strings
2700
x819
1750D
Count GCD
combinatorics
,
math
,
number theory
1800
x5446
1749D
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
1900
x5180
1748D
ConstructOR
bitmasks
,
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
math
,
number theory
2100
x2625
1747E
List Generation
combinatorics
,
dp
,
math
2900
x477
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x237
1743A
Password
brute force
,
combinatorics
,
implementation
,
math
800
x25843
1740F
Conditional Mix
combinatorics
,
dp
,
math
2600
x739
1739C
Card Game
combinatorics
,
constructive algorithms
,
dp
,
games
1500
x8596
1738E
Balance Addicts
combinatorics
,
dp
,
math
,
two pointers
2300
x1442
1737E
Ela Goes Hiking
combinatorics
,
dp
,
math
,
probabilities
2500
x879
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5202
1732A
Bestie
brute force
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x14292
1731F
Function Sum
brute force
,
combinatorics
,
dp
,
fft
,
math
2500
x647
1730E
Maximums and Minimums
combinatorics
,
data structures
,
divide and conquer
,
number theory
2700
x596
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2030
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x385
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x276
1726E
Almost Perfect
combinatorics
,
fft
,
math
2400
x1328
1725I
Imitating the Key Tree
combinatorics
,
dsu
,
trees
2800
x176
1725E
Electrical Efficiency
combinatorics
,
data structures
,
dp
,
math
,
number theory
,
trees
2500
x424
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1519
1717D
Madoka and The Corruption Scheme
combinatorics
,
constructive algorithms
,
greedy
,
math
1900
x4206
1716F
Bags with Balls
combinatorics
,
dp
,
math
,
number theory
2500
x986
1715C
Monoblock
combinatorics
,
data structures
,
implementation
,
math
1700
x8239
1713F
Lost Array
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
2900
x498
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2019
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x550
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x1955
1705D
Mark and Lightbulbs
combinatorics
,
constructive algorithms
,
greedy
,
math
,
sortings
1800
x6038
1704H2
Game of AI (hard version)
combinatorics
,
fft
,
math
3500
x70
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x166
1701F
Points
combinatorics
,
data structures
,
implementation
,
math
,
matrices
2500
x875
1699C
The Third Problem
combinatorics
,
constructive algorithms
,
math
1700
x9288
1698E
PermutationForces II
brute force
,
combinatorics
,
greedy
,
sortings
,
trees
,
two pointers
2300
x1558
1697E
Coloring
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
implementation
,
math
2400
x1123
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x135
1696E
Placing Jinas
combinatorics
,
math
2000
x3788
1691F
K-Set Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2500
x895
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x208
1679E
Typical Party in Dorm
bitmasks
,
combinatorics
,
dp
,
strings
2400
x1074
1674C
Infinite Replacement
combinatorics
,
implementation
,
strings
1000
x22692
1674B
Dictionary
combinatorics
,
math
800
x25422
1673E
Power or XOR?
bitmasks
,
combinatorics
,
math
,
number theory
2500
x650
1673D
Lost Arithmetic Progression
combinatorics
,
math
,
number theory
1900
x3158
1671F
Permutation Counting
brute force
,
combinatorics
,
dp
,
fft
,
math
2700
x311
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2618
1670F
Jee, You See?
bitmasks
,
combinatorics
,
dp
2400
x908
1667E
Centroid Probabilities
combinatorics
,
dp
,
fft
,
math
3000
x609
1666F
Fancy Stack
combinatorics
,
dp
,
implementation
2200
x1075
1663D
Is it rated - 3
*special problem
,
combinatorics
,
dp
,
math
x1353
1662N
Drone Photo
combinatorics
,
math
,
sortings
x676
1658B
Marin and Anti-coprime Permutation
combinatorics
,
math
,
number theory
800
x18276
1657E
Star MST
combinatorics
,
dp
,
graph matchings
,
math
2200
x1952
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x68
1651E
Sum of Matchings
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
greedy
,
math
2600
x485
1648C
Tyler and Strings
combinatorics
,
data structures
,
implementation
1900
x2832
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x11524
1644F
Basis
combinatorics
,
fft
,
math
,
number theory
2900
x306
1644E
Expand the Path
brute force
,
combinatorics
,
data structures
,
implementation
,
math
1900
x2921
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x199
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1029
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x413
1628D2
Game on Sum (Hard Version)
combinatorics
,
dp
,
games
,
math
2400
x1952
1628D1
Game on Sum (Easy Version)
combinatorics
,
dp
,
games
,
math
2100
x2984
1626F
A Random Code Problem
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2800
x693
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x3847
1620G
Subsequences Galore
bitmasks
,
combinatorics
,
dp
2400
x847
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x749
1615F
LEGOndary Grandmaster
combinatorics
,
dp
,
math
2800
x721
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x9839
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x630
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x808
1610D
Not Quite Lee
combinatorics
,
dp
,
math
,
number theory
2000
x2550
1608F
MEX counting
combinatorics
,
dp
,
implementation
3200
x507
1608D
Dominoes
combinatorics
,
fft
,
graphs
,
math
,
number theory
2400
x1342
1606E
Arena
combinatorics
,
dp
,
math
2100
x3303
1605F
PalindORme
combinatorics
,
dp
2900
x281
1603F
October 18, 2017
combinatorics
,
dp
,
implementation
,
math
2700
x258
1603E
A Perfect Problem
combinatorics
,
dp
,
math
3200
x387
1599C
Bubble Strike
combinatorics
,
math
,
probabilities
,
ternary search
2000
x1539
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