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ICPC Challenge
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Before contest
Codeforces Round 913 (Div. 3)
18:39:35
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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
1906J
Count BFS Graph
combinatorics
,
dp
x281
1906H
Twin Friends
combinatorics
,
dp
x277
1895F
Fancy Arrays
combinatorics
,
dp
,
math
,
matrices
2600
x483
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x111
1886D
Monocarp and the Set
combinatorics
,
data structures
,
math
2100
x2942
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x5705
1879C
Make it Alternating
combinatorics
,
dp
,
greedy
1300
x12721
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x708
1876B
Effects of Anti Pimples
combinatorics
,
number theory
,
sortings
1500
x6151
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x973
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x616
1866H
Happy Sets
combinatorics
2100
x1415
1866B
Battling with Numbers
combinatorics
,
math
,
number theory
1400
x6307
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x225
1863G
Swaps
combinatorics
,
dp
,
graphs
,
math
2800
x462
1862D
Ice Cream Balls
binary search
,
combinatorics
,
constructive algorithms
,
math
1300
x14491
1861E
Non-Intersecting Subpermutations
combinatorics
,
dp
,
implementation
,
math
2300
x1458
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x3633
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x20811
1854C
Expected Destruction
combinatorics
,
dp
,
math
,
probabilities
2500
x1274
1850G
The Morning Star
combinatorics
,
data structures
,
geometry
,
implementation
,
math
,
sortings
1500
x9656
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1326
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x297
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x101
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x15618
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x28330
1842G
Tenzing and Random Operations
combinatorics
,
dp
,
math
,
probabilities
2800
x722
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x21508
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x20023
1838E
Count Supersequences
combinatorics
,
dp
,
math
2500
x1228
1837E
Playoff Fixing
combinatorics
,
trees
2200
x1951
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x174
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x5894
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x1923
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1377
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x6154
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x15879
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2329
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4003
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x15119
1821F
Timber
combinatorics
,
dp
,
fft
,
math
2600
x633
1821A
Matching
combinatorics
,
math
800
x18372
1817C
Similar Polynomials
combinatorics
,
math
2400
x859
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x904
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1447
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x1725
1810H
Last Number
combinatorics
,
math
2900
x112
1809G
Prediction
combinatorics
,
dp
,
math
2800
x357
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x361
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x573
1808E1
Minibuses on Venus (easy version)
combinatorics
,
divide and conquer
,
dp
2200
x1129
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x782
1799G
Count Voting
combinatorics
,
dp
,
math
2600
x619
1795D
Triangle Coloring
combinatorics
,
math
1600
x7770
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3096
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x342
1792F1
Graph Coloring (easy version)
combinatorics
,
dp
,
graphs
2700
x605
1789C
Serval and Toxel's Arrays
combinatorics
,
dp
,
implementation
,
math
1500
x7449
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3488
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3094
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x271
1784D
Wooden Spoon
combinatorics
,
dp
2400
x904
1781F
Bracket Insertion
combinatorics
,
dp
,
math
,
trees
2700
x668
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1261
1778D
Flexible String Revisit
combinatorics
,
dp
,
math
,
probabilities
2100
x2353
1777D
Score of a Tree
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
math
,
probabilities
,
trees
1900
x2940
1777B
Emordnilap
combinatorics
,
greedy
,
math
900
x15972
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1810
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x295
1773G
Game of Questions
bitmasks
,
combinatorics
,
dp
,
fft
,
math
,
probabilities
2800
x276
1773D
Dominoes
combinatorics
,
flows
,
graph matchings
,
greedy
2600
x378
1771A
Hossam and Combinatorics
combinatorics
,
math
,
sortings
900
x20966
1770F
Koxia and Sequence
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
3100
x530
1770E
Koxia and Tree
combinatorics
,
dfs and similar
,
dp
,
dsu
,
math
,
probabilities
,
trees
2400
x1224
1768E
Partial Sorting
combinatorics
,
math
,
number theory
2300
x1672
1767D
Playoff
combinatorics
,
constructive algorithms
,
dp
,
greedy
,
math
1500
x8790
1765C
Card Guessing
combinatorics
,
dp
,
probabilities
2600
x323
1764D
Doremy's Pegging Game
combinatorics
,
dp
,
math
2000
x2492
1763D
Valid Bitonic Permutations
combinatorics
,
dp
,
implementation
,
math
,
number theory
2200
x1869
1762E
Tree Sum
combinatorics
,
math
,
trees
2600
x536
1762C
Binary Strings are Fun
combinatorics
,
math
1400
x8327
1761F2
Anti-median (Hard Version)
combinatorics
,
dp
,
math
3500
x69
1761D
Carry Bit
combinatorics
,
math
2100
x2172
1758E
Tick, Tock
combinatorics
,
dfs and similar
,
dsu
,
graphs
2500
x735
1750G
Doping
combinatorics
,
dp
,
math
3300
x198
1750F
Majority
combinatorics
,
dp
,
math
,
strings
2700
x688
1750D
Count GCD
combinatorics
,
math
,
number theory
1800
x5111
1749D
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
1900
x4944
1748D
ConstructOR
bitmasks
,
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
math
,
number theory
2100
x2519
1747E
List Generation
combinatorics
,
dp
,
math
2900
x456
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x227
1743A
Password
brute force
,
combinatorics
,
implementation
,
math
800
x25264
1740F
Conditional Mix
combinatorics
,
dp
,
math
2600
x700
1739C
Card Game
combinatorics
,
constructive algorithms
,
dp
,
games
1500
x8245
1738E
Balance Addicts
combinatorics
,
dp
,
math
,
two pointers
2300
x1391
1737E
Ela Goes Hiking
combinatorics
,
dp
,
math
,
probabilities
2500
x867
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5023
1732A
Bestie
brute force
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x13787
1731F
Function Sum
brute force
,
combinatorics
,
dp
,
fft
,
math
2500
x618
1730E
Maximums and Minimums
combinatorics
,
data structures
,
divide and conquer
,
number theory
2700
x556
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