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Before contest
Codeforces Round 941 (Div. 1)
47:47:21
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Before contest
Codeforces Round 941 (Div. 2)
47:47:21
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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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sortings
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trees
two pointers
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#
Name
1725L
Lemper Cooking Competition
data structures
2400
x862
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x861
733E
Sleep in Class
constructive algorithms
,
data structures
,
math
,
two pointers
2400
x858
1620G
Subsequences Galore
bitmasks
,
combinatorics
,
dp
2400
x854
611E
New Year and Three Musketeers
data structures
,
greedy
,
sortings
2400
x854
303C
Minimum Modular
brute force
,
graphs
,
math
,
number theory
2400
x852
29E
Quarrel
graphs
,
shortest paths
2400
x850
581F
Zublicanes and Mumocrates
dp
,
trees
,
two pointers
2400
x844
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x842
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x838
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x832
1146E
Hot is Cold
bitmasks
,
data structures
,
divide and conquer
,
implementation
2400
x821
83D
Numbers
dp
,
math
,
number theory
2400
x816
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x812
1267A
Apprentice Learning Trajectory
2400
x812
865C
Gotta Go Fast
binary search
,
dp
2400
x809
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x807
755E
PolandBall and White-Red graph
constructive algorithms
,
graphs
,
shortest paths
2400
x807
983C
Elevator
dp
,
graphs
,
shortest paths
2400
x801
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x800
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x789
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x784
639D
Bear and Contribution
data structures
,
greedy
,
sortings
,
two pointers
2400
x778
1009G
Allowed Letters
bitmasks
,
flows
,
graph matchings
,
graphs
,
greedy
2400
x767
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x766
417E
Square Table
constructive algorithms
,
math
,
probabilities
2400
x766
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x756
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x749
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x745
1186F
Vus the Cossack and a Graph
dfs and similar
,
graphs
,
greedy
,
implementation
2400
x743
913E
Logical Expression
bitmasks
,
dp
,
shortest paths
2400
x743
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2400
x734
1423J
Bubble Cup hypothesis
bitmasks
,
constructive algorithms
,
dp
,
math
2400
x731
582C
Superior Periodic Subarrays
number theory
2400
x725
1147D
Palindrome XOR
dfs and similar
,
graphs
2400
x723
266D
BerDonalds
graphs
,
math
,
shortest paths
2400
x706
209C
Trails and Glades
constructive algorithms
,
dsu
,
graphs
,
greedy
2400
x690
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x685
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x684
920D
Tanks
dp
,
greedy
,
implementation
2400
x683
1061F
Lost Root
interactive
,
probabilities
2400
x682
288D
Polo the Penguin and Trees
combinatorics
,
dfs and similar
,
trees
2400
x671
1080F
Katya and Segments Sets
data structures
,
interactive
,
sortings
2400
x669
441E
Valera and Number
bitmasks
,
dp
,
math
,
probabilities
2400
x669
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x665
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x658
200A
Cinema
brute force
,
data structures
2400
x656
256E
Lucky Arrays
data structures
2400
x653
853D
Michael and Charging Stations
binary search
,
dp
,
greedy
2400
x652
1866L
Lihmuf Balling
binary search
,
brute force
,
math
2400
x650
1163E
Magical Permutation
bitmasks
,
brute force
,
constructive algorithms
,
data structures
,
graphs
,
math
2400
x644
161C
Abracadabra
divide and conquer
2400
x638
295D
Greg and Caves
combinatorics
,
dp
2400
x634
1938F
Forming Groups
2400
x626
513G2
Inversions problem
dp
,
probabilities
2400
x626
625D
Finals in arithmetic
constructive algorithms
,
implementation
,
math
2400
x623
796E
Exam Cheating
binary search
,
dp
2400
x621
717G
Underfail
flows
2400
x619
922F
Divisibility
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x616
758F
Geometrical Progression
brute force
,
math
,
number theory
2400
x616
367D
Sereja and Sets
bitmasks
,
dfs and similar
2400
x616
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x615
847J
Students Initiation
binary search
,
flows
,
graphs
2400
x612
979E
Kuro and Topological Parity
dp
2400
x587
1089M
Minegraphed
constructive algorithms
,
graphs
2400
x585
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x582
845E
Fire in the City
binary search
,
data structures
2400
x577
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x576
160E
Buses and People
binary search
,
data structures
,
sortings
2400
x576
633E
Startup Funding
binary search
,
constructive algorithms
,
data structures
,
probabilities
,
two pointers
2400
x567
323C
Two permutations
data structures
2400
x567
567F
Mausoleum
dp
2400
x561
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x559
883J
Renovation
constructive algorithms
,
greedy
,
sortings
2400
x556
293C
Cube Problem
brute force
,
math
,
number theory
2400
x551
1070I
Privatization of Roads in Berland
flows
,
graph matchings
,
graphs
2400
x532
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x528
380B
Sereja and Tree
graphs
,
implementation
2400
x527
316D3
PE Lesson
dp
,
math
2400
x526
1938K
Tree Quiz
2400
x524
856C
Eleventh Birthday
combinatorics
,
dp
,
math
2400
x522
542A
Place Your Ad Here
data structures
,
sortings
2400
x520
283D
Cows and Cool Sequences
dp
,
math
,
number theory
2400
x519
690A3
Collective Mindsets (hard)
2400
x514
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x494
1184E3
Daleks' Invasion (hard)
data structures
,
dsu
,
graphs
,
trees
2400
x492
1045B
Space Isaac
hashing
,
number theory
2400
x487
316G3
Good Substrings
string suffix structures
2400
x486
1090C
New Year Presents
constructive algorithms
,
data structures
2400
x478
1054E
Chips Puzzle
constructive algorithms
,
implementation
,
math
2400
x475
887D
Ratings and Reality Shows
data structures
,
two pointers
2400
x471
1070B
Berkomnadzor
data structures
,
greedy
2400
x468
1710E
Two Arrays
binary search
,
games
,
graph matchings
2400
x463
359E
Neatness
constructive algorithms
,
dfs and similar
2400
x458
354B
Game with Strings
bitmasks
,
dp
,
games
2400
x448
277C
Game
games
,
implementation
2400
x446
534F
Simplified Nonogram
bitmasks
,
dp
,
hashing
,
meet-in-the-middle
2400
x438
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x429
513D1
Constrained Tree
dfs and similar
2400
x425
717H
Pokermon League challenge
math
,
probabilities
2400
x417
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