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Before contest
Codeforces Round 941 (Div. 1)
08:48:51
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Before contest
Codeforces Round 941 (Div. 2)
08:48:51
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number theory
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
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combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
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dsu
expression parsing
fft
flows
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graph matchings
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implementation
interactive
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Problems
#
Name
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x76
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x85
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x104
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x132
1707F
Bugaboo
bitmasks
,
constructive algorithms
,
dp
,
number theory
3500
x144
1054H
Epic Convolution
chinese remainder theorem
,
fft
,
math
,
number theory
3500
x171
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x182
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x212
1264F
Beautiful Fibonacci Problem
constructive algorithms
,
number theory
3500
x833
1310F
Bad Cryptography
math
,
number theory
3400
x67
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x77
1190F
Tokitsukaze and Powers
number theory
,
probabilities
3400
x87
756F
Long number
expression parsing
,
math
,
number theory
3400
x89
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x137
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x184
1098E
Fedya the Potter
binary search
,
implementation
,
math
,
number theory
3400
x211
1103E
Radix sum
fft
,
math
,
number theory
3400
x214
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x489
1737F
Ela and Prime GCD
constructive algorithms
,
math
,
number theory
3300
x117
1718F
Burenka, an Array and Queries
data structures
,
math
,
number theory
3300
x145
1548D2
Gregor and the Odd Cows (Hard)
brute force
,
geometry
,
math
,
number theory
3300
x237
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x314
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x316
986F
Oppa Funcan Style Remastered
graphs
,
math
,
number theory
,
shortest paths
3300
x564
582D
Number of Binominal Coefficients
dp
,
math
,
number theory
3300
x605
765G
Math, math everywhere
brute force
,
dp
,
math
,
meet-in-the-middle
,
number theory
3200
x79
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x110
500G
New Year Running
number theory
,
trees
3200
x155
1091G
New Year and the Factorisation Collaboration
interactive
,
math
,
number theory
3200
x189
913G
Power Substring
math
,
number theory
3200
x192
1223G
Wooden Raft
binary search
,
math
,
number theory
3200
x226
1656H
Equal LCM Subsets
data structures
,
math
,
number theory
3200
x395
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x855
1184A3
Heidi Learns Hashing (Hard)
fft
,
math
,
number theory
3100
x136
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x323
516E
Drazil and His Happy Friends
math
,
number theory
3100
x471
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x513
1225G
To Make 1
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
3100
x521
1770F
Koxia and Sequence
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
3100
x601
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x714
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1783
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x154
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x175
346E
Doodle Jump
math
,
number theory
3000
x249
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x353
698F
Coprime Permutation
combinatorics
,
number theory
3000
x428
1603D
Artistic Partition
divide and conquer
,
dp
,
number theory
3000
x609
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x637
1906G
Grid Game 2
games
,
number theory
2900
x144
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x167
819C
Mister B and Beacons on Field
number theory
2900
x204
819D
Mister B and Astronomers
number theory
2900
x214
449E
Jzzhu and Squares
dp
,
math
,
number theory
2900
x281
1698G
Long Binary String
bitmasks
,
math
,
matrices
,
meet-in-the-middle
,
number theory
2900
x300
1644F
Basis
combinatorics
,
fft
,
math
,
number theory
2900
x310
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x328
717A
Festival Organization
combinatorics
,
math
,
number theory
2900
x332
1030G
Linear Congruential Generator
number theory
2900
x348
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x373
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x420
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x443
896D
Nephren Runs a Cinema
chinese remainder theorem
,
combinatorics
,
math
,
number theory
2900
x516
1622F
Quadratic Set
constructive algorithms
,
hashing
,
math
,
number theory
2900
x585
1198F
GCD Groups 2
greedy
,
number theory
,
probabilities
2900
x815
585E
Present for Vitalik the Philatelist
combinatorics
,
math
,
number theory
2900
x1041
1285F
Classical?
binary search
,
combinatorics
,
number theory
2900
x1061
338D
GCD Table
chinese remainder theorem
,
math
,
number theory
2900
x1090
1845F
Swimmers in the Pool
dp
,
fft
,
math
,
number theory
2800
x350
1732E
Location
data structures
,
dp
,
math
,
number theory
2800
x406
722F
Cyclic Cipher
chinese remainder theorem
,
data structures
,
implementation
,
number theory
,
two pointers
2800
x469
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x470
1436F
Sum Over Subsets
combinatorics
,
math
,
number theory
2800
x491
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x576
671C
Ultimate Weirdness of an Array
data structures
,
number theory
2800
x662
986E
Prince's Problem
brute force
,
data structures
,
math
,
number theory
,
trees
2800
x698
1626F
A Random Code Problem
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2800
x701
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x712
1208G
Polygons
greedy
,
math
,
number theory
2800
x720
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x982
774F
Pens And Days Of Week
*special problem
,
binary search
,
number theory
2700
x104
774G
Perfectionist Arkadiy
*special problem
,
number theory
2700
x173
1016G
Appropriate Team
bitmasks
,
math
,
number theory
2700
x253
1468L
Prime Divisors Selection
binary search
,
greedy
,
math
,
number theory
2700
x312
1182F
Maximum Sine
binary search
,
data structures
,
number theory
2700
x329
1109E
Sasha and a Very Easy Test
data structures
,
number theory
2700
x492
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x544
870F
Paths
data structures
,
number theory
2700
x593
1730E
Maximums and Minimums
combinatorics
,
data structures
,
divide and conquer
,
number theory
2700
x609
995E
Number Clicker
divide and conquer
,
graphs
,
meet-in-the-middle
,
number theory
2700
x612
1292D
Chaotic V.
dp
,
graphs
,
greedy
,
math
,
number theory
,
trees
2700
x771
838D
Airplane Arrangements
math
,
number theory
2700
x807
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x829
1034C
Region Separation
combinatorics
,
dp
,
number theory
,
trees
2700
x844
1515G
Phoenix and Odometers
dfs and similar
,
graphs
,
math
,
number theory
2700
x929
1422F
Boring Queries
data structures
,
math
,
number theory
2700
x961
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x970
961G
Partitions
combinatorics
,
math
,
number theory
2700
x1283
906D
Power Tower
chinese remainder theorem
,
math
,
number theory
2700
x1965
303D
Rotatable Number
math
,
number theory
2600
x278
1027G
X-mouse in the Campus
bitmasks
,
math
,
number theory
2600
x293
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