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Before contest
Codeforces Round 941 (Div. 1)
07:25:11
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
07:25:11
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number theory
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
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probabilities
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ternary search
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Problems
#
Name
703E
Mishka and Divisors
dp
,
number theory
2600
x585
364C
Beautiful Set
brute force
,
number theory
2300
x580
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x576
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x576
1257G
Divisor Set
divide and conquer
,
fft
,
greedy
,
math
,
number theory
2600
x573
986F
Oppa Funcan Style Remastered
graphs
,
math
,
number theory
,
shortest paths
3300
x564
1582G
Kuzya and Homework
data structures
,
number theory
2600
x560
963C
Cutting Rectangle
brute force
,
math
,
number theory
2600
x558
293C
Cube Problem
brute force
,
math
,
number theory
2400
x551
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x544
216E
Martian Luck
math
,
number theory
2000
x543
852F
Product transformation
combinatorics
,
math
,
number theory
2200
x542
215E
Periodical Numbers
combinatorics
,
dp
,
number theory
2100
x538
1225G
To Make 1
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
3100
x521
283D
Cows and Cool Sequences
dp
,
math
,
number theory
2400
x519
896D
Nephren Runs a Cinema
chinese remainder theorem
,
combinatorics
,
math
,
number theory
2900
x516
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x513
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x495
1109E
Sasha and a Very Easy Test
data structures
,
number theory
2700
x492
1436F
Sum Over Subsets
combinatorics
,
math
,
number theory
2800
x491
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x489
1045B
Space Isaac
hashing
,
number theory
2400
x488
271E
Three Horses
constructive algorithms
,
math
,
number theory
2200
x478
516E
Drazil and His Happy Friends
math
,
number theory
3100
x471
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x470
722F
Cyclic Cipher
chinese remainder theorem
,
data structures
,
implementation
,
number theory
,
two pointers
2800
x469
1798F
Gifts from Grandfather Ahmed
dp
,
math
,
number theory
2500
x467
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x462
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x443
306C
White, Black and White Again
combinatorics
,
number theory
2100
x435
93E
Lostborn
dp
,
math
,
number theory
2600
x433
1725E
Electrical Efficiency
combinatorics
,
data structures
,
dp
,
math
,
number theory
,
trees
2500
x432
698F
Coprime Permutation
combinatorics
,
number theory
3000
x428
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x420
1732E
Location
data structures
,
dp
,
math
,
number theory
2800
x406
1656H
Equal LCM Subsets
data structures
,
math
,
number theory
3200
x395
360D
Levko and Sets
number theory
2600
x384
185D
Visit of the Great
math
,
number theory
2600
x378
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x373
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x373
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x353
1845F
Swimmers in the Pool
dp
,
fft
,
math
,
number theory
2800
x350
1030G
Linear Congruential Generator
number theory
2900
x348
717A
Festival Organization
combinatorics
,
math
,
number theory
2900
x332
200E
Tractor College
implementation
,
math
,
number theory
,
ternary search
2400
x332
1182F
Maximum Sine
binary search
,
data structures
,
number theory
2700
x329
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x328
180B
Divisibility Rules
math
,
number theory
2300
x325
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x323
73E
Morrowindows
math
,
number theory
2400
x322
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x316
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x314
1468L
Prime Divisors Selection
binary search
,
greedy
,
math
,
number theory
2700
x312
1644F
Basis
combinatorics
,
fft
,
math
,
number theory
2900
x310
1698G
Long Binary String
bitmasks
,
math
,
matrices
,
meet-in-the-middle
,
number theory
2900
x300
294D
Shaass and Painter Robot
brute force
,
implementation
,
number theory
2500
x298
1027G
X-mouse in the Campus
bitmasks
,
math
,
number theory
2600
x293
449E
Jzzhu and Squares
dp
,
math
,
number theory
2900
x281
303D
Rotatable Number
math
,
number theory
2600
x278
1016G
Appropriate Team
bitmasks
,
math
,
number theory
2700
x253
346E
Doodle Jump
math
,
number theory
3000
x249
1548D2
Gregor and the Odd Cows (Hard)
brute force
,
geometry
,
math
,
number theory
3300
x237
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x234
1223G
Wooden Raft
binary search
,
math
,
number theory
3200
x226
1103E
Radix sum
fft
,
math
,
number theory
3400
x214
819D
Mister B and Astronomers
number theory
2900
x214
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x212
1098E
Fedya the Potter
binary search
,
implementation
,
math
,
number theory
3400
x211
774E
Big Number and Remainder
*special problem
,
math
,
number theory
2300
x206
819C
Mister B and Beacons on Field
number theory
2900
x204
913G
Power Substring
math
,
number theory
3200
x192
1091G
New Year and the Factorisation Collaboration
interactive
,
math
,
number theory
3200
x189
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x184
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x182
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x175
774G
Perfectionist Arkadiy
*special problem
,
number theory
2700
x173
1054H
Epic Convolution
chinese remainder theorem
,
fft
,
math
,
number theory
3500
x171
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x167
500G
New Year Running
number theory
,
trees
3200
x155
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x154
1718F
Burenka, an Array and Queries
data structures
,
math
,
number theory
3300
x145
1906G
Grid Game 2
games
,
number theory
2900
x144
1707F
Bugaboo
bitmasks
,
constructive algorithms
,
dp
,
number theory
3500
x144
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x137
1184A3
Heidi Learns Hashing (Hard)
fft
,
math
,
number theory
3100
x136
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x132
1346G
Two IP Cameras
*special problem
,
math
,
number theory
2300
x130
1737F
Ela and Prime GCD
constructive algorithms
,
math
,
number theory
3300
x117
1488G
Painting Numbers
*special problem
,
data structures
,
greedy
,
number theory
2500
x117
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x110
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x104
774F
Pens And Days Of Week
*special problem
,
binary search
,
number theory
2700
x104
756F
Long number
expression parsing
,
math
,
number theory
3400
x89
1190F
Tokitsukaze and Powers
number theory
,
probabilities
3400
x87
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x85
765G
Math, math everywhere
brute force
,
dp
,
math
,
meet-in-the-middle
,
number theory
3200
x79
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x77
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x76
1310F
Bad Cryptography
math
,
number theory
3400
x67
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