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Before contest
Educational Codeforces Round 131 (Rated for Div. 2)
30:23:12
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Difficulty:
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number theory
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
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x61
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x94
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x94
1054H
Epic Convolution
chinese remainder theorem
,
fft
,
math
,
number theory
3500
x133
1264F
Beautiful Fibonacci Problem
constructive algorithms
,
number theory
3500
x266
1310F
Bad Cryptography
math
,
number theory
3400
x47
756F
Long number
expression parsing
,
math
,
number theory
3400
x71
1190F
Tokitsukaze and Powers
number theory
,
probabilities
3400
x72
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x108
1098E
Fedya the Potter
binary search
,
implementation
,
math
,
number theory
3400
x129
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x139
1103E
Radix sum
fft
,
math
,
number theory
3400
x174
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x198
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x183
1548D2
Gregor and the Odd Cows (Hard)
brute force
,
geometry
,
math
,
number theory
3300
x197
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x199
986F
Oppa Funcan Style Remastered
graphs
,
math
,
number theory
,
shortest paths
3300
x280
582D
Number of Binominal Coefficients
dp
,
math
,
number theory
3300
x398
765G
Math, math everywhere
brute force
,
dp
,
math
,
meet-in-the-middle
,
number theory
3200
x42
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x74
500G
New Year Running
number theory
,
trees
3200
x92
1091G
New Year and the Factorisation Collaboration
interactive
,
math
,
number theory
3200
x144
913G
Power Substring
math
,
number theory
3200
x161
1223G
Wooden Raft
binary search
,
math
,
number theory
3200
x164
1656H
Equal LCM Subsets
data structures
,
math
,
number theory
3200
x198
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x557
1184A3
Heidi Learns Hashing (Hard)
fft
,
math
,
number theory
3100
x94
1225G
To Make 1
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
3100
x269
516E
Drazil and His Happy Friends
math
,
number theory
3100
x330
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x359
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x523
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1358
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x106
346E
Doodle Jump
math
,
number theory
3000
x190
698F
Coprime Permutation
combinatorics
,
number theory
3000
x254
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x258
1603D
Artistic Partition
divide and conquer
,
dp
,
number theory
3000
x344
1698G
Long Binary String
bitmasks
,
math
,
matrices
,
meet-in-the-middle
,
number theory
2900
x100
819D
Mister B and Astronomers
number theory
2900
x158
819C
Mister B and Beacons on Field
number theory
2900
x183
717A
Festival Organization
math
,
number theory
2900
x220
449E
Jzzhu and Squares
dp
,
math
,
number theory
2900
x229
1644F
Basis
combinatorics
,
fft
,
math
,
number theory
2900
x231
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x234
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x279
1030G
Linear Congruential Generator
number theory
2900
x299
896D
Nephren Runs a Cinema
chinese remainder theorem
,
combinatorics
,
math
,
number theory
2900
x301
1622F
Quadratic Set
constructive algorithms
,
hashing
,
math
,
number theory
2900
x364
1198F
GCD Groups 2
greedy
,
number theory
,
probabilities
2900
x503
1285F
Classical?
binary search
,
combinatorics
,
number theory
2900
x717
585E
Present for Vitalik the Philatelist
combinatorics
,
math
,
number theory
2900
x781
338D
GCD Table
chinese remainder theorem
,
math
,
number theory
2900
x837
722F
Cyclic Cipher
chinese remainder theorem
,
data structures
,
implementation
,
number theory
,
two pointers
2800
x355
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x363
1436F
Sum Over Subsets
combinatorics
,
math
,
number theory
2800
x382
1626F
A Random Code Problem
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2800
x424
986E
Prince's Problem
brute force
,
data structures
,
math
,
number theory
,
trees
2800
x542
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x547
1208G
Polygons
greedy
,
math
,
number theory
2800
x572
671C
Ultimate Weirdness of an Array
data structures
,
number theory
2800
x576
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x722
774F
Pens And Days Of Week
*special problem
,
binary search
,
number theory
2700
x88
774G
Perfectionist Arkadiy
*special problem
,
number theory
2700
x117
1016G
Appropriate Team
bitmasks
,
math
,
number theory
2700
x208
1468L
Prime Divisors Selection
binary search
,
greedy
,
math
,
number theory
2700
x249
1182F
Maximum Sine
binary search
,
data structures
,
number theory
2700
x255
838D
Airplane Arrangements
math
,
number theory
2700
x360
1109E
Sasha and a Very Easy Test
data structures
,
number theory
2700
x368
870F
Paths
data structures
,
number theory
2700
x405
995E
Number Clicker
divide and conquer
,
graphs
,
meet-in-the-middle
,
number theory
2700
x458
1034C
Region Separation
combinatorics
,
dp
,
number theory
,
trees
2700
x561
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x602
1422F
Boring Queries
data structures
,
math
,
number theory
2700
x613
1292D
Chaotic V.
dp
,
graphs
,
greedy
,
math
,
number theory
,
trees
2700
x643
1515G
Phoenix and Odometers
dfs and similar
,
graphs
,
math
,
number theory
2700
x661
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x777
961G
Partitions
combinatorics
,
math
,
number theory
2700
x920
906D
Power Tower
chinese remainder theorem
,
math
,
number theory
2700
x1250
1027G
X-mouse in the Campus
bitmasks
,
math
,
number theory
2600
x241
303D
Rotatable Number
math
,
number theory
2600
x244
185D
Visit of the Great
math
,
number theory
2600
x288
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x297
360D
Levko and Sets
number theory
2600
x338
93E
Lostborn
dp
,
math
,
number theory
2600
x343
1699E
Three Days Grace
dp
,
greedy
,
math
,
number theory
,
two pointers
2600
x366
1582G
Kuzya and Homework
data structures
,
number theory
2600
x398
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x432
1257G
Divisor Set
divide and conquer
,
fft
,
greedy
,
math
,
number theory
2600
x455
963C
Cutting Rectangle
brute force
,
math
,
number theory
2600
x476
703E
Mishka and Divisors
dp
,
number theory
2600
x505
982E
Billiard
geometry
,
number theory
2600
x523
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x572
1398G
Running Competition
bitmasks
,
fft
,
math
,
number theory
2600
x583
1355F
Guess Divisors Count
constructive algorithms
,
interactive
,
number theory
2600
x618
763C
Timofey and remoduling
brute force
,
implementation
,
math
,
number theory
2600
x627
724G
Xor-matic Number of the Graph
bitmasks
,
graphs
,
math
,
number theory
,
trees
2600
x734
1554E
You
dfs and similar
,
dp
,
math
,
number theory
2600
x936
1278F
Cards
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2600
x1094
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1238
1325E
Ehab's REAL Number Theory Problem
brute force
,
dfs and similar
,
graphs
,
number theory
,
shortest paths
2600
x1488
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