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Before contest
Codeforces Round 941 (Div. 1)
46:32:04
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Before contest
Codeforces Round 941 (Div. 2)
46:32:03
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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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number theory
probabilities
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shortest paths
sortings
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strings
ternary search
trees
two pointers
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Problems
#
Name
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2156
1583A
Windblume Ode
math
,
number theory
800
x13526
1582G
Kuzya and Homework
data structures
,
number theory
2600
x560
1581A
CQXYM Count Permutations
combinatorics
,
math
,
number theory
800
x13236
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x4560
1575G
GCD Festival
math
,
number theory
2200
x639
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x153
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x110
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x373
1562B
Scenes From a Memory
brute force
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x19148
1561D1
Up the Strip (simplified version)
brute force
,
data structures
,
dp
,
math
,
number theory
1700
x5378
1559E
Mocha and Stars
combinatorics
,
dp
,
fft
,
math
,
number theory
2200
x2211
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4595
1554E
You
dfs and similar
,
dp
,
math
,
number theory
2600
x1176
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x970
1553A
Digits Sum
math
,
number theory
800
x30052
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x316
1549A
Gregor and Cryptography
math
,
number theory
800
x31252
1548D2
Gregor and the Odd Cows (Hard)
brute force
,
geometry
,
math
,
number theory
3300
x237
1548D1
Gregor and the Odd Cows (Easy)
bitmasks
,
geometry
,
math
,
number theory
2300
x1426
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x9249
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5480
1543A
Exciting Bets
greedy
,
math
,
number theory
900
x26268
1542C
Strange Function
math
,
number theory
1600
x13478
1542B
Plus and Multiply
constructive algorithms
,
math
,
number theory
1500
x21981
1541B
Pleasant Pairs
brute force
,
implementation
,
math
,
number theory
1200
x26368
1538F
Interesting Function
binary search
,
dp
,
math
,
number theory
1500
x18276
1538D
Another Problem About Dividing Numbers
constructive algorithms
,
math
,
number theory
1700
x13009
1537D
Deleting Divisors
games
,
math
,
number theory
1700
x11816
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x13514
1535B
Array Reodering
brute force
,
greedy
,
math
,
number theory
,
sortings
900
x29512
1526B
I Hate 1111
dp
,
math
,
number theory
1400
x28532
1525A
Potion-making
math
,
number theory
800
x25038
1521B
Nastia and a Good Array
constructive algorithms
,
math
,
number theory
1300
x20708
1521A
Nastia and Nearly Good Numbers
constructive algorithms
,
math
,
number theory
1000
x35211
1520B
Ordinary Numbers
brute force
,
math
,
number theory
800
x42673
1519C
Berland Regional
brute force
,
data structures
,
greedy
,
number theory
,
sortings
1400
x15914
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4077
1515G
Phoenix and Odometers
dfs and similar
,
graphs
,
math
,
number theory
2700
x929
1515B
Phoenix and Puzzle
brute force
,
geometry
,
math
,
number theory
1000
x24077
1514C
Product 1 Modulo N
greedy
,
number theory
1600
x14211
1514A
Perfectly Imperfect Array
math
,
number theory
800
x23766
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x5016
1512G
Short Task
brute force
,
dp
,
math
,
number theory
1700
x7777
1511B
GCD Length
constructive algorithms
,
math
,
number theory
1100
x21920
1510D
Digits
dp
,
math
,
number theory
2100
x1791
1505D
Xenolith? Hippodrome?
*special problem
,
number theory
1800
x739
1505B
DMCA
*special problem
,
implementation
,
number theory
1600
x5993
1500B
Two chandeliers
binary search
,
brute force
,
chinese remainder theorem
,
math
,
number theory
2200
x1983
1499D
The Number of Pairs
dp
,
math
,
number theory
2100
x5437
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1557
1497E1
Square-Free Division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x8019
1497D
Genius
bitmasks
,
dp
,
graphs
,
number theory
2500
x1480
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x373
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4731
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2041
1488G
Painting Numbers
*special problem
,
data structures
,
greedy
,
number theory
2500
x117
1487D
Pythagorean Triples
binary search
,
brute force
,
math
,
number theory
1500
x16940
1487B
Cat Cycle
math
,
number theory
1200
x19573
1485D
Multiples and Power Differences
constructive algorithms
,
graphs
,
math
,
number theory
2200
x4929
1485C
Floor and Mod
binary search
,
brute force
,
math
,
number theory
1700
x9504
1485A
Add and Divide
brute force
,
greedy
,
math
,
number theory
1000
x20733
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x181
1477A
Nezzar and Board
constructive algorithms
,
math
,
number theory
1800
x5654
1475G
Strange Beauty
dp
,
math
,
number theory
,
sortings
1900
x6383
1475A
Odd Divisor
math
,
number theory
900
x54822
1474B
Different Divisors
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1000
x26219
1473B
String LCM
brute force
,
math
,
number theory
,
strings
1000
x29582
1471A
Strange Partition
greedy
,
math
,
number theory
900
x24407
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6138
1469D
Ceil Divisions
brute force
,
constructive algorithms
,
math
,
number theory
1700
x9126
1468L
Prime Divisors Selection
binary search
,
greedy
,
math
,
number theory
2700
x310
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3583
1462D
Add to Neighbour and Remove
greedy
,
math
,
number theory
1400
x16185
1458A
Row GCD
math
,
number theory
1600
x15904
1455A
Strange Functions
math
,
number theory
800
x25981
1454D
Number into Sequence
constructive algorithms
,
math
,
number theory
1300
x19682
1444A
Division
brute force
,
math
,
number theory
1500
x12526
1436F
Sum Over Subsets
combinatorics
,
math
,
number theory
2800
x490
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1258
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4648
1422F
Boring Queries
data structures
,
math
,
number theory
2700
x961
1419E
Decryption
constructive algorithms
,
implementation
,
math
,
number theory
2100
x3137
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x352
1411B
Fair Numbers
brute force
,
number theory
1000
x17700
1409C
Yet Another Array Restoration
brute force
,
math
,
number theory
1200
x22707
1407B
Big Vova
brute force
,
greedy
,
math
,
number theory
1300
x16662
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1541
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x982
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x8843
1401C
Mere Array
constructive algorithms
,
math
,
number theory
,
sortings
1300
x23387
1398G
Running Competition
bitmasks
,
fft
,
math
,
number theory
2600
x760
1397B
Power Sequence
brute force
,
math
,
number theory
,
sortings
1500
x14339
1396A
Multiples of Length
constructive algorithms
,
greedy
,
number theory
1600
x14933
1389E
Calendar Ambiguity
math
,
number theory
2200
x3106
1389A
LCM Problem
constructive algorithms
,
greedy
,
math
,
number theory
800
x38213
1388A
Captain Flint and Crew Recruitment
brute force
,
greedy
,
math
,
number theory
800
x24525
1379B
Dubious Cyrpto
binary search
,
brute force
,
math
,
number theory
1500
x12461
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x76
1372B
Omkar and Last Class of Math
greedy
,
math
,
number theory
1300
x26046
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