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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
45:28:17
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Difficulty:
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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
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Status
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Custom test
Problems
#
Name
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x121
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x31
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x169
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x78
1939D
Big Persimmon
*special problem
,
dp
,
games
x58
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x269
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x205
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x14
1910J
Two Colors
*special problem
2900
x41
1910I
Inverse Problem
*special problem
,
combinatorics
,
dp
2700
x39
1910H
Sum of Digits of Sums
*special problem
,
binary search
,
data structures
2400
x77
1910G
Pool Records
*special problem
,
greedy
2700
x49
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x153
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x166
1910D
Remove and Add
*special problem
,
greedy
1800
x295
1910C
Poisonous Swamp
*special problem
,
*special problem
,
implementation
,
implementation
1600
x558
1910B
Security Guard
*special problem
,
greedy
1600
x573
1910A
Username
*special problem
,
implementation
1100
x1524
1885A
Deterministic Scheduling for Extended Reality over 5G and Beyond
*special problem
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5777
1812I
Mountain Climber
*special problem
x249
1812H
Expected Twist
*special problem
,
interactive
x129
1812G
Colour Vision
*special problem
,
implementation
x520
1812F
Factorization
*special problem
,
number theory
x949
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x3930
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4325
1812C
Digits
*special problem
x1218
1812B
Was it Rated?
*special problem
,
*special problem
,
*special problem
,
brute force
,
implementation
x5551
1812A
Are You a Robot?
*special problem
,
*special problem
,
*special problem
,
expression parsing
,
strings
x13028
1769D3
Игра в Девятку III
*special problem
,
brute force
2300
x115
1769D2
Игра в Девятку II
*special problem
,
brute force
2200
x186
1769D1
Игра в Девятку I
*special problem
,
brute force
,
dp
1800
x365
1769C2
Подкрутка II
*special problem
,
dp
1300
x907
1769C1
Подкрутка I
*special problem
,
brute force
,
dp
,
greedy
1200
x926
1769B2
Копирование файлов II
*special problem
,
binary search
,
brute force
,
math
1400
x853
1769B1
Копирование файлов I
*special problem
,
brute force
,
implementation
,
math
1000
x1307
1769A
Узкая дорога
*special problem
,
math
800
x1891
1663H
Cross-Language Program
*special problem
,
constructive algorithms
x1256
1663G
Six Characters
*special problem
,
constructive algorithms
,
strings
x203
1663F
In Every Generation...
*special problem
,
strings
x327
1663E
Are You Safe?
*special problem
,
implementation
x537
1663D
Is it rated - 3
*special problem
,
combinatorics
,
dp
,
math
x1378
1663C
Pōja Verdon
*special problem
,
implementation
,
math
x5606
1663B
Mike's Sequence
*special problem
,
divide and conquer
,
implementation
,
math
x3343
1663A
Who Tested?
*special problem
,
expression parsing
,
trees
x10377
1576A
Communication Routing Challenge
*special problem
1571J
Two Railroads
*special problem
3000
x36
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x54
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x44
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x71
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x175
1571E
Fix the String
*special problem
,
bitmasks
,
dp
,
greedy
1700
x319
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x316
1571C
Rhyme
*special problem
,
implementation
1800
x357
1571B
Epic Novel
*special problem
,
math
1300
x673
1571A
Sequence of Comparisons
*special problem
800
x1235
1533J
Pawns
*special problem
x41
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x47
1533H
Submatrices
*special problem
,
bitmasks
,
data structures
,
dp
x80
1533G
Biome Map
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
x86
1533F
Binary String Partition
*special problem
,
binary search
,
greedy
x208
1533E
Chess Team Forming
*special problem
,
binary search
,
data structures
,
greedy
x268
1533D
String Searching
*special problem
,
hashing
x434
1533C
Sweets
*special problem
,
data structures
,
implementation
x456
1533B
Nearest Point Function
*special problem
,
implementation
x749
1533A
Travel to Bertown
*special problem
,
implementation
,
math
x990
1532F
Prefixes and Suffixes
*special problem
,
strings
x213
1532E
Good Array
*special problem
x383
1532D
Teams Forming
*special problem
,
sortings
x578
1532C
Uniform String
*special problem
,
implementation
x633
1532B
Frog Jumping
*special problem
,
math
x816
1532A
A+B (Trial Problem)
*special problem
x1128
1531E3
Сортировка слиянием
*special problem
,
binary search
x267
1531E2
Сортировка слиянием
*special problem
,
*special problem
,
brute force
x331
1531E1
Сортировка слиянием
*special problem
x356
1531D
Редактируем Зингер | color
*special problem
,
*special problem
x351
1531C
Симметричный амфитеатр
*special problem
,
constructive algorithms
,
dp
x644
1531B2
Мониторинг
*special problem
x764
1531B1
Мониторинг
*special problem
,
*special problem
x1087
1531A
Зингер | color
*special problem
,
implementation
x1443
1505I
Mysterious language again, seriously?
*special problem
2200
x537
1505H
L BREAK into program
*special problem
2500
x480
1505G
Encoded message
*special problem
,
implementation
2600
x290
1505F
Math
*special problem
,
math
2200
x1471
1505E
Cakewalk
*special problem
,
greedy
,
implementation
,
shortest paths
1800
x1719
1505D
Xenolith? Hippodrome?
*special problem
,
number theory
1800
x739
1505C
Fibonacci Words
*special problem
,
implementation
1400
x6286
1505B
DMCA
*special problem
,
implementation
,
number theory
1600
x5982
1505A
Is it rated - 2
*special problem
,
implementation
,
interactive
900
x13948
1488J
Flower Shop
*special problem
,
data structures
,
fft
,
math
3100
x31
1488I
Demonic Invasion
*special problem
,
flows
3100
x33
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x52
1488G
Painting Numbers
*special problem
,
data structures
,
greedy
,
number theory
2500
x116
1488F
Dogecoin
*special problem
,
*special problem
,
binary search
,
data structures
2300
x167
1488E
Palindromic Doubles
*special problem
,
data structures
,
dp
2200
x194
1488D
Problemsolving Marathon
*special problem
,
binary search
,
greedy
1900
x316
1488C
Two Policemen
*special problem
,
binary search
,
brute force
,
math
1900
x397
1488B
RBS Deletion
*special problem
,
greedy
1800
x523
1488A
From Zero To Y
*special problem
,
math
900
x1330
1431J
Zero-XOR Array
*special problem
,
dp
3400
x41
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