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Before contest
Codeforces Round 964 (Div. 4)
01:50:24
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Difficulty:
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brute force
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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Custom test
Problems
#
Name
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x664
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x799
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1637
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x16032
1789A
Serval and Mocha's Array
brute force
,
math
,
number theory
800
x18343
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3833
1788A
One and Two
brute force
,
implementation
,
math
800
x29235
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x428
1786B
Cake Assembly Line
brute force
,
sortings
1300
x8846
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x315
1784A
Monsters (easy version)
brute force
,
greedy
1000
x14861
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x2070
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4320
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1293
1781D
Many Perfect Squares
brute force
,
math
,
number theory
1800
x5417
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7422
1781B
Going to the Cinema
brute force
,
greedy
,
sortings
1000
x13425
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1425
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1374
1780B
GCD Partition
brute force
,
greedy
,
math
,
number theory
1100
x17488
1779H
Olympic Team Building
brute force
,
meet-in-the-middle
3500
x137
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x8006
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x19519
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x434
1774F2
Magician and Pigs (Hard Version)
binary search
,
brute force
,
data structures
,
implementation
2700
x665
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1051
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7710
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x465
1772B
Matrix Rotation
brute force
,
implementation
800
x28826
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x678
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2681
1770C
Koxia and Number Theory
brute force
,
chinese remainder theorem
,
math
,
number theory
1700
x8446
1770A
Koxia and Whiteboards
brute force
,
greedy
1000
x23258
1769D3
Игра в Девятку III
*special problem
,
brute force
2300
x119
1769D2
Игра в Девятку II
*special problem
,
brute force
2200
x190
1769D1
Игра в Девятку I
*special problem
,
brute force
,
dp
1800
x375
1769C1
Подкрутка I
*special problem
,
brute force
,
dp
,
greedy
1200
x954
1769B2
Копирование файлов II
*special problem
,
binary search
,
brute force
,
math
1400
x865
1769B1
Копирование файлов I
*special problem
,
brute force
,
implementation
,
math
1000
x1332
1767E
Algebra Flash
bitmasks
,
brute force
,
dp
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x885
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1164
1766A
Extremely Round
brute force
,
implementation
800
x25450
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x579
1765E
Exchange
brute force
,
math
1000
x9871
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x944
1763C
Another Array Problem
brute force
,
constructive algorithms
,
greedy
2000
x6444
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x14420
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1792
1761A
Two Permutations
brute force
,
constructive algorithms
800
x18709
1759E
The Humanoid
brute force
,
dp
,
sortings
1500
x10560
1759D
Make It Round
brute force
,
number theory
1400
x13092
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x7152
1753F
Minecraft Series
brute force
,
two pointers
3500
x196
1753E
N Machines
binary search
,
brute force
,
greedy
3300
x324
1750B
Maximum Substring
brute force
,
greedy
,
implementation
800
x16165
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x10893
1748B
Diverse Substrings
brute force
,
implementation
,
strings
1400
x14845
1744E2
Divisible Numbers (hard version)
brute force
,
math
,
number theory
1900
x5498
1744E1
Divisible Numbers (easy version)
brute force
,
math
,
number theory
1500
x10671
1743D
Problem with Random Tests
brute force
,
dp
,
greedy
,
probabilities
1700
x7513
1743A
Password
brute force
,
combinatorics
,
implementation
,
math
800
x26542
1742G
Orray
bitmasks
,
brute force
,
greedy
,
math
,
sortings
1500
x10422
1742D
Coprime
brute force
,
greedy
,
number theory
1100
x22927
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1467
1741C
Minimize the Thickness
brute force
,
greedy
,
math
,
two pointers
1100
x17570
1737D
Ela and the Wiring Wizard
brute force
,
dp
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x1830
1736A
Make A Equal to B
brute force
,
greedy
,
sortings
800
x22643
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5421
1734A
Select Three Sticks
brute force
,
greedy
,
sortings
800
x20980
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1384
1732D1
Balance (Easy version)
brute force
,
data structures
,
implementation
,
number theory
1500
x8541
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2521
1732B
Ugu
brute force
,
dp
,
greedy
,
implementation
900
x14759
1732A
Bestie
brute force
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x14765
1731F
Function Sum
brute force
,
combinatorics
,
dp
,
fft
,
math
2500
x677
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x6992
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x9314
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x441
1728E
Red-Black Pepper
brute force
,
data structures
,
greedy
,
math
,
number theory
2300
x1710
1728A
Colored Balls: Revisited
brute force
,
greedy
,
implementation
,
sortings
800
x24518
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3633
1722E
Counting Rectangles
brute force
,
data structures
,
dp
,
implementation
1600
x10541
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x385
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5864
1720B
Interesting Sum
brute force
,
data structures
,
greedy
,
math
,
sortings
800
x20951
1716D
Chip Move
brute force
,
dp
,
math
2000
x5138
1714E
Add Modulo 10
brute force
,
math
,
number theory
1400
x16057
1714D
Color with Occurrences
brute force
,
data structures
,
dp
,
greedy
,
strings
1600
x8939
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x1240
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2105
1711B
Party
brute force
,
graphs
1300
x13277
1710C
XOR Triangle
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
2500
x1326
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x2414
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x540
1709A
Three Doors
brute force
,
greedy
,
implementation
,
math
800
x29380
1707B
Difference Array
brute force
,
data structures
,
implementation
,
sortings
1900
x5652
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1680
1706D1
Chopping Carrots (Easy Version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
number theory
1700
x6826
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x2040
1705C
Mark and His Unfinished Essay
brute force
,
implementation
1400
x13199
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