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Before contest
Codeforces Round #851 (Div. 2)
37:01:07
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Difficulty:
—
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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Problems
#
Name
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x197
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x751
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x7410
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x5734
1791D
Distinct Split
brute force
,
greedy
,
strings
1000
x15052
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x1815
1790C
Premutation
brute force
,
implementation
,
math
1000
x15783
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x208
1786B
Cake Assembly Line
brute force
,
sortings
x5064
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
x111
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x1488
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x2959
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1081
1781D
Many Perfect Squares
brute force
,
math
,
number theory
1800
x3748
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x4994
1781B
Going to the Cinema
brute force
,
greedy
,
sortings
1000
x10691
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
x806
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
x820
1780B
GCD Partition
brute force
,
greedy
,
math
,
number theory
x12031
1779H
Olympic Team Building
brute force
,
meet-in-the-middle
3500
x98
1778C
Flexible String
bitmasks
,
brute force
,
strings
x4928
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x15915
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x177
1774F2
Magician and Pigs (Hard Version)
binary search
,
brute force
,
data structures
,
implementation
2700
x444
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x813
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x5465
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x324
1772B
Matrix Rotation
brute force
,
implementation
800
x22321
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x511
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x1903
1770C
Koxia and Number Theory
brute force
,
chinese remainder theorem
,
math
,
number theory
1700
x6807
1770A
Koxia and Whiteboards
brute force
,
greedy
1000
x18449
1769D3
Игра в Девятку III
*special problem
,
brute force
2300
x104
1769D2
Игра в Девятку II
*special problem
,
brute force
2200
x175
1769D1
Игра в Девятку I
*special problem
,
brute force
,
dp
1800
x313
1769C1
Подкрутка I
*special problem
,
brute force
,
dp
,
greedy
1200
x719
1769B2
Копирование файлов II
*special problem
,
binary search
,
brute force
,
math
1400
x729
1769B1
Копирование файлов I
*special problem
,
brute force
,
implementation
,
math
1000
x1104
1767E
Algebra Flash
bitmasks
,
brute force
,
dp
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x542
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x869
1766A
Extremely Round
brute force
,
implementation
800
x18822
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x415
1765E
Exchange
brute force
,
math
1000
x6629
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x691
1763C
Another Array Problem
brute force
,
constructive algorithms
,
greedy
2000
x4889
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x10125
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1336
1761A
Two Permutations
brute force
,
constructive algorithms
800
x13533
1759E
The Humanoid
brute force
,
dp
,
sortings
1500
x6801
1759D
Make It Round
brute force
,
number theory
1400
x8225
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x4937
1753F
Minecraft Series
brute force
,
two pointers
3500
x128
1753E
N Machines
binary search
,
brute force
,
greedy
3300
x227
1750B
Maximum Substring
brute force
,
greedy
,
implementation
800
x14511
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x7703
1748B
Diverse Substrings
brute force
,
implementation
,
strings
1400
x11190
1744E2
Divisible Numbers (hard version)
brute force
,
math
,
number theory
1900
x3774
1744E1
Divisible Numbers (easy version)
brute force
,
math
,
number theory
1500
x7382
1743D
Problem with Random Tests
brute force
,
dp
,
greedy
,
probabilities
1700
x5951
1743A
Password
brute force
,
combinatorics
,
implementation
,
math
800
x22543
1742G
Orray
bitmasks
,
brute force
,
greedy
,
math
,
sortings
1500
x6757
1742D
Coprime
brute force
,
greedy
,
number theory
1100
x15630
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1072
1741C
Minimize the Thickness
brute force
,
greedy
,
math
,
two pointers
1100
x14183
1737D
Ela and the Wiring Wizard
brute force
,
dp
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x1597
1736A
Make A Equal to B
brute force
,
greedy
,
sortings
800
x19922
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x4386
1734A
Select Three Sticks
brute force
,
greedy
,
sortings
800
x18661
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1076
1732D1
Balance (Easy version)
brute force
,
data structures
,
implementation
,
number theory
1500
x6226
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x1965
1732B
Ugu
brute force
,
dp
,
greedy
,
implementation
900
x11287
1732A
Bestie
brute force
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x11610
1731F
Function Sum
brute force
,
combinatorics
,
dp
,
fft
,
math
2500
x479
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x5031
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x6901
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x302
1728E
Red-Black Pepper
brute force
,
data structures
,
greedy
,
math
,
number theory
2300
x1363
1728A
Colored Balls: Revisited
brute force
,
greedy
,
implementation
,
sortings
800
x22482
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x2994
1722E
Counting Rectangles
brute force
,
data structures
,
dp
,
implementation
1600
x7454
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x275
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x4756
1720B
Interesting Sum
brute force
,
data structures
,
greedy
,
math
,
sortings
800
x18744
1716D
Chip Move
brute force
,
dp
,
math
2000
x4080
1714E
Add Modulo 10
brute force
,
math
,
number theory
1400
x11674
1714D
Color with Occurrences
brute force
,
data structures
,
dp
,
greedy
,
strings
1600
x6917
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x929
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x1678
1711B
Party
brute force
,
graphs
1300
x11609
1710C
XOR Triangle
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
2500
x1083
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x1991
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x447
1709A
Three Doors
brute force
,
greedy
,
implementation
,
math
800
x25532
1707B
Difference Array
brute force
,
data structures
,
implementation
,
sortings
1900
x4699
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1384
1706D1
Chopping Carrots (Easy Version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
number theory
1700
x5677
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x1660
1705C
Mark and His Unfinished Essay
brute force
,
implementation
1400
x11258
1704E
Count Seconds
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
2200
x1932
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