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Before contest
Codeforces Round 973 (Div. 2)
14:00:54
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*has extra registration
→ Filter Problems
Difficulty:
—
two pointers
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
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x1050
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x6074
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x20111
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x14038
1791C
Prepend and Append
implementation
,
two pointers
800
x44875
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x16137
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3897
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x165
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1300
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x8462
1776H
Beppa and SwerChat
two pointers
1300
x6347
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7806
1772G
Gaining Rating
binary search
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
2200
x1335
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x688
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x14240
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1180
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x4125
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1828
1760D
Challenging Valleys
implementation
,
two pointers
1000
x23555
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x7263
1753F
Minecraft Series
brute force
,
two pointers
3500
x205
1746B
Rebellion
constructive algorithms
,
greedy
,
two pointers
800
x17118
1744F
MEX vs MED
math
,
two pointers
2000
x3063
1744C
Traffic Light
binary search
,
implementation
,
two pointers
1000
x26968
1741C
Minimize the Thickness
brute force
,
greedy
,
math
,
two pointers
1100
x17711
1738E
Balance Addicts
combinatorics
,
dp
,
math
,
two pointers
2300
x1531
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1279
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14965
1734D
Slime Escape
data structures
,
dp
,
greedy
,
two pointers
1800
x6268
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2559
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x5870
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x7089
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2656
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2164
1729D
Friends and the Restaurant
greedy
,
sortings
,
two pointers
1200
x20502
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x462
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x7197
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1615
1721C
Min-Max Array Transformation
binary search
,
greedy
,
two pointers
1400
x13322
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5952
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x13177
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x1259
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2140
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1696
1701D
Permutation Restoration
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1900
x5656
1701C
Schedule Management
binary search
,
greedy
,
implementation
,
two pointers
1400
x16875
1699E
Three Days Grace
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2600
x1138
1698E
PermutationForces II
brute force
,
combinatorics
,
greedy
,
sortings
,
trees
,
two pointers
2300
x1633
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x14312
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x161
1693F
I Might Be Wrong
binary search
,
greedy
,
two pointers
3400
x400
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x17546
1692E
Binary Deque
binary search
,
implementation
,
two pointers
1200
x21740
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x5766
1691B
Shoe Shuffling
constructive algorithms
,
greedy
,
implementation
,
two pointers
1000
x22910
1690E
Price Maximization
binary search
,
greedy
,
math
,
two pointers
1500
x15134
1690D
Black and White Stripe
implementation
,
two pointers
1000
x29305
1689A
Lex String
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
800
x16756
1684F
Diverse Segments
data structures
,
two pointers
2600
x896
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3148
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x312
1680C
Binary String
binary search
,
greedy
,
strings
,
two pointers
1600
x9893
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x16647
1672D
Cyclic Rotation
constructive algorithms
,
greedy
,
implementation
,
two pointers
1700
x6213
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x25512
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x1514
1660D
Maximum Product Strikes Back
brute force
,
implementation
,
math
,
two pointers
1600
x8626
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3997
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x18738
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x21123
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1148
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x223
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4634
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2925
1630B
Range and Partition
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5720
1628A
Meximum Array
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
1400
x15571
1627E
Not Escaping
data structures
,
dp
,
implementation
,
shortest paths
,
two pointers
2200
x2365
1626C
Monsters And Spells
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1700
x10888
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x4028
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x1134
1611F
ATM and Students
binary search
,
data structures
,
two pointers
1800
x6424
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x7246
1610B
Kalindrome Array
greedy
,
two pointers
1100
x15783
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x776
1609C
Complex Market Analysis
binary search
,
dp
,
implementation
,
number theory
,
schedules
,
two pointers
1400
x9708
1608C
Game Master
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
two pointers
1700
x6623
1607H
Banquet Preparations 2
greedy
,
sortings
,
two pointers
2200
x1228
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x1029
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4934
1600E
Array Game
games
,
greedy
,
two pointers
1900
x2082
1599A
Weights
constructive algorithms
,
greedy
,
two pointers
2600
x675
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x20734
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1631
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x281
1582F2
Korney Korneevich and XOR (hard version)
binary search
,
brute force
,
dp
,
greedy
,
two pointers
2400
x1801
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x15511
1572B
Xor of 3
brute force
,
constructive algorithms
,
greedy
,
two pointers
2500
x1816
1569D
Inconvenient Pairs
binary search
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x4368
1566D2
Seating Arrangements (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x7829
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2630
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