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Before contest
Codeforces Round (Div. 2)
6 days
→ 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
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x3876
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x13052
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x2477
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x12466
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x9961
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x437
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x2546
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x601
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1073
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x1657
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x215
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1120
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x850
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x2829
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x9572
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x715
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x4617
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x13376
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x10129
1791C
Prepend and Append
implementation
,
two pointers
800
x31605
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x13917
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3069
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x110
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1166
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x5948
1776H
Beppa and SwerChat
two pointers
1300
x4400
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x6097
1772G
Gaining Rating
binary search
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
2200
x1029
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x563
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x10017
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x980
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x2974
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1416
1760D
Challenging Valleys
implementation
,
two pointers
1000
x18410
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x5530
1753F
Minecraft Series
brute force
,
two pointers
3500
x144
1746B
Rebellion
constructive algorithms
,
greedy
,
two pointers
800
x15573
1744F
MEX vs MED
math
,
two pointers
2000
x2219
1744C
Traffic Light
binary search
,
implementation
,
two pointers
1000
x19065
1741C
Minimize the Thickness
brute force
,
greedy
,
math
,
two pointers
1100
x15090
1738E
Balance Addicts
combinatorics
,
dp
,
math
,
two pointers
2300
x1266
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1053
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x12327
1734D
Slime Escape
data structures
,
dp
,
greedy
,
two pointers
1800
x5117
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2092
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x4516
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x5535
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2329
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x1766
1729D
Friends and the Restaurant
greedy
,
sortings
,
two pointers
1200
x15476
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x324
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x5840
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1227
1721C
Min-Max Array Transformation
binary search
,
greedy
,
two pointers
1400
x11419
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5017
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x11438
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x990
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x1785
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1439
1701D
Permutation Restoration
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1900
x4973
1701C
Schedule Management
binary search
,
greedy
,
implementation
,
two pointers
1400
x13470
1699E
Three Days Grace
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2600
x911
1698E
PermutationForces II
brute force
,
combinatorics
,
greedy
,
sortings
,
trees
,
two pointers
2300
x1452
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x12476
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x96
1693F
I Might Be Wrong
binary search
,
greedy
,
two pointers
3400
x217
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x12649
1692E
Binary Deque
binary search
,
implementation
,
two pointers
1200
x15964
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x4624
1691B
Shoe Shuffling
constructive algorithms
,
greedy
,
implementation
,
two pointers
1000
x19025
1690E
Price Maximization
binary search
,
greedy
,
math
,
two pointers
1500
x12449
1690D
Black and White Stripe
implementation
,
two pointers
1000
x21740
1689A
Lex String
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
800
x15553
1684F
Diverse Segments
data structures
,
two pointers
2600
x748
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x2720
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x244
1680C
Binary String
binary search
,
greedy
,
strings
,
two pointers
1600
x8186
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x13257
1672D
Cyclic Rotation
constructive algorithms
,
greedy
,
implementation
,
two pointers
1700
x5420
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x18174
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x1193
1660D
Maximum Product Strikes Back
brute force
,
implementation
,
math
,
two pointers
1600
x7081
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3491
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x15896
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x19552
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x841
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x163
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x3944
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2556
1630B
Range and Partition
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x4945
1628A
Meximum Array
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
1400
x13870
1627E
Not Escaping
data structures
,
dp
,
implementation
,
shortest paths
,
two pointers
2200
x1914
1626C
Monsters And Spells
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1700
x9607
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x3368
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x849
1611F
ATM and Students
binary search
,
data structures
,
two pointers
1800
x5341
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x5963
1610B
Kalindrome Array
greedy
,
two pointers
1100
x13373
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x588
1609C
Complex Market Analysis
binary search
,
dp
,
implementation
,
number theory
,
schedules
,
two pointers
1400
x8739
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