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Before contest
Codeforces Round (Div. 2)
5 days
→ Filter Problems
Difficulty:
—
dp
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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
2215A
Interval Mod
constructive algorithms
,
dp
,
greedy
,
math
1700
x2642
2208C
Stamina and Tasks
dp
,
greedy
,
math
1300
x11224
2207C
Where's My Water?
data structures
,
divide and conquer
,
dp
,
math
1600
x5526
2205D
Simons and Beating Peaks
data structures
,
data structures
,
divide and conquer
,
dp
,
dp
,
greedy
,
implementation
,
trees
1700
x4980
2202B
ABAB Construction
dp
,
greedy
,
greedy
,
greedy
,
implementation
1200
x11221
2201C
Rigged Bracket Sequence
combinatorics
,
dp
,
greedy
2000
x2006
2201A2
Lost Civilization (Hard Version)
data structures
,
dp
1700
x5119
2196C2
Interactive Graph (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
graphs
,
interactive
2000
x2532
2196C1
Interactive Graph (Simple Version)
binary search
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
interactive
1800
x3612
2195F
Parabola Independence
dp
,
graphs
,
greedy
,
math
,
sortings
2000
x2719
2195E
Idiot First Search
dfs and similar
,
dp
,
trees
1500
x8603
2194E
The Turtle Strikes Back
dp
,
graphs
,
greedy
,
implementation
2000
x2647
2194C
Secret message
bitmasks
,
brute force
,
dp
,
math
,
number theory
1300
x10949
2193F
Pizza Delivery
dp
,
greedy
1600
x8501
2193E
Product Queries
dp
,
math
,
number theory
,
shortest paths
1300
x15260
2192D
Cost of Tree
dp
,
greedy
,
trees
,
trees
1800
x3579
2190B2
Sub-RBS (Hard Version)
dp
,
games
,
implementation
,
strings
1900
x3192
2190B1
Sub-RBS (Easy Version)
combinatorics
,
constructive algorithms
,
dp
,
greedy
,
strings
,
two pointers
1400
x10717
2189D1
Little String (Easy Version)
combinatorics
,
dp
,
greedy
,
math
,
number theory
1900
x3981
2187B
Shortest Statement Ever
bitmasks
,
constructive algorithms
,
dp
,
greedy
1800
x5311
2184F
Cherry Tree
dfs and similar
,
dp
,
graphs
,
trees
1900
x3921
2184D
Unfair Game
combinatorics
,
dp
,
math
1600
x9528
2182D
Christmas Tree Decoration
combinatorics
,
dp
,
greedy
,
math
1600
x8979
2182C
Production of Snowmen
brute force
,
combinatorics
,
dp
1200
x15572
2181M
Medical Parity
dp
,
strings
1700
x3511
2180D
Insolvable Disks
data structures
,
dp
,
greedy
,
math
1900
x4261
2180C
XOR-factorization
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
1900
x6476
2178C
First or Second
dp
,
greedy
,
implementation
1200
x15744
2176D
Fibonacci Paths
data structures
,
dp
,
graphs
,
sortings
1800
x5783
2174B
Wishing Cards
dp
1900
x3976
2173D
Taiga's Carry Chains
bitmasks
,
brute force
,
dp
,
greedy
,
math
1900
x3653
2171F
Rae Taylor and Trees (hard version)
binary search
,
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1600
x7162
2171D
Rae Taylor and Trees (easy version)
binary search
,
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1400
x11622
2169C
Range Operation
dp
,
greedy
,
math
,
two pointers
1300
x12717
2167G
Mukhammadali and the Smooth Array
data structures
,
dp
1600
x11052
2167F
Tree, TREE!!!
dfs and similar
,
dp
,
math
,
trees
1600
x7161
2165B
Marble Council
dp
,
math
,
sortings
1900
x4616
2163C
Monopati
brute force
,
combinatorics
,
dp
,
math
,
two pointers
1500
x9055
2158C
Annoying Game
dp
,
games
,
greedy
1400
x11104
2157E
Adjusting Drones
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
sortings
1900
x3590
2153D
Not Alone
dp
,
greedy
1800
x6321
2147C
Rabbits
constructive algorithms
,
dp
,
greedy
,
implementation
1500
x9837
2145D
Inversion Value of a Permutation
constructive algorithms
,
dfs and similar
,
dp
1800
x6668
2144D
Price Tags
brute force
,
dp
,
math
1800
x7008
2144C
Non-Descending Arrays
combinatorics
,
dp
,
math
1300
x15015
2143D1
Inversion Graph Coloring (Easy Version)
combinatorics
,
data structures
,
dp
,
greedy
,
two pointers
1800
x6409
2138C2
Maple and Tree Beauty (Hard Version)
bitmasks
,
brute force
,
dfs and similar
,
dp
,
fft
,
trees
2000
x3376
2138C1
Maple and Tree Beauty (Easy Version)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1800
x5433
2135A
Against the Difference
data structures
,
dp
1200
x18467
2133D
Chicken Jockey
dp
,
greedy
1900
x7497
2132D
From 1 to Infinity
binary search
,
dp
,
implementation
,
math
1600
x8840
2131G
Wafu!
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dp
,
math
2000
x3779
2129B
Stay or Mirror
brute force
,
data structures
,
dp
,
greedy
,
sortings
1600
x13384
2129A
Double Perspective
constructive algorithms
,
dp
,
dsu
,
graphs
,
greedy
,
sortings
1300
x16755
2128E1
Submedians (Easy Version)
binary search
,
data structures
,
dp
,
greedy
,
math
1900
x6551
2128D
Sum of LDS
brute force
,
combinatorics
,
dp
,
greedy
,
math
1600
x12316
2125D
Segments Covering
dp
,
math
,
probabilities
1600
x9294
2121E
Sponsor of Your Problems
dp
,
greedy
,
implementation
,
strings
1500
x14703
2118D1
Red Light, Green Light (Easy version)
brute force
,
dfs and similar
,
dp
,
graphs
,
implementation
,
number theory
1700
x8466
2115A
Gellyfish and Flaming Peony
constructive algorithms
,
dp
,
math
,
number theory
1500
x15066
2114F
Small Operations
binary search
,
brute force
,
dfs and similar
,
dp
,
math
,
number theory
,
sortings
2000
x5510
2114E
Kirei Attacks the Estate
dfs and similar
,
dp
,
greedy
,
trees
1400
x14030
2110D
Fewer Batteries
binary search
,
dfs and similar
,
dp
,
graphs
,
greedy
,
hashing
1700
x8618
2108C
Neo's Escape
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
graphs
,
greedy
,
implementation
1500
x14715
2107C
Maximum Subarray Sum
binary search
,
constructive algorithms
,
dp
,
implementation
,
math
1500
x12112
2106F
Goblin
dfs and similar
,
dp
,
dsu
,
greedy
,
math
1900
x4431
2106D
Flower Boy
binary search
,
dp
,
greedy
,
two pointers
1500
x12288
2104E
Unpleasant Strings
binary search
,
dp
,
greedy
,
strings
1700
x8103
2096C
Wonderful City
dp
,
implementation
1700
x8230
2091F
Igor and Mountain
binary search
,
brute force
,
dp
1800
x6165
2086D
Even String
brute force
,
combinatorics
,
dp
,
math
,
strings
1700
x8380
2086C
Disappearing Permutation
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
implementation
1300
x16147
2085C
Serval and The Formula
bitmasks
,
constructive algorithms
,
dp
,
greedy
1600
x13589
2081A
Math Division
bitmasks
,
dp
,
math
,
probabilities
1800
x4089
2078D
Scammy Game Ad
dp
,
greedy
,
implementation
1800
x6543
2075D
Equalization
bitmasks
,
brute force
,
dp
,
graphs
,
math
2000
x5832
2072E
Do You Love Your Hero and His Two-Hit Multi-Target Attacks?
binary search
,
brute force
,
constructive algorithms
,
dp
,
geometry
,
greedy
,
math
1500
x12285
2071D1
Infinite Sequence (Easy Version)
bitmasks
,
brute force
,
dp
,
implementation
,
math
1800
x6700
2071C
Trapmigiano Reggiano
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1700
x9707
2070D
Tree Jumps
dfs and similar
,
dp
,
trees
1600
x11122
2069C
Beautiful Sequence
combinatorics
,
dp
,
greedy
,
two pointers
1500
x14853
2067B
Two Large Bags
brute force
,
dp
,
greedy
,
sortings
1200
x19015
2066B
White Magic
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
1900
x5464
2064D
Eating
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
greedy
,
trees
,
two pointers
1900
x5880
2064C
Remove the Ends
brute force
,
constructive algorithms
,
dp
,
greedy
1300
x17803
2063C
Remove Exactly Two
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x14670
2061E
Kevin and And
bitmasks
,
brute force
,
dp
,
greedy
,
math
,
sortings
2000
x3997
2061C
Kevin and Puzzle
2-sat
,
combinatorics
,
dp
1600
x9971
2053E
Resourceful Caterpillar Sequence
dfs and similar
,
dp
,
games
,
graphs
,
greedy
,
trees
1900
x4522
2053C
Bewitching Stargazer
bitmasks
,
divide and conquer
,
dp
,
math
1500
x12346
2052F
Fix Flooded Floor
constructive algorithms
,
dp
,
graphs
1700
x3747
2050G
Tree Destruction
dfs and similar
,
dp
,
trees
1900
x5395
2050E
Three Strings
dp
,
implementation
,
strings
1500
x14533
2050C
Uninteresting Number
brute force
,
dp
,
math
1200
x25040
2049D
Shift + Esc
brute force
,
dp
1900
x6029
2044G2
Medium Demon Problem (hard version)
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1900
x3838
2043C
Sums on Segments
binary search
,
brute force
,
data structures
,
dp
,
greedy
,
math
1600
x11213
2041C
Cube
bitmasks
,
dfs and similar
,
dp
2000
x2019
2038L
Bridge Renovation
brute force
,
dp
,
greedy
,
math
,
two pointers
1400
x8001
2037G
Natlan Exploring
bitmasks
,
combinatorics
,
data structures
,
dp
,
math
,
number theory
2000
x3740
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