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Problems
#
Name
2217H
Closer
dfs and similar
,
dp
,
trees
2800
x176
2217G
Down the Pivot
combinatorics
,
dp
,
math
,
trees
2600
x304
2217F
Interval Game
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
games
,
games
,
greedy
,
greedy
,
math
,
probabilities
2300
x642
2215D
EXPloration, EXPloitation, and Gain Some EXPerience!
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
2800
x91
2211F
Learning Binary Search
combinatorics
,
divide and conquer
,
dp
,
math
2400
x876
2211E
Minimum Path Cover
brute force
,
dp
,
greedy
,
interactive
,
interactive
,
math
,
number theory
,
trees
2500
x829
2210C2
A Simple GCD Problem (Hard Version)
dp
,
greedy
,
number theory
2100
x2066
2209E
A Trivial String Problem
brute force
,
dp
,
hashing
,
string suffix structures
,
strings
2200
x1706
2208E
Counting Cute Arrays
combinatorics
,
dp
2700
x415
2207F
Hanabi
binary search
,
data structures
,
dp
,
dsu
,
flows
,
graph matchings
,
graphs
,
greedy
2900
x264
2207D
Boxed Like a Fish
dfs and similar
,
dp
,
games
,
shortest paths
,
trees
2200
x2074
2206I
Growth Factor
combinatorics
,
dp
,
math
,
number theory
2900
x158
2206D
Christmas Tree Un-decoration
data structures
,
dp
,
trees
2600
x227
2205E
Simons and Dividing the Rhythm
combinatorics
,
data structures
,
dp
,
dsu
,
math
,
string suffix structures
,
strings
,
strings
,
strings
2100
x1530
2204G
Grid Path
dp
,
dp
,
graphs
,
matrices
2700
x392
2203F
Binary Search with One Swap
binary search
,
divide and conquer
,
dp
,
hashing
,
math
,
two pointers
2600
x403
2201C
Rigged Bracket Sequence
combinatorics
,
dp
,
greedy
2000
x1945
2200G
Operation Permutation
combinatorics
,
dp
,
math
,
probabilities
2200
x993
2199H
Sum of MEX
*special problem
,
combinatorics
,
data structures
,
dp
,
math
2300
x89
2196E2
Fuzzy Concatenation (Hard version)
binary search
,
bitmasks
,
data structures
,
dp
,
greedy
,
string suffix structures
3000
x196
2196D
Double Bracket Sequence
data structures
,
dp
,
expression parsing
,
flows
,
greedy
,
strings
2500
x981
2196C2
Interactive Graph (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
graphs
,
interactive
2000
x2490
2196C1
Interactive Graph (Simple Version)
binary search
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
interactive
1800
x3558
2195G
Idiot First Search and Queries
binary search
,
data structures
,
dp
,
graphs
,
trees
2300
x1024
2195F
Parabola Independence
dp
,
graphs
,
greedy
,
math
,
sortings
2000
x2657
2194F2
Again Trees... (hard version)
bitmasks
,
data structures
,
dfs and similar
,
dp
,
fft
,
trees
3000
x166
2194F1
Again Trees... (Easy Version)
bitmasks
,
dfs and similar
,
dp
,
trees
2300
x878
2194E
The Turtle Strikes Back
dp
,
graphs
,
greedy
,
implementation
2000
x2577
2193H
Remove the Grail Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
implementation
,
trees
2400
x1034
2192F
Fish Fight
dp
,
dp
,
math
,
probabilities
,
probabilities
2900
x168
2192D
Cost of Tree
dp
,
greedy
,
trees
,
trees
1800
x3503
2190F
Xor Product
bitmasks
,
dp
3300
x91
2190B2
Sub-RBS (Hard Version)
dp
,
games
,
implementation
,
strings
1900
x3161
2189F
Zhora the Vacuum Cleaner
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
,
trees
2800
x221
2189D2
Little String (Hard Version)
combinatorics
,
dp
,
greedy
,
math
,
number theory
2200
x1921
2189D1
Little String (Easy Version)
combinatorics
,
dp
,
greedy
,
math
,
number theory
1900
x3920
2187F2
Al Fine (Counting Version)
dp
,
trees
3500
x65
2187E
Doors and Keys
brute force
,
data structures
,
dp
3500
x314
2187D
Cool Problem
bitmasks
,
dp
,
math
2600
x619
2187B
Shortest Statement Ever
bitmasks
,
constructive algorithms
,
dp
,
greedy
1800
x5224
2185H
BattleCows 2
binary search
,
brute force
,
data structures
,
dp
,
greedy
2500
x669
2184F
Cherry Tree
dfs and similar
,
dp
,
graphs
,
trees
1900
x3842
2183H
Minimise Cost
binary search
,
dp
,
greedy
,
sortings
3500
x158
2183F
Jumping Man
brute force
,
combinatorics
,
dfs and similar
,
dp
,
trees
2500
x1112
2183E
LCM is Legendary Counting Master
dp
,
math
,
number theory
2100
x2839
2182G
Short Garland
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2800
x347
2182F1
Christmas Reindeer (easy version)
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
2300
x1267
2181J
Jinx or Jackpot
brute force
,
dp
,
math
,
probabilities
2300
x700
2181G
Greta's Game
binary search
,
dp
,
graphs
,
greedy
,
math
2400
x631
2180F2
Control Car (Hard Version)
combinatorics
,
dp
,
matrices
,
probabilities
3200
x223
2180F1
Control Car (Easy Version)
combinatorics
,
dp
,
probabilities
2800
x405
2180E
No Effect XOR
bitmasks
,
divide and conquer
,
dp
,
greedy
,
math
2300
x1731
2180D
Insolvable Disks
data structures
,
dp
,
greedy
,
math
1900
x4233
2180C
XOR-factorization
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
1900
x6416
2179H
Blackslex and Plants
bitmasks
,
data structures
,
dp
,
implementation
,
math
2200
x1292
2178I
Numbers or Fireworks
bitmasks
,
combinatorics
,
dp
,
graphs
3300
x215
2178G
deCH OR Dations
bitmasks
,
data structures
,
dp
,
hashing
,
probabilities
2800
x590
2176F
Omega Numbers
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2400
x1475
2176E
Remove at the lowest cost
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2400
x1255
2176D
Fibonacci Paths
data structures
,
dp
,
graphs
,
sortings
1800
x5721
2174F
Mosaic Tree
combinatorics
,
dp
,
fft
,
math
,
trees
2800
x457
2174D
Secret Message
data structures
,
dp
,
greedy
,
trees
3400
x290
2174B
Wishing Cards
dp
1900
x3940
2173D
Taiga's Carry Chains
bitmasks
,
brute force
,
dp
,
greedy
,
math
1900
x3613
2172L
Maximum Color Segment
dp
,
implementation
2300
x793
2172D
Divisor Card Game
combinatorics
,
dp
3100
x99
2171H
Shiori Miyagi and Maximum Array Score
binary search
,
data structures
,
dp
,
sortings
2400
x1006
2170F
Build XOR on a Segment
bitmasks
,
dp
2600
x775
2170E
Binary Strings and Blocks
combinatorics
,
data structures
,
dp
2100
x2312
2169F
Subsequence Problem
combinatorics
,
dp
,
fft
,
math
2700
x330
2169E
Points Selection
dp
,
greedy
2400
x1019
2165E
Rainbow Branch
constructive algorithms
,
dp
,
greedy
,
trees
3200
x251
2165B
Marble Council
dp
,
math
,
sortings
1900
x4488
2164F2
Chain Prefix Rank (Hard Version)
binary search
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
math
,
trees
2900
x420
2164F1
Chain Prefix Rank (Easy Version)
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2600
x647
2162H
Beautiful Problem
dp
2900
x312
2161D
Locked Out
binary search
,
data structures
,
dp
,
greedy
2100
x2759
2159D2
Inverse Minimum Partition (Hard Version)
dp
,
greedy
,
math
3200
x393
2159D1
Inverse Minimum Partition (Easy Version)
binary search
,
brute force
,
dp
,
geometry
,
greedy
,
math
,
two pointers
2500
x1013
2159B
Rectangles
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
two pointers
2100
x2301
2157I
Hyper Smawk Bros
dp
,
dp
,
games
3500
x168
2157G
Isaac's Queries
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
interactive
,
math
,
probabilities
2800
x406
2157E
Adjusting Drones
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
sortings
1900
x3548
2156E
Best Time to Buy and Sell Stock
binary search
,
brute force
,
data structures
,
dp
,
games
,
graphs
,
greedy
2500
x954
2154F2
Bombing (Hard Version)
combinatorics
,
dp
3300
x174
2153D
Not Alone
dp
,
greedy
1800
x6269
2152H1
Victorious Coloring (Easy Version)
dfs and similar
,
dp
,
greedy
2900
x592
2150D
Attraction Theory
combinatorics
,
dp
,
math
2700
x749
2150C
Limited Edition Shop
data structures
,
dp
2100
x2636
2146F
Bubble Sort
brute force
,
combinatorics
,
dp
2900
x301
2145G
Cost of Coloring
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
2900
x523
2145F
Long Journey
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
greedy
,
math
,
matrices
,
number theory
2500
x979
2145D
Inversion Value of a Permutation
constructive algorithms
,
dfs and similar
,
dp
1800
x6650
2144F
Bracket Groups
brute force
,
constructive algorithms
,
dp
,
string suffix structures
,
strings
2700
x913
2144E2
Looking at Towers (difficult version)
combinatorics
,
data structures
,
dp
2500
x1431
2144E1
Looking at Towers (easy version)
combinatorics
,
dp
2200
x2552
2144D
Price Tags
brute force
,
dp
,
math
1800
x6983
2143D2
Inversion Graph Coloring (Hard Version)
binary search
,
combinatorics
,
data structures
,
dp
,
two pointers
2200
x2751
2143D1
Inversion Graph Coloring (Easy Version)
combinatorics
,
data structures
,
dp
,
greedy
,
two pointers
1800
x6376
2141E
Perfect Cut
*special problem
,
dp
,
greedy
2100
x255
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45:51:23
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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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