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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
2217H
Closer
dfs and similar
,
dp
,
trees
2800
x211
2217G
Down the Pivot
combinatorics
,
dp
,
math
,
trees
2600
x363
2217F
Interval Game
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
games
,
games
,
greedy
,
greedy
,
math
,
probabilities
2300
x730
2215D
EXPloration, EXPloitation, and Gain Some EXPerience!
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
2800
x118
2211F
Learning Binary Search
combinatorics
,
divide and conquer
,
dp
,
math
2400
x935
2211E
Minimum Path Cover
brute force
,
dp
,
greedy
,
interactive
,
interactive
,
math
,
number theory
,
trees
2500
x865
2210C2
A Simple GCD Problem (Hard Version)
dp
,
greedy
,
number theory
2100
x2178
2209E
A Trivial String Problem
brute force
,
dp
,
hashing
,
string suffix structures
,
strings
2200
x1803
2208E
Counting Cute Arrays
combinatorics
,
dp
2700
x430
2207F
Hanabi
binary search
,
data structures
,
dp
,
dsu
,
flows
,
graph matchings
,
graphs
,
greedy
2900
x270
2207D
Boxed Like a Fish
dfs and similar
,
dp
,
games
,
shortest paths
,
trees
2200
x2131
2206I
Growth Factor
combinatorics
,
dp
,
math
,
number theory
2900
x169
2206D
Christmas Tree Un-decoration
data structures
,
dp
,
trees
2600
x243
2205E
Simons and Dividing the Rhythm
combinatorics
,
data structures
,
dp
,
dsu
,
math
,
string suffix structures
,
strings
,
strings
,
strings
2100
x1584
2204G
Grid Path
dp
,
dp
,
graphs
,
matrices
2700
x408
2203F
Binary Search with One Swap
binary search
,
divide and conquer
,
dp
,
hashing
,
math
,
two pointers
2600
x417
2201C
Rigged Bracket Sequence
combinatorics
,
dp
,
greedy
2000
x2006
2200G
Operation Permutation
combinatorics
,
dp
,
math
,
probabilities
2200
x1040
2199H
Sum of MEX
*special problem
,
combinatorics
,
data structures
,
dp
,
math
2300
x91
2196E2
Fuzzy Concatenation (Hard version)
binary search
,
bitmasks
,
data structures
,
dp
,
greedy
,
string suffix structures
3000
x200
2196D
Double Bracket Sequence
data structures
,
dp
,
expression parsing
,
flows
,
greedy
,
strings
2500
x1001
2196C2
Interactive Graph (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
graphs
,
interactive
2000
x2532
2195G
Idiot First Search and Queries
binary search
,
data structures
,
dp
,
graphs
,
trees
2300
x1053
2195F
Parabola Independence
dp
,
graphs
,
greedy
,
math
,
sortings
2000
x2719
2194F2
Again Trees... (hard version)
bitmasks
,
data structures
,
dfs and similar
,
dp
,
fft
,
trees
3000
x170
2194F1
Again Trees... (Easy Version)
bitmasks
,
dfs and similar
,
dp
,
trees
2300
x895
2194E
The Turtle Strikes Back
dp
,
graphs
,
greedy
,
implementation
2000
x2647
2193H
Remove the Grail Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
implementation
,
trees
2400
x1050
2192F
Fish Fight
dp
,
dp
,
math
,
probabilities
,
probabilities
2900
x173
2190F
Xor Product
bitmasks
,
dp
3300
x93
2189F
Zhora the Vacuum Cleaner
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
,
trees
2800
x227
2189D2
Little String (Hard Version)
combinatorics
,
dp
,
greedy
,
math
,
number theory
2200
x1948
2187F2
Al Fine (Counting Version)
dp
,
trees
3500
x72
2187E
Doors and Keys
brute force
,
data structures
,
dp
3500
x331
2187D
Cool Problem
bitmasks
,
dp
,
math
2600
x637
2185H
BattleCows 2
binary search
,
brute force
,
data structures
,
dp
,
greedy
2500
x685
2183H
Minimise Cost
binary search
,
dp
,
greedy
,
sortings
3500
x159
2183F
Jumping Man
brute force
,
combinatorics
,
dfs and similar
,
dp
,
trees
2500
x1132
2183E
LCM is Legendary Counting Master
dp
,
math
,
number theory
2100
x2864
2182G
Short Garland
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2800
x353
2182F1
Christmas Reindeer (easy version)
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
2300
x1273
2181J
Jinx or Jackpot
brute force
,
dp
,
math
,
probabilities
2300
x714
2181G
Greta's Game
binary search
,
dp
,
graphs
,
greedy
,
math
2400
x651
2180F2
Control Car (Hard Version)
combinatorics
,
dp
,
matrices
,
probabilities
3200
x223
2180F1
Control Car (Easy Version)
combinatorics
,
dp
,
probabilities
2800
x406
2180E
No Effect XOR
bitmasks
,
divide and conquer
,
dp
,
greedy
,
math
2300
x1745
2179H
Blackslex and Plants
bitmasks
,
data structures
,
dp
,
implementation
,
math
2200
x1308
2178I
Numbers or Fireworks
bitmasks
,
combinatorics
,
dp
,
graphs
3300
x219
2178G
deCH OR Dations
bitmasks
,
data structures
,
dp
,
hashing
,
probabilities
2800
x594
2176F
Omega Numbers
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2400
x1495
2176E
Remove at the lowest cost
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2400
x1280
2174F
Mosaic Tree
combinatorics
,
dp
,
fft
,
math
,
trees
2800
x467
2174D
Secret Message
data structures
,
dp
,
greedy
,
trees
3400
x293
2172L
Maximum Color Segment
dp
,
implementation
2300
x804
2172D
Divisor Card Game
combinatorics
,
dp
3100
x103
2171H
Shiori Miyagi and Maximum Array Score
binary search
,
data structures
,
dp
,
sortings
2400
x1021
2170F
Build XOR on a Segment
bitmasks
,
dp
2600
x783
2170E
Binary Strings and Blocks
combinatorics
,
data structures
,
dp
2100
x2327
2169F
Subsequence Problem
combinatorics
,
dp
,
fft
,
math
2700
x337
2169E
Points Selection
dp
,
greedy
2400
x1049
2165E
Rainbow Branch
constructive algorithms
,
dp
,
greedy
,
trees
3200
x260
2164F2
Chain Prefix Rank (Hard Version)
binary search
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
math
,
trees
2900
x424
2164F1
Chain Prefix Rank (Easy Version)
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2600
x659
2162H
Beautiful Problem
dp
2900
x314
2161D
Locked Out
binary search
,
data structures
,
dp
,
greedy
2100
x2780
2159D2
Inverse Minimum Partition (Hard Version)
dp
,
greedy
,
math
3200
x396
2159D1
Inverse Minimum Partition (Easy Version)
binary search
,
brute force
,
dp
,
geometry
,
greedy
,
math
,
two pointers
2500
x1037
2159B
Rectangles
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
two pointers
2100
x2354
2157I
Hyper Smawk Bros
dp
,
dp
,
games
3500
x171
2157G
Isaac's Queries
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
interactive
,
math
,
probabilities
2800
x411
2156E
Best Time to Buy and Sell Stock
binary search
,
brute force
,
data structures
,
dp
,
games
,
graphs
,
greedy
2500
x963
2154F2
Bombing (Hard Version)
combinatorics
,
dp
3300
x175
2152H1
Victorious Coloring (Easy Version)
dfs and similar
,
dp
,
greedy
2900
x660
2150D
Attraction Theory
combinatorics
,
dp
,
math
2700
x753
2150C
Limited Edition Shop
data structures
,
dp
2100
x2694
2146F
Bubble Sort
brute force
,
combinatorics
,
dp
2900
x303
2145G
Cost of Coloring
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
2900
x524
2145F
Long Journey
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
greedy
,
math
,
matrices
,
number theory
2500
x985
2144F
Bracket Groups
brute force
,
constructive algorithms
,
dp
,
string suffix structures
,
strings
2700
x920
2144E2
Looking at Towers (difficult version)
combinatorics
,
data structures
,
dp
2500
x1437
2144E1
Looking at Towers (easy version)
combinatorics
,
dp
2200
x2559
2143D2
Inversion Graph Coloring (Hard Version)
binary search
,
combinatorics
,
data structures
,
dp
,
two pointers
2200
x2778
2141E
Perfect Cut
*special problem
,
dp
,
greedy
2100
x257
2140E2
Prime Gaming (Hard Version)
bitmasks
,
combinatorics
,
dp
,
probabilities
2500
x1240
2140E1
Prime Gaming (Easy Version)
bitmasks
,
combinatorics
,
dp
2200
x2112
2138C2
Maple and Tree Beauty (Hard Version)
bitmasks
,
brute force
,
dfs and similar
,
dp
,
fft
,
trees
2000
x3376
2137G
Cry Me a River
dfs and similar
,
dp
,
games
,
graphs
2200
x1939
2135E2
Beyond the Palindrome (Hard Version)
combinatorics
,
dp
,
math
,
number theory
3500
x166
2135E1
Beyond the Palindrome (Easy Version)
combinatorics
,
dp
,
math
3300
x258
2134F
Permutation Oddness
combinatorics
,
dp
,
math
2900
x647
2134E
Power Boxes
constructive algorithms
,
dp
,
implementation
,
interactive
2300
x2404
2133F
Flint and Steel
data structures
,
dp
,
graphs
3000
x467
2133E
I Yearned For The Mines
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1697
2131G
Wafu!
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dp
,
math
2000
x3779
2129D
Permutation Blackhole
brute force
,
combinatorics
,
dp
,
implementation
,
math
2600
x989
2129C3
Interactive RBS (Hard Version)
binary search
,
bitmasks
,
constructive algorithms
,
dp
,
interactive
2300
x1669
2127H
23 Rises Again
brute force
,
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
,
probabilities
,
trees
3100
x590
2127F
Hamed and AghaBalaSar
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2800
x1115
2126G1
Big Wins! (easy version)
binary search
,
data structures
,
dp
,
dsu
,
two pointers
2200
x2490
2125F
Timofey and Docker
binary search
,
divide and conquer
,
dp
3000
x399
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