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Custom test
Problems
#
Name
1726F
Late For Work (submissions are not allowed)
data structures
,
greedy
,
schedules
,
shortest paths
2900
x131
1726E
Almost Perfect
combinatorics
,
fft
,
math
2400
x1346
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3530
1726C
Jatayu's Balanced Bracket Sequence
data structures
,
dsu
,
graphs
,
greedy
1300
x11837
1726B
Mainak and Interesting Sequence
bitmasks
,
constructive algorithms
,
math
1100
x14585
1726A
Mainak and Array
greedy
,
math
900
x19692
1725M
Moving Both Hands
dp
,
graphs
,
shortest paths
1800
x2833
1725L
Lemper Cooking Competition
data structures
2400
x862
1725K
Kingdom of Criticism
data structures
,
dsu
2500
x575
1725J
Journey
dp
,
trees
2500
x356
1725I
Imitating the Key Tree
combinatorics
,
dsu
,
trees
2800
x183
1725H
Hot Black Hot White
constructive algorithms
,
math
1800
x2491
1725G
Garage
binary search
,
geometry
,
math
1500
x5576
1725F
Field Photography
bitmasks
,
data structures
,
sortings
2100
x933
1725E
Electrical Efficiency
combinatorics
,
data structures
,
dp
,
math
,
number theory
,
trees
2500
x432
1725D
Deducing Sortability
binary search
,
bitmasks
,
math
2900
x117
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1532
1725B
Basketball Together
binary search
,
greedy
,
sortings
1000
x11537
1725A
Accumulation of Dominoes
math
800
x9050
1722G
Even-Odd XOR
bitmasks
,
constructive algorithms
,
greedy
1500
x10243
1722F
L-shapes
dfs and similar
,
implementation
1700
x6499
1722E
Counting Rectangles
brute force
,
data structures
,
dp
,
implementation
1600
x9968
1722D
Line
greedy
,
sortings
1100
x22123
1722C
Word Game
data structures
,
implementation
800
x29256
1722B
Colourblindness
implementation
800
x42938
1722A
Spell Check
implementation
800
x46468
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x359
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1801
1721D
Maximum AND
bitmasks
,
dfs and similar
,
divide and conquer
,
greedy
,
sortings
1800
x6261
1721C
Min-Max Array Transformation
binary search
,
greedy
,
two pointers
1400
x12933
1721B
Deadly Laser
implementation
1000
x21499
1721A
Image
greedy
,
implementation
800
x26547
1720E
Misha and Paintings
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
2700
x733
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1720
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5700
1720C
Corners
greedy
,
implementation
1200
x16262
1720B
Interesting Sum
brute force
,
data structures
,
greedy
,
math
,
sortings
800
x20720
1720A
Burenka Plays with Fractions
math
,
number theory
900
x21668
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x12828
1719B
Mathematical Circus
constructive algorithms
,
math
800
x18271
1719A
Chip Game
games
,
math
800
x24958
1718F
Burenka, an Array and Queries
data structures
,
math
,
number theory
3300
x145
1718E
Impressionism
constructive algorithms
,
graphs
,
implementation
,
math
3500
x102
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x286
1718C
Tonya and Burenka-179
data structures
,
greedy
,
math
,
number theory
2400
x1508
1718B
Fibonacci Strings
greedy
,
implementation
,
math
,
number theory
2000
x2865
1718A2
Burenka and Traditions (hard version)
data structures
,
dp
,
greedy
1900
x4966
1718A1
Burenka and Traditions (easy version)
dp
,
greedy
1800
x5459
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x507
1717E
Madoka and The Best University
math
,
number theory
2200
x2453
1717D
Madoka and The Corruption Scheme
combinatorics
,
constructive algorithms
,
greedy
,
math
1900
x4237
1717C
Madoka and Formal Statement
greedy
1300
x14201
1717B
Madoka and Underground Competitions
constructive algorithms
,
implementation
1100
x14461
1717A
Madoka and Strange Thoughts
math
,
number theory
800
x19093
1716F
Bags with Balls
combinatorics
,
dp
,
math
,
number theory
2500
x990
1716E
Swap and Maximum Block
bitmasks
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
2500
x1018
1716D
Chip Move
brute force
,
dp
,
math
2000
x4971
1716C
Robot in a Hallway
data structures
,
dp
,
greedy
,
implementation
,
ternary search
2000
x3997
1716B
Permutation Chain
constructive algorithms
,
math
800
x21177
1716A
2-3 Moves
greedy
,
math
800
x31270
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x500
1715E
Long Way Home
data structures
,
divide and conquer
,
dp
,
geometry
,
graphs
,
greedy
,
shortest paths
2400
x1593
1715D
2+ doors
2-sat
,
bitmasks
,
graphs
,
greedy
1900
x4897
1715C
Monoblock
combinatorics
,
data structures
,
implementation
,
math
1700
x8305
1715B
Beautiful Array
constructive algorithms
,
greedy
,
math
1000
x19991
1715A
Crossmarket
constructive algorithms
,
greedy
,
math
800
x23148
1714G
Path Prefixes
binary search
,
data structures
,
dfs and similar
,
trees
1700
x7071
1714F
Build a Tree and That Is It
constructive algorithms
,
implementation
,
trees
1900
x3051
1714E
Add Modulo 10
brute force
,
math
,
number theory
1400
x15146
1714D
Color with Occurrences
brute force
,
data structures
,
dp
,
greedy
,
strings
1600
x8542
1714C
Minimum Varied Number
greedy
800
x29849
1714B
Remove Prefix
data structures
,
greedy
,
implementation
800
x29210
1714A
Everyone Loves to Sleep
implementation
,
math
900
x28349
1713F
Lost Array
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
2900
x505
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1505
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5420
1713C
Build Permutation
constructive algorithms
,
dp
,
math
1200
x16780
1713B
Optimal Reduction
constructive algorithms
,
sortings
1000
x20699
1713A
Traveling Salesman Problem
geometry
,
greedy
,
implementation
800
x21636
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x302
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x1177
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2033
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4247
1712C
Sort Zero
greedy
,
sortings
1100
x19176
1712B
Woeful Permutation
constructive algorithms
,
greedy
,
number theory
800
x21205
1712A
Wonderful Permutation
greedy
,
implementation
800
x23699
1711B
Party
brute force
,
graphs
1300
x13078
1711A
Perfect Permutation
constructive algorithms
800
x24772
1710E
Two Arrays
binary search
,
games
,
graph matchings
2400
x461
1710D
Recover the Tree
constructive algorithms
,
trees
3400
x405
1710C
XOR Triangle
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
2500
x1266
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x2345
1710A
Color the Picture
constructive algorithms
,
greedy
,
math
1500
x10567
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x526
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2420
1709D
Rorororobot
binary search
,
data structures
,
greedy
,
math
1700
x8044
1709C
Recover an RBS
constructive algorithms
,
greedy
,
implementation
,
strings
1800
x8463
1709B
Also Try Minecraft
data structures
,
dp
,
implementation
900
x21782
1709A
Three Doors
brute force
,
greedy
,
implementation
,
math
800
x28917
1708B
Difference of GCDs
constructive algorithms
,
math
1100
x19411
←
1
2
...
13
14
15
16
17
...
94
95
→
→ Pay attention
Before contest
Codeforces Round 941 (Div. 1)
4 days
Before contest
Codeforces Round 941 (Div. 2)
4 days
→ Filter Problems
Difficulty:
—
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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