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Before contest
Codeforces Round 974 (Div. 3)
19:10:07
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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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Problems
#
Name
1747E
List Generation
combinatorics
,
dp
,
math
2900
x508
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x4631
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x96
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x1714
1746E2
Joking (Hard Version)
dp
,
interactive
3200
x391
1746E1
Joking (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
ternary search
2500
x1428
1746D
Paths on the Tree
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1900
x4592
1744F
MEX vs MED
math
,
two pointers
2000
x3065
1744E2
Divisible Numbers (hard version)
brute force
,
math
,
number theory
1900
x5564
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x255
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1483
1743E
FTL
binary search
,
dp
2400
x1555
1743D
Problem with Random Tests
brute force
,
dp
,
greedy
,
probabilities
1700
x7563
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1491
1741F
Multi-Colored Segments
binary search
,
data structures
,
math
,
sortings
2000
x2374
1741E
Sending a Sequence Over the Network
dp
1600
x12126
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x113
1740H
MEX Tree Manipulation
data structures
,
trees
3300
x232
1740G
Dangerous Laser Power
constructive algorithms
,
dsu
,
sortings
3100
x185
1740F
Conditional Mix
combinatorics
,
dp
,
math
2600
x793
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4310
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x528
1739E
Cleaning Robot
bitmasks
,
dp
2400
x1216
1739D
Reset K Edges
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x5137
1738H
Palindrome Addicts
data structures
,
strings
3300
x235
1738G
Anti-Increasing Addicts
constructive algorithms
,
dp
,
greedy
,
math
2900
x426
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1215
1738E
Balance Addicts
combinatorics
,
dp
,
math
,
two pointers
2300
x1532
1738D
Permutation Addicts
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
1900
x3422
1737G
Ela Takes Dancing Class
binary search
,
data structures
3500
x116
1737F
Ela and Prime GCD
constructive algorithms
,
math
,
number theory
3300
x123
1737E
Ela Goes Hiking
combinatorics
,
dp
,
math
,
probabilities
2500
x927
1737D
Ela and the Wiring Wizard
brute force
,
dp
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x1854
1736E
Swap and Take
dp
,
greedy
2600
x706
1736D
Equal Binary Subsequences
constructive algorithms
,
geometry
,
greedy
,
implementation
,
strings
2200
x2472
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1279
1735F
Pebbles and Beads
data structures
,
geometry
2900
x229
1735E
House Planning
constructive algorithms
,
data structures
,
graph matchings
,
greedy
2400
x1059
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5471
1734F
Zeros and Ones
bitmasks
,
divide and conquer
,
dp
,
math
2500
x796
1734E
Rectangular Congruence
constructive algorithms
,
number theory
2100
x2894
1734D
Slime Escape
data structures
,
dp
,
greedy
,
two pointers
1800
x6269
1733E
Conveyor
constructive algorithms
,
dp
,
math
2700
x1222
1733D2
Zero-One (Hard Version)
dp
,
greedy
2000
x4159
1732E
Location
data structures
,
dp
,
math
,
number theory
2800
x456
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1398
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2559
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x5872
1731F
Function Sum
brute force
,
combinatorics
,
dp
,
fft
,
math
2500
x686
1731E
Graph Cost
dp
,
greedy
,
math
,
number theory
2000
x2800
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x7090
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x9460
1730F
Almost Sorted
bitmasks
,
data structures
,
dp
2700
x546
1730E
Maximums and Minimums
combinatorics
,
data structures
,
divide and conquer
,
number theory
2700
x637
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2658
1730B
Meeting on the Line
binary search
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
1600
x12582
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2166
1729F
Kirei and the Linear Function
hashing
,
math
1900
x4136
1729E
Guess the Cycle Size
interactive
,
probabilities
1800
x6983
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x462
1728F
Fishermen
flows
,
graph matchings
,
greedy
3100
x428
1728E
Red-Black Pepper
brute force
,
data structures
,
greedy
,
math
,
number theory
2300
x1733
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x7201
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x86
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x290
1726F
Late For Work (submissions are not allowed)
data structures
,
greedy
,
schedules
,
shortest paths
2900
x131
1726E
Almost Perfect
combinatorics
,
fft
,
math
2400
x1413
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3673
1725M
Moving Both Hands
dp
,
graphs
,
shortest paths
1800
x3099
1725L
Lemper Cooking Competition
data structures
2400
x908
1725K
Kingdom of Criticism
data structures
,
dsu
2500
x668
1725J
Journey
dp
,
trees
2500
x376
1725I
Imitating the Key Tree
combinatorics
,
dsu
,
trees
2800
x197
1725H
Hot Black Hot White
constructive algorithms
,
math
1800
x2593
1725F
Field Photography
bitmasks
,
data structures
,
sortings
2100
x985
1725E
Electrical Efficiency
combinatorics
,
data structures
,
dp
,
math
,
number theory
,
trees
2500
x461
1725D
Deducing Sortability
binary search
,
bitmasks
,
math
2900
x122
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1615
1722F
L-shapes
dfs and similar
,
implementation
1700
x6898
1722E
Counting Rectangles
brute force
,
data structures
,
dp
,
implementation
1600
x10740
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x399
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1960
1721D
Maximum AND
bitmasks
,
dfs and similar
,
divide and conquer
,
greedy
,
sortings
1800
x6589
1720E
Misha and Paintings
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
2700
x800
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1832
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5958
1718F
Burenka, an Array and Queries
data structures
,
math
,
number theory
3300
x153
1718E
Impressionism
constructive algorithms
,
graphs
,
implementation
,
math
3500
x109
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x303
1718C
Tonya and Burenka-179
data structures
,
greedy
,
math
,
number theory
2400
x1607
1718B
Fibonacci Strings
greedy
,
implementation
,
math
,
number theory
2000
x2989
1718A2
Burenka and Traditions (hard version)
data structures
,
dp
,
greedy
1900
x5208
1718A1
Burenka and Traditions (easy version)
dp
,
greedy
1800
x5733
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x527
1717E
Madoka and The Best University
math
,
number theory
2200
x2697
1717D
Madoka and The Corruption Scheme
combinatorics
,
constructive algorithms
,
greedy
,
math
1900
x4395
1716F
Bags with Balls
combinatorics
,
dp
,
math
,
number theory
2500
x1042
1716E
Swap and Maximum Block
bitmasks
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
2500
x1086
1716D
Chip Move
brute force
,
dp
,
math
2000
x5244
1716C
Robot in a Hallway
data structures
,
dp
,
greedy
,
implementation
,
ternary search
2000
x4177
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