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IAEPC Preliminary Contest (Codeforces Round 999, Div. 1 + Div. 2)
02:22:58
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combine-tags-by-or
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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
1721C
Min-Max Array Transformation
binary search
,
greedy
,
two pointers
1400
x13619
1721B
Deadly Laser
implementation
1000
x22531
1721A
Image
greedy
,
implementation
800
x27241
1720E
Misha and Paintings
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
2700
x825
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1938
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x6142
1720C
Corners
greedy
,
implementation
1200
x17164
1720B
Interesting Sum
brute force
,
data structures
,
greedy
,
math
,
sortings
800
x21397
1720A
Burenka Plays with Fractions
math
,
number theory
900
x22727
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x13506
1719B
Mathematical Circus
constructive algorithms
,
math
800
x18646
1719A
Chip Game
games
,
math
800
x25755
1718F
Burenka, an Array and Queries
data structures
,
math
,
number theory
3300
x165
1718E
Impressionism
constructive algorithms
,
graphs
,
implementation
,
math
3500
x121
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x318
1718C
Tonya and Burenka-179
data structures
,
greedy
,
math
,
number theory
2400
x1651
1718B
Fibonacci Strings
greedy
,
implementation
,
math
,
number theory
2000
x3089
1718A2
Burenka and Traditions (hard version)
data structures
,
dp
,
greedy
1900
x5402
1718A1
Burenka and Traditions (easy version)
dp
,
greedy
1800
x5927
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x543
1717E
Madoka and The Best University
math
,
number theory
2200
x2847
1717D
Madoka and The Corruption Scheme
combinatorics
,
constructive algorithms
,
greedy
,
math
1900
x4486
1717C
Madoka and Formal Statement
greedy
1300
x14871
1717B
Madoka and Underground Competitions
constructive algorithms
,
implementation
1100
x14991
1717A
Madoka and Strange Thoughts
math
,
number theory
800
x19692
1716F
Bags with Balls
combinatorics
,
dp
,
math
,
number theory
2500
x1103
1716E
Swap and Maximum Block
bitmasks
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
2500
x1116
1716D
Chip Move
brute force
,
dp
,
math
2000
x5424
1716C
Robot in a Hallway
data structures
,
dp
,
greedy
,
implementation
,
ternary search
2000
x4276
1716B
Permutation Chain
constructive algorithms
,
math
800
x21532
1716A
2-3 Moves
greedy
,
math
800
x33463
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x533
1715E
Long Way Home
data structures
,
divide and conquer
,
dp
,
geometry
,
graphs
,
greedy
,
shortest paths
2400
x1797
1715D
2+ doors
2-sat
,
bitmasks
,
graphs
,
greedy
1900
x5259
1715C
Monoblock
combinatorics
,
data structures
,
implementation
,
math
1700
x8803
1715B
Beautiful Array
constructive algorithms
,
greedy
,
math
1000
x23056
1715A
Crossmarket
constructive algorithms
,
greedy
,
math
800
x23688
1714G
Path Prefixes
binary search
,
data structures
,
dfs and similar
,
trees
1700
x7897
1714F
Build a Tree and That Is It
constructive algorithms
,
implementation
,
trees
1900
x3321
1714E
Add Modulo 10
brute force
,
math
,
number theory
1400
x17440
1714D
Color with Occurrences
brute force
,
data structures
,
dp
,
greedy
,
strings
1600
x9330
1714C
Minimum Varied Number
greedy
800
x31478
1714B
Remove Prefix
data structures
,
greedy
,
implementation
800
x30907
1714A
Everyone Loves to Sleep
implementation
,
math
900
x30344
1713F
Lost Array
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
2900
x557
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1754
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5786
1713C
Build Permutation
constructive algorithms
,
dp
,
math
1200
x17709
1713B
Optimal Reduction
constructive algorithms
,
sortings
1000
x21601
1713A
Traveling Salesman Problem
geometry
,
greedy
,
implementation
800
x22146
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x340
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x1393
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2232
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4618
1712C
Sort Zero
greedy
,
sortings
1100
x20170
1712B
Woeful Permutation
constructive algorithms
,
greedy
,
number theory
800
x21775
1712A
Wonderful Permutation
greedy
,
implementation
800
x24280
1711B
Party
brute force
,
graphs
1300
x13575
1711A
Perfect Permutation
constructive algorithms
800
x25370
1710E
Two Arrays
binary search
,
games
,
graph matchings
2400
x522
1710D
Recover the Tree
constructive algorithms
,
trees
3400
x432
1710C
XOR Triangle
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
2500
x1414
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x2524
1710A
Color the Picture
constructive algorithms
,
greedy
,
math
1500
x11102
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x577
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2869
1709D
Rorororobot
binary search
,
data structures
,
greedy
,
math
1700
x8604
1709C
Recover an RBS
constructive algorithms
,
greedy
,
implementation
,
strings
1800
x8999
1709B
Also Try Minecraft
data structures
,
dp
,
implementation
900
x23235
1709A
Three Doors
brute force
,
greedy
,
implementation
,
math
800
x29998
1708B
Difference of GCDs
constructive algorithms
,
math
1100
x21544
1708A
Difference Operations
greedy
,
math
800
x21899
1707F
Bugaboo
bitmasks
,
constructive algorithms
,
dp
,
number theory
3500
x157
1707E
Replace
binary search
,
data structures
3500
x743
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x685
1707C
DFS Trees
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1583
1707B
Difference Array
brute force
,
data structures
,
implementation
,
sortings
1900
x5857
1707A
Doremy's IQ
binary search
,
constructive algorithms
,
greedy
,
implementation
1600
x13927
1706E
Qpwoeirut and Vertices
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
trees
2300
x2832
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1744
1706D1
Chopping Carrots (Easy Version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
number theory
1700
x7134
1706C
Qpwoeirut And The City
dp
,
flows
,
greedy
,
implementation
1400
x15194
1706B
Making Towers
dp
,
greedy
,
math
1100
x16758
1706A
Another String Minimization Problem
2-sat
,
constructive algorithms
,
greedy
,
string suffix structures
,
strings
800
x23160
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x625
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x2134
1705D
Mark and Lightbulbs
combinatorics
,
constructive algorithms
,
greedy
,
math
,
sortings
1800
x6475
1705C
Mark and His Unfinished Essay
brute force
,
implementation
1400
x13559
1705B
Mark the Dust Sweeper
constructive algorithms
,
greedy
,
implementation
900
x23522
1705A
Mark the Photographer
greedy
,
sortings
800
x25496
1704H2
Game of AI (hard version)
combinatorics
,
fft
,
math
3500
x93
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x189
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x115
1704F
Colouring Game
constructive algorithms
,
dp
,
games
2600
x1077
1704E
Count Seconds
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
2200
x2412
1704D
Magical Array
constructive algorithms
,
hashing
,
implementation
,
math
1900
x5113
1704C
Virus
greedy
,
implementation
,
sortings
1200
x16879
1704B
Luke is a Foodie
brute force
,
greedy
,
implementation
1000
x19331
1704A
Two 0-1 Sequences
constructive algorithms
,
greedy
800
x16141
1703G
Good Key, Bad Key
bitmasks
,
brute force
,
dp
,
greedy
,
math
1600
x11121
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