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Codeforces Round 1101 (Div. 2)
01:22:55
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Difficulty:
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constructive algorithms
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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Problems
#
Name
2109C2
Hacking Numbers (Medium Version)
constructive algorithms
,
interactive
,
math
,
number theory
1700
x8727
2109C1
Hacking Numbers (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
,
number theory
1500
x11530
2108E
Spruce Dispute
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
shortest paths
,
trees
2600
x898
2108B
SUMdamental Decomposition
bitmasks
,
constructive algorithms
,
greedy
,
implementation
,
math
1300
x14639
2107E
Ain and Apple Tree
binary search
,
constructive algorithms
,
greedy
,
math
,
trees
2600
x946
2107C
Maximum Subarray Sum
binary search
,
constructive algorithms
,
dp
,
implementation
,
math
1500
x12196
2106G1
Baudelaire (easy version)
binary search
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
trees
2200
x1624
2106B
St. Chroma
constructive algorithms
,
greedy
,
math
900
x28518
2104C
Card Game
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1100
x17493
2103E
Keep the Sum
constructive algorithms
,
implementation
,
two pointers
2600
x611
2103D
Local Construction
constructive algorithms
,
dfs and similar
,
implementation
,
two pointers
2000
x4009
2102A
Dinner Time
constructive algorithms
,
math
900
x21606
2101A
Mex in the Grid
constructive algorithms
,
implementation
1300
x13747
2096G
Wonderful Guessing Game
bitmasks
,
constructive algorithms
,
interactive
3200
x430
2096D
Wonderful Lightbulbs
combinatorics
,
constructive algorithms
,
math
2000
x5639
2096A
Wonderful Sticks
constructive algorithms
,
greedy
800
x20655
2094F
Trulimero Trulicina
constructive algorithms
1600
x11528
2094B
Bobritto Bandito
brute force
,
constructive algorithms
800
x33334
2092F
Andryusha and CCB
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
2900
x432
2092E
She knows...
combinatorics
,
constructive algorithms
,
graphs
,
math
2100
x3867
2092D
Mishkin Energizer
brute force
,
constructive algorithms
,
greedy
,
implementation
,
strings
1800
x6917
2092C
Asuna and the Mosquitoes
constructive algorithms
,
greedy
,
math
1200
x22740
2092B
Lady Bug
brute force
,
constructive algorithms
,
implementation
,
math
1000
x25011
2091G
Gleb and Boating
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
greedy
,
math
,
number theory
,
shortest paths
2300
x1536
2091C
Combination Lock
constructive algorithms
,
greedy
1000
x29002
2089D
Conditional Operators
constructive algorithms
3200
x191
2089A
Simple Permutation
constructive algorithms
,
number theory
1700
x7260
2086F
Online Palindrome
brute force
,
constructive algorithms
,
interactive
3000
x142
2086E
Zebra-like Numbers
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
math
2400
x1675
2085E
Serval and Modulo
constructive algorithms
,
math
,
number theory
2200
x3176
2085C
Serval and The Formula
bitmasks
,
constructive algorithms
,
dp
,
greedy
1600
x13724
2085B
Serval and Final MEX
constructive algorithms
,
implementation
1200
x17205
2085A
Serval and String Theory
constructive algorithms
,
implementation
900
x23653
2084F
Skyscape
constructive algorithms
,
data structures
,
greedy
2900
x510
2084D
Arcology On Permafrost
binary search
,
brute force
,
constructive algorithms
,
greedy
,
math
1600
x8926
2084C
You Soared Afar With Grace
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x11802
2084A
Max and Mod
constructive algorithms
,
math
800
x17469
2082A
Binary Matrix
constructive algorithms
,
greedy
800
x11242
2081F
Hot Matrix
constructive algorithms
,
math
3300
x142
2081D
MST in Modulo Graph
constructive algorithms
,
dsu
,
graphs
,
greedy
,
math
,
number theory
,
sortings
,
trees
2600
x1210
2081C
Quaternary Matrix
bitmasks
,
constructive algorithms
,
greedy
,
implementation
,
matrices
2700
x360
2080A
Strong Connectivity Strikes Back
*special problem
,
constructive algorithms
,
graphs
3200
x46
2078B
Vicious Labyrinth
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1100
x18415
2077F
AND x OR
bitmasks
,
constructive algorithms
,
dp
3300
x266
2077E
Another Folding Strip
combinatorics
,
constructive algorithms
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
2700
x613
2077B
Finding OR Sum
bitmasks
,
constructive algorithms
,
implementation
,
interactive
,
math
1900
x3683
2077A
Breach of Faith
constructive algorithms
,
greedy
,
math
,
sortings
1500
x14686
2075B
Array Recoloring
constructive algorithms
,
greedy
1300
x18991
2072F
Goodbye, Banker Life
2-sat
,
bitmasks
,
combinatorics
,
constructive algorithms
,
fft
,
math
,
number theory
1700
x8519
2072E
Do You Love Your Hero and His Two-Hit Multi-Target Attacks?
binary search
,
brute force
,
constructive algorithms
,
dp
,
geometry
,
greedy
,
math
1500
x12368
2072C
Creating Keys for StORages Has Become My Main Skill
bitmasks
,
constructive algorithms
,
greedy
1200
x19688
2072B
Having Been a Treasurer in the Past, I Help Goblins Deceive
combinatorics
,
constructive algorithms
,
strings
900
x31085
2071D2
Infinite Sequence (Hard Version)
bitmasks
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
implementation
,
math
2500
x1110
2071C
Trapmigiano Reggiano
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1700
x9773
2071B
Perfecto
brute force
,
constructive algorithms
,
greedy
,
math
1100
x20984
2070E
Game with Binary String
constructive algorithms
,
data structures
,
divide and conquer
,
games
,
greedy
,
math
2200
x1873
2069E
A, B, AB and BA
constructive algorithms
,
greedy
,
sortings
,
strings
2300
x1928
2068H
Statues
constructive algorithms
,
greedy
,
math
2700
x410
2068B
Urban Planning
constructive algorithms
3100
x145
2068A
Condorcet Elections
constructive algorithms
,
graphs
,
greedy
,
probabilities
2300
x1009
2067A
Adjacent Digit Sums
brute force
,
constructive algorithms
,
math
800
x25768
2066F
Curse
constructive algorithms
,
dp
,
math
3300
x73
2066B
White Magic
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
1900
x5508
2065E
Skibidus and Rizz
constructive algorithms
,
greedy
,
strings
1600
x12078
2065A
Skibidus and Amog'u
brute force
,
constructive algorithms
,
greedy
,
implementation
,
strings
800
x56015
2064C
Remove the Ends
brute force
,
constructive algorithms
,
dp
,
greedy
1300
x17878
2064B
Variety is Discouraged
binary search
,
constructive algorithms
,
greedy
,
two pointers
1100
x20207
2063B
Subsequence Update
constructive algorithms
,
data structures
,
greedy
,
sortings
1100
x23299
2062F
Traveling Salescat
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
math
,
sortings
2900
x615
2062A
String
constructive algorithms
,
greedy
,
math
,
strings
800
x28337
2061G
Kevin and Teams
constructive algorithms
,
graphs
,
interactive
2900
x522
2059E2
Stop Gaming (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
hashing
,
strings
2900
x351
2059E1
Stop Gaming (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
hashing
,
strings
2500
x893
2059C
Customer Service
brute force
,
constructive algorithms
,
graph matchings
,
greedy
,
math
,
sortings
1600
x12635
2059B
Cost of the Array
brute force
,
constructive algorithms
,
greedy
,
math
1300
x18870
2059A
Milya and Two Arrays
constructive algorithms
,
greedy
,
sortings
800
x29258
2057G
Secret Message
constructive algorithms
,
dfs and similar
,
math
3000
x741
2057C
Trip to the Olympiad
bitmasks
,
constructive algorithms
,
greedy
,
math
1500
x13888
2057A
MEX Table
constructive algorithms
,
math
800
x27566
2056C
Palindromic Subsequences
brute force
,
constructive algorithms
,
math
1200
x19562
2056A
Shape Perimeter
constructive algorithms
,
math
800
x26836
2055E
Haystacks
brute force
,
constructive algorithms
,
data structures
,
greedy
,
sortings
2800
x488
2055C
The Trail
brute force
,
constructive algorithms
,
greedy
,
math
,
two pointers
1400
x17353
2055B
Crafting
constructive algorithms
,
greedy
,
sortings
1000
x27415
2055A
Two Frogs
constructive algorithms
,
games
,
greedy
,
math
800
x33729
2053H
Delicate Anti-monotonous Operations
constructive algorithms
,
implementation
3500
x78
2052F
Fix Flooded Floor
constructive algorithms
,
dp
,
graphs
1700
x3786
2052C
Cactus without Bridges
constructive algorithms
,
math
3500
x59
2052A
Adrenaline Rush
constructive algorithms
1600
x4284
2051C
Preparing for the Exam
constructive algorithms
,
implementation
1000
x28162
2049E
Broken Queries
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
implementation
,
interactive
2400
x1599
2049C
MEX Cycle
brute force
,
constructive algorithms
,
greedy
,
implementation
1500
x13736
2049B
pspspsps
brute force
,
constructive algorithms
,
graph matchings
,
implementation
1300
x19014
2048I1
Kevin and Puzzle (Easy Version)
constructive algorithms
3500
x106
2048E
Kevin and Bipartite Graph
constructive algorithms
,
graphs
,
greedy
2000
x3525
2048B
Kevin and Permutation
constructive algorithms
,
greedy
900
x20740
2046F2
Yandex Cuneiform (Hard Version)
constructive algorithms
,
data structures
,
greedy
,
implementation
3500
x105
2046F1
Yandex Cuneiform (Easy Version)
constructive algorithms
,
data structures
,
greedy
3300
x137
2046E1
Cheops and a Contest (Easy Version)
constructive algorithms
,
greedy
2900
x233
2045L
Buggy DFS
constructive algorithms
3000
x161
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