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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
43:30:19
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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
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
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Status
Standings
Custom test
Problems
#
Name
1091F
New Year and the Mallard Expedition
constructive algorithms
,
greedy
2600
x827
1091B
New Year and the Treasure Geolocation
brute force
,
constructive algorithms
,
greedy
,
implementation
1200
x10692
1090F
How to Learn You Score
constructive algorithms
,
interactive
2600
x326
1090D
Similar Arrays
constructive algorithms
1800
x2107
1090C
New Year Presents
constructive algorithms
,
data structures
2400
x504
1089M
Minegraphed
constructive algorithms
,
graphs
2400
x600
1089E
Easy Chess
constructive algorithms
1700
x1992
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2873
1088C
Ehab and a 2-operation task
constructive algorithms
,
greedy
,
math
1400
x8086
1088A
Ehab and another construction problem
brute force
,
constructive algorithms
800
x16896
1085D
Minimum Diameter Tree
constructive algorithms
,
implementation
,
trees
1700
x5452
1082D
Maximum Diameter Graph
constructive algorithms
,
graphs
,
implementation
1800
x3824
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x475
1081E
Missing Numbers
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1900
x2601
1081B
Farewell Party
constructive algorithms
,
implementation
1500
x4465
1081A
Definite Game
constructive algorithms
,
math
800
x12124
1080D
Olya and magical square
constructive algorithms
,
implementation
,
math
2000
x1561
1078E
Negative Time Summation
constructive algorithms
3400
x88
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x69
1070L
Odd Federalization
constructive algorithms
2600
x302
1068C
Colored Rooks
constructive algorithms
,
graphs
1700
x3194
1067C
Knights
constructive algorithms
2600
x661
1065B
Vasya and Isolated Vertices
constructive algorithms
,
graphs
1300
x10961
1063E
Lasers and Mirrors
constructive algorithms
,
math
3000
x356
1063C
Dwarves, Hats and Extrasensory Abilities
binary search
,
constructive algorithms
,
geometry
,
interactive
1900
x3070
1063A
Oh Those Palindromes
constructive algorithms
,
strings
1300
x10389
1060H
Sophisticated Device
constructive algorithms
3300
x213
1059C
Sequence Transformation
constructive algorithms
,
math
1600
x7171
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x5951
1054G
New Road Network
constructive algorithms
,
greedy
,
math
3300
x299
1054E
Chips Puzzle
constructive algorithms
,
implementation
,
math
2400
x488
1054C
Candies Distribution
constructive algorithms
,
implementation
1500
x4294
1053E
Euler tour
constructive algorithms
,
trees
3500
x205
1045E
Ancient civilizations
constructive algorithms
,
geometry
3200
x234
1043E
Train Hard, Win Easy
constructive algorithms
,
greedy
,
math
,
sortings
1900
x2780
1043C
Smallest Word
constructive algorithms
,
greedy
,
implementation
1500
x6900
1042C
Array Product
constructive algorithms
,
greedy
,
math
1700
x4729
1041E
Tree Reconstruction
constructive algorithms
,
data structures
,
graphs
,
greedy
1900
x3604
1039A
Timetable
constructive algorithms
,
data structures
,
greedy
,
math
2300
x789
1038B
Non-Coprime Partition
constructive algorithms
,
math
1100
x13654
1037A
Packets
constructive algorithms
,
greedy
,
math
1300
x11221
1034B
Little C Loves 3 II
brute force
,
constructive algorithms
,
flows
,
graph matchings
2200
x2156
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x655
1032C
Playing Piano
constructive algorithms
,
dp
1700
x3996
1031E
Triple Flips
constructive algorithms
2600
x533
1028E
Restore Array
constructive algorithms
2400
x1146
1028B
Unnatural Conditions
constructive algorithms
,
math
1200
x9120
1025G
Company Acquisitions
constructive algorithms
,
math
3200
x736
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x571
1025C
Plasticine zebra
constructive algorithms
,
implementation
1600
x6144
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x2038
1023D
Array Restoration
constructive algorithms
,
data structures
1700
x4048
1019C
Sergey's problem
constructive algorithms
,
graphs
3000
x1125
1017C
The Phone Number
constructive algorithms
,
greedy
1600
x6026
1016D
Vasya And The Matrix
constructive algorithms
,
flows
,
math
1800
x4720
1015D
Walking Between Houses
constructive algorithms
,
greedy
1600
x8252
1012D
AB-Strings
constructive algorithms
,
strings
2800
x381
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x4038
1009D
Relatively Prime Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
math
1700
x6268
1004D
Sonya and Matrix
brute force
,
constructive algorithms
,
implementation
2300
x1428
1004C
Sonya and Robots
constructive algorithms
,
implementation
1400
x7543
1004B
Sonya and Exhibition
constructive algorithms
,
greedy
,
implementation
,
math
1300
x9517
1003E
Tree Constructing
constructive algorithms
,
graphs
2100
x2720
1003B
Binary String Constructing
constructive algorithms
1300
x11406
998A
Balloons
constructive algorithms
,
implementation
1000
x9642
995A
Tesla
constructive algorithms
,
implementation
2100
x1701
990D
Graph And Its Complement
constructive algorithms
,
graphs
,
implementation
1700
x3848
989C
A Mist of Florescence
constructive algorithms
,
graphs
1800
x3820
989B
A Tide of Riverscape
constructive algorithms
,
strings
1200
x7064
985D
Sand Fortress
binary search
,
constructive algorithms
,
math
2100
x2568
982A
Row
brute force
,
constructive algorithms
1200
x9101
980B
Marlin
constructive algorithms
1600
x4701
976D
Degree Set
constructive algorithms
,
graphs
,
implementation
2500
x688
963B
Destruction of a Tree
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x2845
962E
Byteland, Berland and Disputed Cities
constructive algorithms
,
greedy
2200
x1091
962B
Students in Railway Carriage
constructive algorithms
,
greedy
,
implementation
1300
x7716
960C
Subsequence Counting
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1700
x3935
959D
Mahmoud and Ehab and another array construction task
constructive algorithms
,
greedy
,
math
,
number theory
1900
x3101
959C
Mahmoud and Ehab and the wrong algorithm
constructive algorithms
,
trees
1500
x5792
952G
Puzzling Language
constructive algorithms
2200
x238
949B
A Leapfrog in the Array
constructive algorithms
,
math
1700
x3732
940C
Phone Numbers
constructive algorithms
,
implementation
,
strings
1500
x5902
938C
Constructing Tests
binary search
,
brute force
,
constructive algorithms
1700
x3324
936C
Lock Puzzle
constructive algorithms
,
implementation
,
strings
2300
x1182
934B
A Prosperous Lot
constructive algorithms
,
implementation
1200
x8709
933E
A Preponderant Reunion
constructive algorithms
,
dp
3200
x226
932C
Permutation Cycle
brute force
,
constructive algorithms
1600
x4031
932A
Palindromic Supersequence
constructive algorithms
800
x10311
931B
World Cup
constructive algorithms
,
implementation
1200
x7154
926E
Merge Equal Elements
constructive algorithms
,
data structures
1900
x931
925D
Aztec Catacombs
constructive algorithms
2600
x524
925C
Big Secret
constructive algorithms
,
math
2200
x1320
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x76
923D
Picking Strings
constructive algorithms
,
implementation
,
strings
2500
x1199
922F
Divisibility
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x646
916C
Jamie and Interesting Graph
constructive algorithms
,
graphs
,
shortest paths
1600
x5127
912B
New Year's Eve
bitmasks
,
constructive algorithms
,
number theory
1300
x12124
911F
Tree Destruction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x1754
911E
Stack Sorting
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x2562
911C
Three Garlands
brute force
,
constructive algorithms
1400
x7053
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