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Educational Codeforces Round 167 (Rated for Div. 2)
21:06:34
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Difficulty:
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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
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Status
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Custom test
Problems
#
Name
105B
Dark Assembly
brute force
,
probabilities
1800
x803
105A
Transmigration
implementation
1700
x1816
104A
Blackjack
implementation
800
x15032
103E
Buying Sets
flows
,
graph matchings
2900
x829
103D
Time to Raid Cowavans
brute force
,
data structures
,
sortings
2100
x2004
103C
Russian Roulette
constructive algorithms
,
greedy
1900
x939
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x8601
103A
Testing Pants for Sadness
greedy
,
implementation
,
math
1100
x5902
102B
Sum of Digits
implementation
1000
x25117
102A
Clothes
brute force
1200
x2943
101E
Candies and Stones
divide and conquer
,
dp
2500
x480
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x672
101C
Vectors
implementation
,
math
2000
x688
101B
Buses
binary search
,
data structures
,
dp
1700
x2517
101A
Homework
greedy
1200
x3734
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x61
100I
Rotation
*special problem
,
geometry
,
math
1500
x342
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x75
100G
Name the album
*special problem
,
data structures
,
implementation
1800
x110
100F
Polynom
*special problem
,
implementation
1800
x133
100E
Lamps in a Line
*special problem
,
math
1600
x268
100D
World of Mouth
*special problem
,
strings
1500
x298
100C
A+B
*special problem
,
implementation
1400
x519
100B
Friendly Numbers
*special problem
,
implementation
1500
x537
100A
Carpeting the Room
*special problem
,
implementation
1100
x895
99B
Help Chef Gerasim
implementation
,
sortings
1300
x2915
99A
Help Far Away Kingdom
strings
800
x6566
98E
Help Shrek and Donkey
dp
,
games
,
math
,
probabilities
2700
x459
98D
Help Monks
constructive algorithms
2500
x181
98C
Help Greg the Dwarf
geometry
,
ternary search
2500
x302
98B
Help King
implementation
,
probabilities
,
trees
2200
x117
98A
Help Victoria the Wise
brute force
,
implementation
1700
x1173
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x373
97D
Robot in Basement
bitmasks
,
brute force
,
implementation
2700
x242
97C
Winning Strategy
binary search
,
graphs
,
math
,
shortest paths
2400
x300
97B
Superset
constructive algorithms
,
divide and conquer
2300
x808
97A
Domino
brute force
,
implementation
2400
x254
96B
Lucky Numbers (easy)
binary search
,
bitmasks
,
brute force
1300
x14731
96A
Football
implementation
,
strings
900
x151808
95E
Lucky Country
dp
,
dsu
,
graphs
2500
x1411
95D
Horse Races
dp
,
math
2500
x419
95C
Volleyball
shortest paths
1900
x2714
95B
Lucky Numbers
dp
,
greedy
1800
x1184
95A
Hockey
implementation
,
strings
1600
x1649
94B
Friends
graphs
,
implementation
,
math
1300
x4534
94A
Restoring Password
implementation
,
strings
900
x10247
93E
Lostborn
dp
,
math
,
number theory
2600
x439
93D
Flags
dp
,
math
,
matrices
2500
x336
93C
Azembler
brute force
,
implementation
2500
x412
93B
End of Exams
greedy
1900
x906
93A
Frames
implementation
1700
x1915
92B
Binary Number
greedy
1300
x4732
92A
Chips
implementation
,
math
800
x18387
91E
Igloo Skyscraper
data structures
,
geometry
2500
x587
91D
Grocer's Problem
constructive algorithms
,
graphs
,
greedy
2600
x264
91C
Ski Base
combinatorics
,
dsu
,
graphs
2300
x868
91B
Queue
binary search
,
data structures
1500
x6604
91A
Newspaper Headline
greedy
,
strings
1500
x3518
90B
African Crossword
implementation
,
strings
1100
x5203
90A
Cableway
greedy
,
math
1000
x4550
89E
Fire and Ice
greedy
2900
x99
89D
Space mines
geometry
2500
x231
89C
Chip Play
brute force
,
data structures
,
implementation
2300
x610
89B
Widget Library
dp
,
expression parsing
,
graphs
,
implementation
2300
x511
89A
Robbery
greedy
1800
x1457
88B
Keyboard
implementation
1500
x4435
88A
Chord
brute force
,
implementation
1200
x3761
87E
Mogohu-Rea Idol
geometry
2600
x555
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x857
87C
Interesting Game
dp
,
games
,
math
2000
x1313
87B
Vasya and Types
implementation
,
strings
1800
x1119
87A
Trains
implementation
,
math
1500
x5226
86E
Long sequence
brute force
,
math
,
matrices
2700
x180
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x12954
86C
Genetic engineering
dp
,
string suffix structures
,
trees
2500
x688
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x402
86A
Reflection
math
1600
x1347
85E
Guard Towers
binary search
,
dsu
,
geometry
,
graphs
,
sortings
2600
x933
85D
Sum of Medians
binary search
,
brute force
,
data structures
,
implementation
2300
x1930
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x523
85B
Embassy Queue
data structures
,
greedy
1800
x962
85A
Domino
constructive algorithms
,
implementation
1300
x1770
84C
Biathlon
binary search
,
implementation
1700
x1593
84A
Toy Army
math
,
number theory
900
x14684
83E
Two Subsequences
bitmasks
,
dp
2800
x462
83D
Numbers
dp
,
math
,
number theory
2400
x834
83C
Track
graphs
,
greedy
,
shortest paths
2400
x408
83B
Doctor
binary search
,
math
,
sortings
1800
x1627
83A
Magical Array
math
1300
x6128
82E
Corridor
geometry
2600
x217
82D
Two out of Three
dp
2000
x1939
82C
General Mobilization
data structures
,
dfs and similar
,
sortings
2000
x800
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2019
82A
Double Cola
implementation
,
math
1100
x29680
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x330
81D
Polycarp's Picture Gallery
constructive algorithms
,
greedy
2100
x640
81C
Average Score
greedy
,
math
,
sortings
1700
x1638
81B
Sequence Formatting
implementation
,
strings
1700
x1881
81A
Plug-in
implementation
1400
x10345
80B
Depression
geometry
,
math
1200
x4249
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