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Codeforces Round 973 (Div. 2)
10:00:13
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→ Filter Problems
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
100B
Friendly Numbers
*special problem
,
implementation
1500
x542
100A
Carpeting the Room
*special problem
,
implementation
1100
x911
99B
Help Chef Gerasim
implementation
,
sortings
1300
x2956
99A
Help Far Away Kingdom
strings
800
x6663
98E
Help Shrek and Donkey
dp
,
games
,
math
,
probabilities
2700
x476
98D
Help Monks
constructive algorithms
2500
x182
98C
Help Greg the Dwarf
geometry
,
ternary search
2500
x306
98B
Help King
implementation
,
probabilities
,
trees
2200
x122
98A
Help Victoria the Wise
brute force
,
implementation
1700
x1181
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x381
97D
Robot in Basement
bitmasks
,
brute force
,
implementation
2700
x246
97C
Winning Strategy
binary search
,
graphs
,
math
,
shortest paths
2400
x302
97B
Superset
constructive algorithms
,
divide and conquer
2300
x817
97A
Domino
brute force
,
implementation
2400
x264
96B
Lucky Numbers (easy)
binary search
,
bitmasks
,
brute force
1300
x15289
96A
Football
implementation
,
strings
900
x156857
95E
Lucky Country
dp
,
dsu
,
graphs
2500
x1474
95D
Horse Races
dp
,
math
2500
x425
95C
Volleyball
shortest paths
1900
x2769
95B
Lucky Numbers
dp
,
greedy
1800
x1210
95A
Hockey
implementation
,
strings
1600
x1663
94B
Friends
graphs
,
implementation
,
math
1300
x4646
94A
Restoring Password
implementation
,
strings
900
x10478
93E
Lostborn
dp
,
math
,
number theory
2600
x498
93D
Flags
dp
,
math
,
matrices
2500
x347
93C
Azembler
brute force
,
implementation
2500
x419
93B
End of Exams
greedy
1900
x912
93A
Frames
implementation
1700
x1941
92B
Binary Number
greedy
1300
x4787
92A
Chips
implementation
,
math
800
x18698
91E
Igloo Skyscraper
data structures
,
geometry
2500
x600
91D
Grocer's Problem
constructive algorithms
,
graphs
,
greedy
2600
x270
91C
Ski Base
combinatorics
,
dsu
,
graphs
2300
x872
91B
Queue
binary search
,
data structures
1500
x6764
91A
Newspaper Headline
greedy
,
strings
1500
x3584
90B
African Crossword
implementation
,
strings
1100
x5281
90A
Cableway
greedy
,
math
1000
x4667
89E
Fire and Ice
greedy
2900
x99
89D
Space mines
geometry
2500
x232
89C
Chip Play
brute force
,
data structures
,
implementation
2300
x620
89B
Widget Library
dp
,
expression parsing
,
graphs
,
implementation
2300
x519
89A
Robbery
greedy
1800
x1471
88B
Keyboard
implementation
1500
x4625
88A
Chord
brute force
,
implementation
1200
x3813
87E
Mogohu-Rea Idol
geometry
2600
x583
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x882
87C
Interesting Game
dp
,
games
,
math
2000
x1343
87B
Vasya and Types
implementation
,
strings
1800
x1144
87A
Trains
implementation
,
math
1500
x5339
86E
Long sequence
brute force
,
math
,
matrices
2700
x188
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x13527
86C
Genetic engineering
dp
,
string suffix structures
,
trees
2500
x712
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x411
86A
Reflection
math
1600
x1367
85E
Guard Towers
binary search
,
dsu
,
geometry
,
graphs
,
sortings
2600
x949
85D
Sum of Medians
binary search
,
brute force
,
data structures
,
implementation
2300
x2026
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x535
85B
Embassy Queue
data structures
,
greedy
1800
x968
85A
Domino
constructive algorithms
,
implementation
1300
x1783
84C
Biathlon
binary search
,
implementation
1700
x1630
84A
Toy Army
math
,
number theory
900
x14923
83E
Two Subsequences
bitmasks
,
dp
2800
x471
83D
Numbers
dp
,
math
,
number theory
2400
x852
83C
Track
graphs
,
greedy
,
shortest paths
2400
x416
83B
Doctor
binary search
,
math
,
sortings
1800
x1641
83A
Magical Array
math
1300
x6200
82E
Corridor
geometry
2600
x217
82D
Two out of Three
dp
2000
x2005
82C
General Mobilization
data structures
,
dfs and similar
,
sortings
2000
x805
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2029
82A
Double Cola
implementation
,
math
1100
x30095
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x340
81D
Polycarp's Picture Gallery
constructive algorithms
,
greedy
2100
x644
81C
Average Score
greedy
,
math
,
sortings
1700
x1659
81B
Sequence Formatting
implementation
,
strings
1700
x1947
81A
Plug-in
implementation
1400
x10639
80B
Depression
geometry
,
math
1200
x4385
80A
Panoramix's Prediction
brute force
800
x52983
79E
Security System
math
2900
x131
79D
Password
bitmasks
,
dp
,
shortest paths
2800
x1123
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1775
79B
Colorful Field
implementation
,
sortings
1400
x7133
79A
Bus Game
greedy
1200
x4041
78E
Evacuation
flows
,
graphs
,
shortest paths
2300
x540
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x310
78C
Beaver Game
dp
,
games
,
number theory
2000
x1866
78B
Easter Eggs
constructive algorithms
,
implementation
1200
x13429
78A
Haiku
implementation
,
strings
800
x12400
77E
Martian Food
geometry
2800
x372
77D
Domino Carpet
dp
,
implementation
2300
x324
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x998
77B
Falling Anvils
math
,
probabilities
1800
x2608
77A
Heroes
brute force
,
implementation
1400
x1770
76F
Tourist
binary search
,
data structures
,
dp
2300
x630
76E
Points
implementation
,
math
1700
x1706
76D
Plus and xor
dp
,
greedy
,
math
1700
x2057
76C
Mutation
bitmasks
,
dp
,
math
2700
x310
76B
Mice
greedy
,
two pointers
2100
x744
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1580
75E
Ship's Shortest Path
geometry
,
shortest paths
2400
x276
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