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Codeforces Round 1006 (Div. 3)
3 days
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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
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Status
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Custom test
Problems
#
Name
98D
Help Monks
constructive algorithms
2500
x189
98C
Help Greg the Dwarf
geometry
,
ternary search
2500
x315
98B
Help King
implementation
,
probabilities
,
trees
2200
x133
98A
Help Victoria the Wise
brute force
,
implementation
1700
x1221
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x389
97D
Robot in Basement
bitmasks
,
brute force
,
implementation
2700
x250
97C
Winning Strategy
binary search
,
graphs
,
math
,
shortest paths
2400
x307
97B
Superset
constructive algorithms
,
divide and conquer
2300
x877
97A
Domino
brute force
,
implementation
2400
x268
96B
Lucky Numbers (easy)
binary search
,
bitmasks
,
brute force
1300
x16205
96A
Football
implementation
,
strings
900
x167779
95E
Lucky Country
dp
,
dsu
,
graphs
2500
x1579
95D
Horse Races
dp
,
math
2500
x459
95C
Volleyball
shortest paths
1900
x2867
95B
Lucky Numbers
dp
,
greedy
1800
x1267
95A
Hockey
implementation
,
strings
1600
x1702
94B
Friends
graphs
,
implementation
,
math
1300
x4791
94A
Restoring Password
implementation
,
strings
900
x10911
93E
Lostborn
dp
,
math
,
number theory
2600
x506
93D
Flags
dp
,
math
,
matrices
2500
x361
93C
Azembler
brute force
,
implementation
2500
x434
93B
End of Exams
greedy
1900
x927
93A
Frames
implementation
1700
x1976
92B
Binary Number
greedy
1300
x4942
92A
Chips
implementation
,
math
800
x19419
91E
Igloo Skyscraper
data structures
,
geometry
2500
x616
91D
Grocer's Problem
constructive algorithms
,
graphs
,
greedy
2600
x278
91C
Ski Base
combinatorics
,
dsu
,
graphs
2300
x912
91B
Queue
binary search
,
data structures
1500
x6995
91A
Newspaper Headline
greedy
,
strings
1500
x3685
90B
African Crossword
implementation
,
strings
1100
x5401
90A
Cableway
greedy
,
math
1000
x4841
89E
Fire and Ice
greedy
2900
x104
89D
Space mines
geometry
2500
x242
89C
Chip Play
brute force
,
data structures
,
implementation
2300
x634
89B
Widget Library
dp
,
expression parsing
,
graphs
,
implementation
2300
x528
89A
Robbery
greedy
1800
x1495
88B
Keyboard
implementation
1500
x4832
88A
Chord
brute force
,
implementation
1200
x3865
87E
Mogohu-Rea Idol
geometry
2600
x616
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x921
87C
Interesting Game
dp
,
games
,
math
2000
x1448
87B
Vasya and Types
implementation
,
strings
1800
x1159
87A
Trains
implementation
,
math
1500
x5473
86E
Long sequence
brute force
,
math
,
matrices
2700
x193
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x14325
86C
Genetic engineering
dp
,
string suffix structures
,
trees
2500
x743
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x421
86A
Reflection
math
1600
x1463
85E
Guard Towers
binary search
,
dsu
,
geometry
,
graphs
,
sortings
2600
x999
85D
Sum of Medians
binary search
,
brute force
,
data structures
,
implementation
2300
x2091
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x573
85B
Embassy Queue
data structures
,
greedy
1800
x990
85A
Domino
constructive algorithms
,
implementation
1300
x1818
84C
Biathlon
binary search
,
implementation
1700
x1739
84A
Toy Army
math
,
number theory
900
x15488
83E
Two Subsequences
bitmasks
,
dp
2800
x488
83D
Numbers
dp
,
math
,
number theory
2400
x919
83C
Track
graphs
,
greedy
,
shortest paths
2400
x438
83B
Doctor
binary search
,
math
,
sortings
1800
x1723
83A
Magical Array
math
1300
x6356
82E
Corridor
geometry
2600
x219
82D
Two out of Three
dp
2000
x2105
82C
General Mobilization
data structures
,
dfs and similar
,
sortings
2000
x821
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2075
82A
Double Cola
implementation
,
math
1100
x30730
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x363
81D
Polycarp's Picture Gallery
constructive algorithms
,
greedy
2100
x668
81C
Average Score
greedy
,
math
,
sortings
1700
x1692
81B
Sequence Formatting
implementation
,
strings
1700
x1970
81A
Plug-in
implementation
1400
x11439
80B
Depression
geometry
,
math
1200
x4507
80A
Panoramix's Prediction
brute force
800
x56713
79E
Security System
math
2900
x138
79D
Password
bitmasks
,
dp
,
shortest paths
2800
x1215
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1863
79B
Colorful Field
implementation
,
sortings
1400
x7448
79A
Bus Game
greedy
1200
x4151
78E
Evacuation
flows
,
graphs
,
shortest paths
2300
x600
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x338
78C
Beaver Game
dp
,
games
,
number theory
2000
x1921
78B
Easter Eggs
constructive algorithms
,
implementation
1200
x14032
78A
Haiku
implementation
,
strings
800
x13552
77E
Martian Food
geometry
2800
x382
77D
Domino Carpet
dp
,
implementation
2300
x333
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x1050
77B
Falling Anvils
math
,
probabilities
1800
x2686
77A
Heroes
brute force
,
implementation
1400
x1786
76F
Tourist
binary search
,
data structures
,
dp
2300
x668
76E
Points
implementation
,
math
1700
x1739
76D
Plus and xor
dp
,
greedy
,
math
1700
x2117
76C
Mutation
bitmasks
,
dp
,
math
2700
x337
76B
Mice
greedy
,
two pointers
2100
x764
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1760
75E
Ship's Shortest Path
geometry
,
shortest paths
2400
x281
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1862
75C
Modified GCD
binary search
,
number theory
1600
x13278
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3354
75A
Life Without Zeros
implementation
1000
x27003
74E
Shift It!
constructive algorithms
2800
x170
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