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Rayan
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Before contest
Codeforces Round 995 (Div. 3)
12:43:53
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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
#
Name
94A
Restoring Password
implementation
,
strings
900
x10738
93E
Lostborn
dp
,
math
,
number theory
2600
x503
93D
Flags
dp
,
math
,
matrices
2500
x357
93C
Azembler
brute force
,
implementation
2500
x426
93B
End of Exams
greedy
1900
x924
93A
Frames
implementation
1700
x1968
92B
Binary Number
greedy
1300
x4901
92A
Chips
implementation
,
math
800
x19168
91E
Igloo Skyscraper
data structures
,
geometry
2500
x611
91D
Grocer's Problem
constructive algorithms
,
graphs
,
greedy
2600
x277
91C
Ski Base
combinatorics
,
dsu
,
graphs
2300
x897
91B
Queue
binary search
,
data structures
1500
x6896
91A
Newspaper Headline
greedy
,
strings
1500
x3636
90B
African Crossword
implementation
,
strings
1100
x5372
90A
Cableway
greedy
,
math
1000
x4776
89E
Fire and Ice
greedy
2900
x102
89D
Space mines
geometry
2500
x241
89C
Chip Play
brute force
,
data structures
,
implementation
2300
x625
89B
Widget Library
dp
,
expression parsing
,
graphs
,
implementation
2300
x527
89A
Robbery
greedy
1800
x1485
88B
Keyboard
implementation
1500
x4747
88A
Chord
brute force
,
implementation
1200
x3846
87E
Mogohu-Rea Idol
geometry
2600
x611
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x914
87C
Interesting Game
dp
,
games
,
math
2000
x1399
87B
Vasya and Types
implementation
,
strings
1800
x1156
87A
Trains
implementation
,
math
1500
x5423
86E
Long sequence
brute force
,
math
,
matrices
2700
x191
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x14078
86C
Genetic engineering
dp
,
string suffix structures
,
trees
2500
x734
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x417
86A
Reflection
math
1600
x1430
85E
Guard Towers
binary search
,
dsu
,
geometry
,
graphs
,
sortings
2600
x987
85D
Sum of Medians
binary search
,
brute force
,
data structures
,
implementation
2300
x2063
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x546
85B
Embassy Queue
data structures
,
greedy
1800
x984
85A
Domino
constructive algorithms
,
implementation
1300
x1801
84C
Biathlon
binary search
,
implementation
1700
x1723
84A
Toy Army
math
,
number theory
900
x15250
83E
Two Subsequences
bitmasks
,
dp
2800
x482
83D
Numbers
dp
,
math
,
number theory
2400
x894
83C
Track
graphs
,
greedy
,
shortest paths
2400
x436
83B
Doctor
binary search
,
math
,
sortings
1800
x1708
83A
Magical Array
math
1300
x6305
82E
Corridor
geometry
2600
x218
82D
Two out of Three
dp
2000
x2069
82C
General Mobilization
data structures
,
dfs and similar
,
sortings
2000
x813
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2068
82A
Double Cola
implementation
,
math
1100
x30487
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x354
81D
Polycarp's Picture Gallery
constructive algorithms
,
greedy
2100
x656
81C
Average Score
greedy
,
math
,
sortings
1700
x1674
81B
Sequence Formatting
implementation
,
strings
1700
x1959
81A
Plug-in
implementation
1400
x11188
80B
Depression
geometry
,
math
1200
x4470
80A
Panoramix's Prediction
brute force
800
x55173
79E
Security System
math
2900
x138
79D
Password
bitmasks
,
dp
,
shortest paths
2800
x1203
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1821
79B
Colorful Field
implementation
,
sortings
1400
x7344
79A
Bus Game
greedy
1200
x4115
78E
Evacuation
flows
,
graphs
,
shortest paths
2300
x594
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x332
78C
Beaver Game
dp
,
games
,
number theory
2000
x1896
78B
Easter Eggs
constructive algorithms
,
implementation
1200
x13792
78A
Haiku
implementation
,
strings
800
x13137
77E
Martian Food
geometry
2800
x381
77D
Domino Carpet
dp
,
implementation
2300
x332
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x1041
77B
Falling Anvils
math
,
probabilities
1800
x2640
77A
Heroes
brute force
,
implementation
1400
x1784
76F
Tourist
binary search
,
data structures
,
dp
2300
x648
76E
Points
implementation
,
math
1700
x1725
76D
Plus and xor
dp
,
greedy
,
math
1700
x2085
76C
Mutation
bitmasks
,
dp
,
math
2700
x317
76B
Mice
greedy
,
two pointers
2100
x753
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1618
75E
Ship's Shortest Path
geometry
,
shortest paths
2400
x280
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1837
75C
Modified GCD
binary search
,
number theory
1600
x13009
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3332
75A
Life Without Zeros
implementation
1000
x26532
74E
Shift It!
constructive algorithms
2800
x155
74D
Hanger
data structures
2400
x373
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x1290
74B
Train
dp
,
games
,
greedy
1500
x1554
74A
Room Leader
implementation
1000
x5226
73F
Plane of Tanks
brute force
,
geometry
2900
x81
73E
Morrowindows
math
,
number theory
2400
x365
73D
FreeDiv
dfs and similar
,
graphs
,
greedy
2200
x643
73C
LionAge II
dp
1800
x2138
73B
Need For Brake
binary search
,
greedy
,
sortings
2000
x509
73A
The Elder Trolls IV: Oblivon
greedy
,
math
1600
x1380
72I
Goofy Numbers
*special problem
,
implementation
1500
x465
72H
Reverse It!
*special problem
,
implementation
1600
x267
72G
Fibonacci army
*special problem
,
dp
1000
x2347
72F
Oil
*special problem
,
greedy
,
math
1900
x120
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x173
72D
Perse-script
*special problem
,
expression parsing
2300
x76
72C
Extraordinarily Nice Numbers
*special problem
,
math
1200
x929
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