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Codeforces Round 950 (Div. 3)
16:27:41
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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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Custom test
Problems
#
Name
92A
Chips
implementation
,
math
800
x18286
91E
Igloo Skyscraper
data structures
,
geometry
2500
x587
91D
Grocer's Problem
constructive algorithms
,
graphs
,
greedy
2600
x262
91C
Ski Base
combinatorics
,
dsu
,
graphs
2300
x864
91B
Queue
binary search
,
data structures
1500
x6561
91A
Newspaper Headline
greedy
,
strings
1500
x3506
90B
African Crossword
implementation
,
strings
1100
x5184
90A
Cableway
greedy
,
math
1000
x4530
89E
Fire and Ice
greedy
2900
x98
89D
Space mines
geometry
2500
x230
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
x4399
88A
Chord
brute force
,
implementation
1200
x3748
87E
Mogohu-Rea Idol
geometry
2600
x552
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x853
87C
Interesting Game
dp
,
games
,
math
2000
x1311
87B
Vasya and Types
implementation
,
strings
1800
x1117
87A
Trains
implementation
,
math
1500
x5204
86E
Long sequence
brute force
,
math
,
matrices
2700
x180
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x12668
86C
Genetic engineering
dp
,
string suffix structures
,
trees
2500
x687
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x402
86A
Reflection
math
1600
x1344
85E
Guard Towers
binary search
,
dsu
,
geometry
,
graphs
,
sortings
2600
x921
85D
Sum of Medians
binary search
,
brute force
,
data structures
,
implementation
2300
x1918
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x523
85B
Embassy Queue
data structures
,
greedy
1800
x959
85A
Domino
constructive algorithms
,
implementation
1300
x1765
84C
Biathlon
binary search
,
implementation
1700
x1591
84A
Toy Army
math
,
number theory
900
x14630
83E
Two Subsequences
bitmasks
,
dp
2800
x459
83D
Numbers
dp
,
math
,
number theory
2400
x827
83C
Track
graphs
,
greedy
,
shortest paths
2400
x403
83B
Doctor
binary search
,
math
,
sortings
1800
x1618
83A
Magical Array
math
1300
x6096
82E
Corridor
geometry
2600
x217
82D
Two out of Three
dp
2000
x1928
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
x29570
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x329
81D
Polycarp's Picture Gallery
constructive algorithms
,
greedy
2100
x634
81C
Average Score
greedy
,
math
,
sortings
1700
x1633
81B
Sequence Formatting
implementation
,
strings
1700
x1879
81A
Plug-in
implementation
1400
x10251
80B
Depression
geometry
,
math
1200
x4235
80A
Panoramix's Prediction
brute force
800
x50125
79E
Security System
math
2900
x122
79D
Password
bitmasks
,
dp
,
shortest paths
2800
x957
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1733
79B
Colorful Field
implementation
,
sortings
1400
x6856
79A
Bus Game
greedy
1200
x3984
78E
Evacuation
flows
,
graphs
,
shortest paths
2300
x530
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x303
78C
Beaver Game
dp
,
games
,
number theory
2000
x1810
78B
Easter Eggs
constructive algorithms
,
implementation
1200
x12814
78A
Haiku
implementation
,
strings
800
x12028
77E
Martian Food
geometry
2800
x364
77D
Domino Carpet
dp
,
implementation
2300
x311
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x978
77B
Falling Anvils
math
,
probabilities
1800
x2553
77A
Heroes
brute force
,
implementation
1400
x1750
76F
Tourist
binary search
,
data structures
,
dp
2300
x609
76E
Points
implementation
,
math
1700
x1663
76D
Plus and xor
dp
,
greedy
,
math
1700
x2005
76C
Mutation
bitmasks
,
dp
,
math
2700
x271
76B
Mice
greedy
,
two pointers
2100
x532
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1457
75E
Ship's Shortest Path
geometry
,
shortest paths
2400
x271
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1744
75C
Modified GCD
binary search
,
number theory
1600
x12083
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3226
75A
Life Without Zeros
implementation
1000
x25136
74E
Shift It!
constructive algorithms
2800
x143
74D
Hanger
data structures
2400
x361
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x951
74B
Train
dp
,
games
,
greedy
1500
x1497
74A
Room Leader
implementation
1000
x4952
73F
Plane of Tanks
brute force
,
geometry
2900
x76
73E
Morrowindows
math
,
number theory
2400
x324
73D
FreeDiv
dfs and similar
,
graphs
,
greedy
2200
x616
73C
LionAge II
dp
1800
x2064
73B
Need For Brake
binary search
,
greedy
,
sortings
2000
x490
73A
The Elder Trolls IV: Oblivon
greedy
,
math
1600
x1299
72I
Goofy Numbers
*special problem
,
implementation
1500
x457
72H
Reverse It!
*special problem
,
implementation
1600
x260
72G
Fibonacci army
*special problem
,
dp
1000
x2055
72F
Oil
*special problem
,
greedy
,
math
1900
x117
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x151
72D
Perse-script
*special problem
,
expression parsing
2300
x73
72C
Extraordinarily Nice Numbers
*special problem
,
math
1200
x906
72B
INI-file
*special problem
,
implementation
2200
x76
72A
Goshtasp, Vishtasp and Eidi
*special problem
,
greedy
,
math
1800
x182
71E
Nuclear Fusion
bitmasks
,
dp
2200
x678
71D
Solitaire
brute force
,
implementation
2200
x608
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6261
71B
Progress Bar
implementation
,
math
1300
x4382
71A
Way Too Long Words
strings
800
x357999
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