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Before contest
Codeforces Round 987 (Div. 2)
20:07:45
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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
Standings
Custom test
Problems
#
Name
83B
Doctor
binary search
,
math
,
sortings
1800
x1703
83A
Magical Array
math
1300
x6268
82E
Corridor
geometry
2600
x217
82D
Two out of Three
dp
2000
x2041
82C
General Mobilization
data structures
,
dfs and similar
,
sortings
2000
x810
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2061
82A
Double Cola
implementation
,
math
1100
x30358
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x345
81D
Polycarp's Picture Gallery
constructive algorithms
,
greedy
2100
x651
81C
Average Score
greedy
,
math
,
sortings
1700
x1671
81B
Sequence Formatting
implementation
,
strings
1700
x1956
81A
Plug-in
implementation
1400
x11030
80B
Depression
geometry
,
math
1200
x4444
80A
Panoramix's Prediction
brute force
800
x54364
79E
Security System
math
2900
x135
79D
Password
bitmasks
,
dp
,
shortest paths
2800
x1177
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1815
79B
Colorful Field
implementation
,
sortings
1400
x7287
79A
Bus Game
greedy
1200
x4093
78E
Evacuation
flows
,
graphs
,
shortest paths
2300
x574
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x329
78C
Beaver Game
dp
,
games
,
number theory
2000
x1885
78B
Easter Eggs
constructive algorithms
,
implementation
1200
x13674
78A
Haiku
implementation
,
strings
800
x12681
77E
Martian Food
geometry
2800
x379
77D
Domino Carpet
dp
,
implementation
2300
x328
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x1037
77B
Falling Anvils
math
,
probabilities
1800
x2632
77A
Heroes
brute force
,
implementation
1400
x1780
76F
Tourist
binary search
,
data structures
,
dp
2300
x638
76E
Points
implementation
,
math
1700
x1718
76D
Plus and xor
dp
,
greedy
,
math
1700
x2073
76C
Mutation
bitmasks
,
dp
,
math
2700
x313
76B
Mice
greedy
,
two pointers
2100
x751
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1605
75E
Ship's Shortest Path
geometry
,
shortest paths
2400
x279
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1829
75C
Modified GCD
binary search
,
number theory
1600
x12843
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3321
75A
Life Without Zeros
implementation
1000
x26333
74E
Shift It!
constructive algorithms
2800
x154
74D
Hanger
data structures
2400
x369
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x1288
74B
Train
dp
,
games
,
greedy
1500
x1549
74A
Room Leader
implementation
1000
x5187
73F
Plane of Tanks
brute force
,
geometry
2900
x81
73E
Morrowindows
math
,
number theory
2400
x360
73D
FreeDiv
dfs and similar
,
graphs
,
greedy
2200
x641
73C
LionAge II
dp
1800
x2124
73B
Need For Brake
binary search
,
greedy
,
sortings
2000
x506
73A
The Elder Trolls IV: Oblivon
greedy
,
math
1600
x1354
72I
Goofy Numbers
*special problem
,
implementation
1500
x465
72H
Reverse It!
*special problem
,
implementation
1600
x267
72G
Fibonacci army
*special problem
,
dp
1000
x2289
72F
Oil
*special problem
,
greedy
,
math
1900
x119
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x173
72D
Perse-script
*special problem
,
expression parsing
2300
x75
72C
Extraordinarily Nice Numbers
*special problem
,
math
1200
x923
72B
INI-file
*special problem
,
implementation
2200
x78
72A
Goshtasp, Vishtasp and Eidi
*special problem
,
greedy
,
math
1800
x186
71E
Nuclear Fusion
bitmasks
,
dp
2200
x740
71D
Solitaire
brute force
,
implementation
2200
x657
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6555
71B
Progress Bar
implementation
,
math
1300
x4550
71A
Way Too Long Words
strings
800
x390149
70E
Information Reform
dp
,
implementation
,
trees
2700
x501
70D
Professor's task
data structures
,
geometry
2700
x995
70C
Lucky Tickets
binary search
,
data structures
,
sortings
,
two pointers
2200
x579
70B
Text Messaging
expression parsing
,
greedy
,
strings
1600
x1779
70A
Cookies
math
1300
x3294
69E
Subsegments
data structures
,
implementation
1800
x4388
69D
Dot
dp
,
games
1900
x1013
69C
Game
implementation
2000
x591
69B
Bets
greedy
,
implementation
1200
x3278
69A
Young Physicist
implementation
,
math
1000
x167563
68E
Contact
geometry
2900
x72
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x470
68C
Synchrophasotron
brute force
2200
x311
68B
Energy exchange
binary search
1600
x4649
68A
Irrational problem
implementation
,
number theory
1100
x4954
67E
Save the City!
geometry
2500
x318
67D
Optical Experiment
binary search
,
data structures
,
dp
1900
x1452
67C
Sequence of Balls
dp
2600
x688
67B
Restoration of the Permutation
greedy
1800
x775
67A
Partial Teacher
dp
,
graphs
,
greedy
,
implementation
1800
x2121
66E
Petya and Post
data structures
,
dp
2000
x756
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3182
66C
Petya and File System
data structures
,
implementation
1800
x1078
66B
Petya and Countryside
brute force
,
implementation
1100
x20659
66A
Petya and Java
implementation
,
strings
1300
x6408
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x94
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x431
65C
Harry Potter and the Golden Snitch
binary search
,
geometry
2100
x789
65B
Harry Potter and the History of Magic
brute force
,
greedy
,
implementation
1700
x1375
65A
Harry Potter and Three Spells
implementation
,
math
1800
x1824
64I
Sort the Table
*special problem
,
sortings
2400
x89
64H
Table Bowling
*special problem
,
sortings
2300
x114
64G
Path Canonization
*special problem
2200
x121
64F
Domain
*special problem
,
expression parsing
2000
x181
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x242
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