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Before contest
Codeforces Round 987 (Div. 2)
19:32:51
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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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Custom test
Problems
#
Name
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
x390156
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
x167565
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
64D
Presents
*special problem
,
greedy
1800
x289
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x338
64B
Expression
*special problem
,
expression parsing
1500
x1019
64A
Factorial
*special problem
,
implementation
1300
x3112
63E
Sweets Game
bitmasks
,
dfs and similar
,
dp
,
games
,
implementation
2000
x766
63D
Dividing Island
constructive algorithms
1900
x1269
63C
Bulls and Cows
brute force
,
implementation
1700
x1733
63B
Settlers' Training
implementation
1200
x4842
63A
Sinking Ship
implementation
,
sortings
,
strings
900
x11557
62E
World Evil
dp
,
flows
2700
x232
62D
Wormhouse
dfs and similar
,
graphs
2300
x374
62C
Inquisition
geometry
,
implementation
,
sortings
2300
x252
62B
Tyndex.Brome
binary search
,
implementation
1800
x1293
62A
A Student's Dream
greedy
,
math
1300
x3461
61E
Enemy is weak
data structures
,
trees
1900
x11300
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6614
61C
Capture Valerian
math
2000
x718
61B
Hard Work
strings
1300
x3881
61A
Ultra-Fast Mathematician
implementation
800
x112208
60E
Mushroom Gnomes
math
,
matrices
2600
x327
60D
Savior
brute force
,
dsu
,
math
2500
x448
60C
Mushroom Strife
brute force
,
dfs and similar
2100
x567
60B
Serial Time!
dfs and similar
,
dsu
1400
x4668
60A
Where Are My Flakes?
implementation
,
two pointers
1300
x3651
59E
Shortest Path
graphs
,
shortest paths
2000
x3470
59D
Team Arrangement
constructive algorithms
,
greedy
,
implementation
2000
x636
59C
Title
expression parsing
1600
x2110
59B
Fortune Telling
implementation
,
number theory
1200
x6912
59A
Word
implementation
,
strings
800
x178292
58E
Expression
dp
2400
x393
58D
Calendar
greedy
,
strings
2000
x734
58C
Trees
brute force
1800
x2041
58B
Coins
greedy
1300
x12265
58A
Chat room
greedy
,
strings
1000
x131111
57E
Chess
math
,
shortest paths
3000
x263
57D
Journey
dp
,
math
2500
x342
57C
Array
combinatorics
,
math
1900
x2681
57B
Martian Architecture
implementation
1600
x1022
57A
Square Earth?
dfs and similar
,
greedy
,
implementation
1300
x2912
56E
Domino Principle
binary search
,
data structures
,
sortings
2200
x2363
56D
Changing a String
dp
2100
x1647
56C
Corporation Mail
data structures
,
expression parsing
,
implementation
1700
x1172
56B
Spoilt Permutation
implementation
1300
x3735
56A
Bar
implementation
1000
x8707
55E
Very simple problem
geometry
,
two pointers
2500
x706
55D
Beautiful numbers
dp
,
number theory
2500
x3932
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