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Codeforces Round 987 (Div. 2)
07:53:16
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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
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2600
117B
Very Interesting Game
brute force
,
number theory
1800
x1612
117A
Elevator
implementation
,
math
1300
x2024
115B
Lawnmower
greedy
,
sortings
1500
x2615
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3714
113A
Grammar Lessons
implementation
,
strings
1600
x2304
111B
Petya and Divisors
binary search
,
data structures
,
number theory
1900
x3694
111A
Petya and Inequiations
greedy
1400
x4793
109C
Lucky Tree
dp
,
dsu
,
trees
1900
x3596
109B
Lucky Probability
brute force
,
probabilities
1900
x1556
108B
Datatypes
math
,
sortings
1400
x2469
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x3503
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x5118
106D
Treasure Island
brute force
,
implementation
1700
x1356
106C
Buns
dp
1700
x6018
105B
Dark Assembly
brute force
,
probabilities
1800
x819
105A
Transmigration
implementation
1700
x1844
103C
Russian Roulette
constructive algorithms
,
greedy
1900
x960
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x8974
101B
Buses
binary search
,
data structures
,
dp
1700
x2590
100I
Rotation
*special problem
,
geometry
,
math
1500
x351
100G
Name the album
*special problem
,
data structures
,
implementation
1800
x124
100F
Polynom
*special problem
,
implementation
1800
x135
100E
Lamps in a Line
*special problem
,
math
1600
x273
100D
World of Mouth
*special problem
,
strings
1500
x305
100C
A+B
*special problem
,
implementation
1400
x536
100B
Friendly Numbers
*special problem
,
implementation
1500
x545
99B
Help Chef Gerasim
implementation
,
sortings
1300
x2980
98A
Help Victoria the Wise
brute force
,
implementation
1700
x1216
96B
Lucky Numbers (easy)
binary search
,
bitmasks
,
brute force
1300
x15654
95C
Volleyball
shortest paths
1900
x2807
95B
Lucky Numbers
dp
,
greedy
1800
x1225
95A
Hockey
implementation
,
strings
1600
x1678
94B
Friends
graphs
,
implementation
,
math
1300
x4697
93B
End of Exams
greedy
1900
x921
93A
Frames
implementation
1700
x1963
92B
Binary Number
greedy
1300
x4875
91B
Queue
binary search
,
data structures
1500
x6857
91A
Newspaper Headline
greedy
,
strings
1500
x3606
89A
Robbery
greedy
1800
x1483
88B
Keyboard
implementation
1500
x4712
87B
Vasya and Types
implementation
,
strings
1800
x1155
87A
Trains
implementation
,
math
1500
x5407
86A
Reflection
math
1600
x1389
85B
Embassy Queue
data structures
,
greedy
1800
x980
85A
Domino
constructive algorithms
,
implementation
1300
x1795
84C
Biathlon
binary search
,
implementation
1700
x1708
83B
Doctor
binary search
,
math
,
sortings
1800
x1703
83A
Magical Array
math
1300
x6268
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2061
81C
Average Score
greedy
,
math
,
sortings
1700
x1671
81B
Sequence Formatting
implementation
,
strings
1700
x1956
81A
Plug-in
implementation
1400
x11030
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1815
79B
Colorful Field
implementation
,
sortings
1400
x7287
77B
Falling Anvils
math
,
probabilities
1800
x2632
77A
Heroes
brute force
,
implementation
1400
x1780
76E
Points
implementation
,
math
1700
x1718
76D
Plus and xor
dp
,
greedy
,
math
1700
x2073
75C
Modified GCD
binary search
,
number theory
1600
x12844
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3321
74B
Train
dp
,
games
,
greedy
1500
x1550
73C
LionAge II
dp
1800
x2124
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
72F
Oil
*special problem
,
greedy
,
math
1900
x119
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x173
72A
Goshtasp, Vishtasp and Eidi
*special problem
,
greedy
,
math
1800
x186
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6557
71B
Progress Bar
implementation
,
math
1300
x4550
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
68B
Energy exchange
binary search
1600
x4650
67D
Optical Experiment
binary search
,
data structures
,
dp
1900
x1452
67B
Restoration of the Permutation
greedy
1800
x775
67A
Partial Teacher
dp
,
graphs
,
greedy
,
implementation
1800
x2121
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3182
66C
Petya and File System
data structures
,
implementation
1800
x1078
66A
Petya and Java
implementation
,
strings
1300
x6408
65B
Harry Potter and the History of Magic
brute force
,
greedy
,
implementation
1700
x1375
65A
Harry Potter and Three Spells
implementation
,
math
1800
x1824
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x243
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
63D
Dividing Island
constructive algorithms
1900
x1269
63C
Bulls and Cows
brute force
,
implementation
1700
x1733
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
x11302
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6614
61B
Hard Work
strings
1300
x3881
60B
Serial Time!
dfs and similar
,
dsu
1400
x4669
60A
Where Are My Flakes?
implementation
,
two pointers
1300
x3651
59C
Title
expression parsing
1600
x2110
58C
Trees
brute force
1800
x2041
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