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Codeforces Round (Div. 2)
5 days
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Difficulty:
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math
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x9811
148B
Escape
implementation
,
math
1500
x6112
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x117559
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x2243
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x15817
142A
Help Farmer
brute force
,
math
1600
x2886
141B
Hopscotch
geometry
,
math
1400
x5886
140A
New Year Table
geometry
,
math
1700
x4418
139B
Wallpaper
implementation
,
math
1600
x1476
136B
Ternary Logic
implementation
,
math
1100
x5538
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2725
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x2576
131C
The World is a Theatre
combinatorics
,
math
1400
x12968
131B
Opposites Attract
implementation
,
math
1200
x7729
128E
Birthday
geometry
,
math
2900
x147
126D
Fibonacci Sums
dp
,
math
2300
x995
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1622
125A
Measuring Lengths in Baden
math
1400
x3337
124A
The number of positions
math
1000
x45533
123B
Squares
math
1800
x1335
120E
Put Knight!
games
,
math
1400
x3042
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x4033
120A
Elevator
brute force
,
implementation
,
math
1000
x5787
117D
Not Quick Transformation
divide and conquer
,
math
2500
x412
117A
Elevator
implementation
,
math
1300
x2252
115C
Plumber
math
2200
x714
114A
Cifera
math
1000
x15398
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x190
113D
Museum
math
,
matrices
,
probabilities
2700
x1000
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1518
112B
Petya and Square
implementation
,
math
1200
x4642
109E
Lucky Interval
brute force
,
math
2700
x144
108B
Datatypes
math
,
sortings
1400
x2782
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x4525
103A
Testing Pants for Sadness
greedy
,
implementation
,
math
1100
x6731
101C
Vectors
implementation
,
math
2000
x855
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x77
100I
Rotation
*special problem
,
geometry
,
math
1500
x438
100E
Lamps in a Line
*special problem
,
math
1600
x307
98E
Help Shrek and Donkey
dp
,
games
,
math
,
probabilities
2700
x577
97C
Winning Strategy
binary search
,
graphs
,
math
,
shortest paths
2400
x374
95D
Horse Races
dp
,
math
2500
x562
94B
Friends
graphs
,
implementation
,
math
1300
x5498
93E
Lostborn
dp
,
math
,
number theory
2600
x558
93D
Flags
dp
,
math
,
matrices
2500
x496
92A
Chips
implementation
,
math
800
x22002
90A
Cableway
greedy
,
math
1000
x5706
87C
Interesting Game
dp
,
games
,
math
2000
x1814
87A
Trains
implementation
,
math
1500
x5933
86E
Long sequence
brute force
,
math
,
matrices
2700
x243
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x18252
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x477
86A
Reflection
math
1600
x1692
84A
Toy Army
math
,
number theory
900
x16995
83D
Numbers
dp
,
math
,
number theory
2400
x1095
83B
Doctor
binary search
,
math
,
sortings
1800
x1919
83A
Magical Array
math
1300
x7053
82A
Double Cola
implementation
,
math
1100
x32791
81C
Average Score
greedy
,
math
,
sortings
1700
x1879
80B
Depression
geometry
,
math
1200
x5189
79E
Security System
math
2900
x198
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x428
77B
Falling Anvils
math
,
probabilities
1800
x2944
76E
Points
implementation
,
math
1700
x1954
76D
Plus and xor
dp
,
greedy
,
math
1700
x2589
76C
Mutation
bitmasks
,
dp
,
math
2700
x393
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x2143
73E
Morrowindows
math
,
number theory
2400
x441
73A
The Elder Trolls IV: Oblivon
greedy
,
math
1600
x1675
72F
Oil
*special problem
,
greedy
,
math
1900
x151
72C
Extraordinarily Nice Numbers
*special problem
,
math
1200
x1074
72A
Goshtasp, Vishtasp and Eidi
*special problem
,
greedy
,
math
1800
x203
71C
Round Table Knights
dp
,
math
,
number theory
1600
x7523
71B
Progress Bar
implementation
,
math
1300
x5509
70A
Cookies
math
1300
x3629
69A
Young Physicist
implementation
,
math
1000
x212279
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x541
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3810
65A
Harry Potter and Three Spells
implementation
,
math
1800
x2067
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x302
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x362
62A
A Student's Dream
greedy
,
math
1300
x3898
61C
Capture Valerian
math
2000
x1014
60E
Mushroom Gnomes
math
,
matrices
2600
x532
60D
Savior
brute force
,
dsu
,
math
2500
x598
57E
Chess
math
,
shortest paths
3000
x395
57D
Journey
dp
,
math
2500
x369
57C
Array
combinatorics
,
math
1900
x4504
55A
Flea travel
implementation
,
math
1200
x4001
54C
First Digit Law
dp
,
math
,
probabilities
2000
x1778
50E
Square Equation Roots
math
2300
x474
50A
Domino piling
greedy
,
math
800
x342364
49C
Disposition
constructive algorithms
,
math
1700
x1923
49B
Sum
math
1500
x2878
48C
The Race
math
1800
x875
47A
Triangular numbers
brute force
,
math
800
x18842
44D
Hyperdrive
math
1800
x817
42D
Strange town
constructive algorithms
,
math
2300
x527
40D
Interesting Sequence
math
2600
x203
40C
Berland Square
implementation
,
math
2300
x371
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