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Before contest
Codeforces Round 941 (Div. 1)
03:55:15
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
03:55:15
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→ Filter Problems
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math
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
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x6741
148B
Escape
implementation
,
math
1500
x5255
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x86834
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1881
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x13018
142A
Help Farmer
brute force
,
math
1600
x2563
141B
Hopscotch
geometry
,
math
1400
x5120
140A
New Year Table
geometry
,
math
1700
x4081
139B
Wallpaper
implementation
,
math
1600
x1273
136B
Ternary Logic
implementation
,
math
1100
x4640
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2295
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x1906
131C
The World is a Theatre
combinatorics
,
math
1400
x10619
131B
Opposites Attract
implementation
,
math
1200
x6857
128E
Birthday
geometry
,
math
2900
x96
126D
Fibonacci Sums
dp
,
math
2300
x805
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1402
125A
Measuring Lengths in Baden
math
1400
x2634
124A
The number of positions
math
1000
x36208
123B
Squares
math
1800
x1089
120E
Put Knight!
games
,
math
1400
x2639
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x3575
120A
Elevator
brute force
,
implementation
,
math
1000
x4488
117D
Not Quick Transformation
divide and conquer
,
math
2500
x330
117A
Elevator
implementation
,
math
1300
x1971
115C
Plumber
math
2200
x587
114A
Cifera
math
1000
x13835
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x116
113D
Museum
math
,
matrices
,
probabilities
2700
x648
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1201
112B
Petya and Square
implementation
,
math
1200
x4062
109E
Lucky Interval
brute force
,
math
2700
x98
108B
Datatypes
math
,
sortings
1400
x2407
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x3279
103A
Testing Pants for Sadness
greedy
,
implementation
,
math
1100
x5855
101C
Vectors
implementation
,
math
2000
x684
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x60
100I
Rotation
*special problem
,
geometry
,
math
1500
x338
100E
Lamps in a Line
*special problem
,
math
1600
x265
98E
Help Shrek and Donkey
dp
,
games
,
math
,
probabilities
2700
x442
97C
Winning Strategy
binary search
,
graphs
,
math
,
shortest paths
2400
x296
95D
Horse Races
dp
,
math
2500
x413
94B
Friends
graphs
,
implementation
,
math
1300
x4482
93E
Lostborn
dp
,
math
,
number theory
2600
x433
93D
Flags
dp
,
math
,
matrices
2500
x333
92A
Chips
implementation
,
math
800
x18176
90A
Cableway
greedy
,
math
1000
x4498
87C
Interesting Game
dp
,
games
,
math
2000
x1302
87A
Trains
implementation
,
math
1500
x5157
86E
Long sequence
brute force
,
math
,
matrices
2700
x178
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x12487
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x401
86A
Reflection
math
1600
x1339
84A
Toy Army
math
,
number theory
900
x14537
83D
Numbers
dp
,
math
,
number theory
2400
x817
83B
Doctor
binary search
,
math
,
sortings
1800
x1615
83A
Magical Array
math
1300
x6060
82A
Double Cola
implementation
,
math
1100
x29389
81C
Average Score
greedy
,
math
,
sortings
1700
x1624
80B
Depression
geometry
,
math
1200
x4216
79E
Security System
math
2900
x118
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x301
77B
Falling Anvils
math
,
probabilities
1800
x2537
76E
Points
implementation
,
math
1700
x1653
76D
Plus and xor
dp
,
greedy
,
math
1700
x1989
76C
Mutation
bitmasks
,
dp
,
math
2700
x267
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1715
73E
Morrowindows
math
,
number theory
2400
x322
73A
The Elder Trolls IV: Oblivon
greedy
,
math
1600
x1296
72F
Oil
*special problem
,
greedy
,
math
1900
x116
72C
Extraordinarily Nice Numbers
*special problem
,
math
1200
x856
72A
Goshtasp, Vishtasp and Eidi
*special problem
,
greedy
,
math
1800
x181
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6215
71B
Progress Bar
implementation
,
math
1300
x4355
70A
Cookies
math
1300
x3211
69A
Young Physicist
implementation
,
math
1000
x154520
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x446
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3042
65A
Harry Potter and Three Spells
implementation
,
math
1800
x1781
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x234
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x331
62A
A Student's Dream
greedy
,
math
1300
x3361
61C
Capture Valerian
math
2000
x691
60E
Mushroom Gnomes
math
,
matrices
2600
x316
60D
Savior
brute force
,
dsu
,
math
2500
x394
57E
Chess
math
,
shortest paths
3000
x249
57D
Journey
dp
,
math
2500
x329
57C
Array
combinatorics
,
math
1900
x2312
55A
Flea travel
implementation
,
math
1200
x3332
54C
First Digit Law
dp
,
math
,
probabilities
2000
x1242
50E
Square Equation Roots
math
2300
x342
50A
Domino piling
greedy
,
math
800
x227889
49C
Disposition
constructive algorithms
,
math
1700
x1638
49B
Sum
math
1500
x2382
48C
The Race
math
1800
x755
47A
Triangular numbers
brute force
,
math
800
x14238
44D
Hyperdrive
math
1800
x688
42D
Strange town
constructive algorithms
,
math
2300
x385
40D
Interesting Sequence
math
2600
x124
40C
Berland Square
implementation
,
math
2300
x239
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