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Custom test
Problems
#
Name
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x402
86A
Reflection
math
1600
x1347
84A
Toy Army
math
,
number theory
900
x14666
83D
Numbers
dp
,
math
,
number theory
2400
x829
83B
Doctor
binary search
,
math
,
sortings
1800
x1627
83A
Magical Array
math
1300
x6116
82A
Double Cola
implementation
,
math
1100
x29644
81C
Average Score
greedy
,
math
,
sortings
1700
x1635
80B
Depression
geometry
,
math
1200
x4241
79E
Security System
math
2900
x122
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x303
77B
Falling Anvils
math
,
probabilities
1800
x2557
76E
Points
implementation
,
math
1700
x1667
76D
Plus and xor
dp
,
greedy
,
math
1700
x2012
76C
Mutation
bitmasks
,
dp
,
math
2700
x272
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1751
73E
Morrowindows
math
,
number theory
2400
x324
73A
The Elder Trolls IV: Oblivon
greedy
,
math
1600
x1307
72F
Oil
*special problem
,
greedy
,
math
1900
x117
72C
Extraordinarily Nice Numbers
*special problem
,
math
1200
x907
72A
Goshtasp, Vishtasp and Eidi
*special problem
,
greedy
,
math
1800
x183
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6275
71B
Progress Bar
implementation
,
math
1300
x4399
70A
Cookies
math
1300
x3230
69A
Young Physicist
implementation
,
math
1000
x157406
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x452
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3075
65A
Harry Potter and Three Spells
implementation
,
math
1800
x1787
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x236
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x333
62A
A Student's Dream
greedy
,
math
1300
x3389
61C
Capture Valerian
math
2000
x696
60E
Mushroom Gnomes
math
,
matrices
2600
x318
60D
Savior
brute force
,
dsu
,
math
2500
x398
57E
Chess
math
,
shortest paths
3000
x252
57D
Journey
dp
,
math
2500
x333
57C
Array
combinatorics
,
math
1900
x2384
55A
Flea travel
implementation
,
math
1200
x3347
54C
First Digit Law
dp
,
math
,
probabilities
2000
x1254
50E
Square Equation Roots
math
2300
x347
50A
Domino piling
greedy
,
math
800
x232676
49C
Disposition
constructive algorithms
,
math
1700
x1656
49B
Sum
math
1500
x2409
48C
The Race
math
1800
x761
47A
Triangular numbers
brute force
,
math
800
x14441
44D
Hyperdrive
math
1800
x695
42D
Strange town
constructive algorithms
,
math
2300
x390
40D
Interesting Sequence
math
2600
x128
40C
Berland Square
implementation
,
math
2300
x243
40B
Repaintings
math
1600
x1126
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x3916
39D
Cubical Planet
math
1100
x3791
38B
Chess
brute force
,
implementation
,
math
1200
x3431
37D
Lesson Timetable
combinatorics
,
dp
,
math
2300
x390
34E
Collisions
brute force
,
implementation
,
math
2000
x567
32C
Flea
math
1700
x2079
30A
Accounting
brute force
,
math
1400
x3347
28E
DravDe saves the world
geometry
,
math
2800
x87
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x763
24D
Broken robot
dp
,
math
,
probabilities
2400
x1815
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1220
23D
Tetragon
geometry
,
math
2600
x327
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3223
21B
Intersection
implementation
,
math
2000
x1312
20B
Equation
math
2000
x3704
18B
Platforms
brute force
,
math
1700
x2079
17A
Noldbach problem
brute force
,
math
,
number theory
1000
x15359
15B
Laser
math
1800
x1307
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3228
13A
Numbers
implementation
,
math
1000
x7534
11B
Jumping Jack
math
1600
x4501
11A
Increasing Sequence
constructive algorithms
,
implementation
,
math
900
x12706
9C
Hexadecimal's Numbers
brute force
,
implementation
,
math
1200
x12604
9A
Die Roll
math
,
probabilities
800
x53534
7C
Line
math
,
number theory
1800
x4414
5D
Follow Traffic Rules
implementation
,
math
2100
x1655
4A
Watermelon
brute force
,
math
800
x490306
2B
The least round way
dp
,
math
2000
x10479
1C
Ancient Berland Circus
geometry
,
math
2100
x5557
1B
Spreadsheet
implementation
,
math
1600
x21907
1A
Theatre Square
math
1000
x249318
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→ Pay attention
Before contest
Codeforces Round 954 (Div. 3)
5 days
→ Filter Problems
Difficulty:
—
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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