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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
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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Problems
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Custom test
Problems
#
Name
120E
Put Knight!
games
,
math
1400
x2675
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x3621
120A
Elevator
brute force
,
implementation
,
math
1000
x4533
117D
Not Quick Transformation
divide and conquer
,
math
2500
x332
117A
Elevator
implementation
,
math
1300
x1987
115C
Plumber
math
2200
x591
114A
Cifera
math
1000
x13984
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x118
113D
Museum
math
,
matrices
,
probabilities
2700
x658
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1216
112B
Petya and Square
implementation
,
math
1200
x4104
109E
Lucky Interval
brute force
,
math
2700
x101
108B
Datatypes
math
,
sortings
1400
x2434
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x3386
103A
Testing Pants for Sadness
greedy
,
implementation
,
math
1100
x5922
101C
Vectors
implementation
,
math
2000
x690
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x62
100I
Rotation
*special problem
,
geometry
,
math
1500
x344
100E
Lamps in a Line
*special problem
,
math
1600
x269
98E
Help Shrek and Donkey
dp
,
games
,
math
,
probabilities
2700
x467
97C
Winning Strategy
binary search
,
graphs
,
math
,
shortest paths
2400
x302
95D
Horse Races
dp
,
math
2500
x420
94B
Friends
graphs
,
implementation
,
math
1300
x4562
93E
Lostborn
dp
,
math
,
number theory
2600
x463
93D
Flags
dp
,
math
,
matrices
2500
x339
92A
Chips
implementation
,
math
800
x18494
90A
Cableway
greedy
,
math
1000
x4574
87C
Interesting Game
dp
,
games
,
math
2000
x1316
87A
Trains
implementation
,
math
1500
x5264
86E
Long sequence
brute force
,
math
,
matrices
2700
x180
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x13127
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x403
86A
Reflection
math
1600
x1354
84A
Toy Army
math
,
number theory
900
x14756
83D
Numbers
dp
,
math
,
number theory
2400
x840
83B
Doctor
binary search
,
math
,
sortings
1800
x1629
83A
Magical Array
math
1300
x6154
82A
Double Cola
implementation
,
math
1100
x29812
81C
Average Score
greedy
,
math
,
sortings
1700
x1642
80B
Depression
geometry
,
math
1200
x4288
79E
Security System
math
2900
x127
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x307
77B
Falling Anvils
math
,
probabilities
1800
x2575
76E
Points
implementation
,
math
1700
x1689
76D
Plus and xor
dp
,
greedy
,
math
1700
x2036
76C
Mutation
bitmasks
,
dp
,
math
2700
x305
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1759
73E
Morrowindows
math
,
number theory
2400
x329
73A
The Elder Trolls IV: Oblivon
greedy
,
math
1600
x1322
72F
Oil
*special problem
,
greedy
,
math
1900
x118
72C
Extraordinarily Nice Numbers
*special problem
,
math
1200
x910
72A
Goshtasp, Vishtasp and Eidi
*special problem
,
greedy
,
math
1800
x185
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6316
71B
Progress Bar
implementation
,
math
1300
x4446
70A
Cookies
math
1300
x3245
69A
Young Physicist
implementation
,
math
1000
x159437
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x453
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3099
65A
Harry Potter and Three Spells
implementation
,
math
1800
x1796
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x238
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x335
62A
A Student's Dream
greedy
,
math
1300
x3410
61C
Capture Valerian
math
2000
x698
60E
Mushroom Gnomes
math
,
matrices
2600
x321
60D
Savior
brute force
,
dsu
,
math
2500
x402
57E
Chess
math
,
shortest paths
3000
x256
57D
Journey
dp
,
math
2500
x334
57C
Array
combinatorics
,
math
1900
x2431
55A
Flea travel
implementation
,
math
1200
x3368
54C
First Digit Law
dp
,
math
,
probabilities
2000
x1261
50E
Square Equation Roots
math
2300
x348
50A
Domino piling
greedy
,
math
800
x235860
49C
Disposition
constructive algorithms
,
math
1700
x1664
49B
Sum
math
1500
x2425
48C
The Race
math
1800
x765
47A
Triangular numbers
brute force
,
math
800
x14692
44D
Hyperdrive
math
1800
x702
42D
Strange town
constructive algorithms
,
math
2300
x392
40D
Interesting Sequence
math
2600
x129
40C
Berland Square
implementation
,
math
2300
x243
40B
Repaintings
math
1600
x1133
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x3943
39D
Cubical Planet
math
1100
x3840
38B
Chess
brute force
,
implementation
,
math
1200
x3461
37D
Lesson Timetable
combinatorics
,
dp
,
math
2300
x391
34E
Collisions
brute force
,
implementation
,
math
2000
x574
32C
Flea
math
1700
x2099
30A
Accounting
brute force
,
math
1400
x3391
28E
DravDe saves the world
geometry
,
math
2800
x87
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x767
24D
Broken robot
dp
,
math
,
probabilities
2400
x1859
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1227
23D
Tetragon
geometry
,
math
2600
x329
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3260
21B
Intersection
implementation
,
math
2000
x1321
20B
Equation
math
2000
x3757
18B
Platforms
brute force
,
math
1700
x2094
17A
Noldbach problem
brute force
,
math
,
number theory
1000
x15715
15B
Laser
math
1800
x1436
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3288
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