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Problems
#
Name
690E2
Photographs (II)
2600
x141
690E1
Photographs (I)
1800
x666
690D3
The Wall (hard)
dp
2100
x490
690D2
The Wall (medium)
combinatorics
1800
x1210
690D1
The Wall (easy)
1200
x2560
690C3
Brain Network (hard)
trees
2200
x884
690C2
Brain Network (medium)
dfs and similar
,
graphs
,
trees
1500
x3584
690C1
Brain Network (easy)
1300
x2689
690B3
Recover Polygon (hard)
data structures
2600
x90
690B2
Recover Polygon (medium)
geometry
2600
x195
690B1
Recover Polygon (easy)
1700
x925
690A3
Collective Mindsets (hard)
2400
x517
690A2
Collective Mindsets (medium)
2300
x687
690A1
Collective Mindsets (easy)
1100
x2773
689E
Mike and Geometry Problem
combinatorics
,
data structures
,
dp
,
geometry
,
implementation
2000
x1809
689D
Friends and Subsequences
binary search
,
data structures
2100
x3068
689C
Mike and Chocolate Thieves
binary search
,
combinatorics
,
math
1700
x4904
689B
Mike and Shortcuts
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x5610
689A
Mike and Cellphone
brute force
,
constructive algorithms
,
implementation
1400
x5196
688B
Lovely Palindromes
constructive algorithms
,
math
1000
x30312
688A
Opponents
implementation
800
x13729
687E
TOF
dfs and similar
,
graphs
2900
x310
687D
Dividing Kingdom II
brute force
,
data structures
,
dsu
,
graphs
,
sortings
2500
x854
687C
The Values You Can Make
dp
1900
x4974
687B
Remainders Game
chinese remainder theorem
,
math
,
number theory
1800
x5559
687A
NP-Hard Problem
dfs and similar
,
graphs
1500
x13789
686B
Little Robber Girl's Zoo
constructive algorithms
,
implementation
,
sortings
1100
x7717
686A
Free Ice Cream
constructive algorithms
,
implementation
800
x35666
685E
Travelling Through the Snow Queen's Kingdom
bitmasks
,
brute force
,
divide and conquer
,
graphs
2800
x503
685D
Kay and Eternity
brute force
,
implementation
,
sortings
2600
x477
685C
Optimal Point
binary search
,
math
2900
x576
685B
Kay and Snowflake
data structures
,
dfs and similar
,
dp
,
trees
1900
x3788
685A
Robbers' watch
brute force
,
combinatorics
,
dp
,
math
1700
x4145
683J
The Hero with Bombs
*special problem
3000
x40
683I
Loader
*special problem
,
graphs
2500
x38
683H
Exchange of Books
*special problem
1900
x95
683G
The Fraction
*special problem
1900
x130
683F
Reformat the String
*special problem
1800
x146
683E
Hammer throwing
*special problem
1800
x187
683D
Chocolate Bar
*special problem
,
math
1400
x319
683C
Symmetric Difference
*special problem
1600
x314
683B
The Teacher of Physical Education
*special problem
1600
x316
683A
The Check of the Point
*special problem
,
geometry
1200
x787
682E
Alyona and Triangles
geometry
,
two pointers
2600
x647
682D
Alyona and Strings
dp
,
strings
1900
x3174
682C
Alyona and the Tree
dfs and similar
,
dp
,
graphs
,
trees
1600
x7009
682B
Alyona and Mex
sortings
1200
x11106
682A
Alyona and Numbers
constructive algorithms
,
math
,
number theory
1100
x20544
681E
Runaway to a Shadow
geometry
,
sortings
2500
x454
681D
Gifts by the List
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2000
x1720
681C
Heap Operations
constructive algorithms
,
data structures
,
greedy
1600
x7298
681B
Economy Game
brute force
1300
x8774
681A
A Good Contest
implementation
800
x15077
680B
Bear and Finding Criminals
constructive algorithms
,
implementation
1000
x23468
680A
Bear and Five Cards
constructive algorithms
,
implementation
800
x12186
679E
Bear and Bad Powers of 42
data structures
3100
x662
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x311
679C
Bear and Square Grid
dfs and similar
,
dsu
,
implementation
2400
x1132
679B
Bear and Tower of Cubes
binary search
,
dp
,
greedy
2200
x2113
679A
Bear and Prime 100
constructive algorithms
,
interactive
,
math
1400
x12392
678F
Lena and Queries
data structures
,
divide and conquer
,
geometry
2500
x825
678E
Another Sith Tournament
bitmasks
,
dp
,
math
,
probabilities
2200
x1906
678D
Iterated Linear Function
math
,
number theory
1700
x4287
678C
Joty and Chocolate
implementation
,
math
,
number theory
1600
x9064
678B
The Same Calendar
implementation
1600
x4023
678A
Johny Likes Numbers
implementation
,
math
800
x12583
677E
Vanya and Balloons
binary search
,
brute force
,
dp
,
implementation
2300
x583
677D
Vanya and Treasure
data structures
,
dp
,
graphs
,
shortest paths
2300
x1530
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6284
677B
Vanya and Food Processor
implementation
,
math
1400
x7538
677A
Vanya and Fence
implementation
800
x131291
676E
The Last Fight Between Human and AI
math
2400
x884
676D
Theseus and labyrinth
graphs
,
implementation
,
shortest paths
2000
x1828
676C
Vasya and String
binary search
,
dp
,
strings
,
two pointers
1500
x18172
676B
Pyramid of Glasses
implementation
,
math
,
math
1500
x5460
676A
Nicholas and Permutation
constructive algorithms
,
implementation
800
x13647
675E
Trains and Statistic
data structures
,
dp
,
greedy
2300
x2615
675D
Tree Construction
data structures
,
trees
1800
x3659
675C
Money Transfers
constructive algorithms
,
data structures
,
greedy
,
sortings
2100
x3423
675B
Restoring Painting
brute force
,
constructive algorithms
,
math
1400
x7299
675A
Infinite Sequence
math
1100
x14761
673B
Problems for Round
greedy
,
implementation
1300
x3497
673A
Bear and Game
implementation
800
x9910
672B
Different is Good
constructive algorithms
,
implementation
,
strings
1000
x17075
672A
Summer Camp
implementation
800
x15014
671E
Organizing a Race
data structures
,
greedy
3300
x394
671D
Roads in Yusland
data structures
,
dp
,
greedy
2900
x1110
671C
Ultimate Weirdness of an Array
data structures
,
number theory
2800
x663
671B
Robin Hood
binary search
,
greedy
2000
x2967
671A
Recycling Bottles
dp
,
geometry
,
greedy
,
implementation
1800
x4108
670F
Restore a Number
brute force
,
constructive algorithms
,
strings
2300
x847
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x3155
670D2
Magic Powder - 2
binary search
,
implementation
1500
x13126
670D1
Magic Powder - 1
binary search
,
brute force
,
implementation
1400
x16096
670C
Cinema
implementation
,
sortings
1300
x8930
670B
Game of Robots
implementation
1000
x10988
670A
Holidays
brute force
,
constructive algorithms
,
greedy
,
math
900
x16444
669A
Little Artem and Presents
math
800
x10560
667B
Coat of Anticubism
constructive algorithms
,
geometry
1100
x5457
667A
Pouring Rain
geometry
,
math
1100
x7789
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