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Hello 2025
3 days
→ Filter Problems
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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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Status
Standings
Custom test
Problems
#
Name
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7524
659D
Bicycle Race
geometry
,
implementation
,
math
1500
x6360
656B
Scrambled
*special problem
,
implementation
1700
x1659
652D
Nested Segments
data structures
,
sortings
1800
x4069
652C
Foe Pairs
combinatorics
,
sortings
,
two pointers
1800
x3273
652A
Gabriel and Caterpillar
implementation
,
math
1400
x4799
650A
Watchmen
data structures
,
geometry
,
math
1400
x15711
649D
Дефрагментация памяти
constructive algorithms
,
greedy
,
implementation
1600
x372
649C
Печать условий
constructive algorithms
,
greedy
,
sortings
1500
x478
649B
Этажи
constructive algorithms
1400
x558
645D
Robot Rapping Results Report
binary search
,
dp
,
graphs
1800
x2945
645C
Enduring Exodus
binary search
,
two pointers
1600
x3373
644B
Processing Queries
*special problem
,
constructive algorithms
,
data structures
,
two pointers
1700
x2711
643B
Bear and Two Paths
constructive algorithms
,
graphs
1600
x3204
643A
Bear and Colors
implementation
1500
x4161
641C
Little Artem and Dance
brute force
,
constructive algorithms
,
implementation
1800
x3087
641B
Little Artem and Matrix
implementation
1400
x3998
639B
Bear and Forgotten Tree 3
constructive algorithms
,
graphs
,
trees
1600
x6557
638D
Three-dimensional Turtle Super Computer
brute force
,
dfs and similar
,
graphs
1800
x724
638C
Road Improvement
*special problem
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x1706
638B
Making Genome in Berland
*special problem
,
dfs and similar
,
strings
1500
x1980
637D
Running with Obstacles
*special problem
,
data structures
,
dp
,
greedy
1600
x2039
637C
Promocodes with Mistakes
*special problem
,
brute force
,
constructive algorithms
,
implementation
1400
x2435
632C
The Smallest String Concatenation
sortings
,
strings
1700
x8157
632B
Alice, Bob, Two Teams
brute force
,
constructive algorithms
1400
x4034
631C
Report
data structures
,
sortings
1700
x3804
630Q
Pyramids
geometry
,
math
1700
x1294
630M
Turn
geometry
,
math
1800
x1197
630L
Cracking the Code
implementation
,
math
1400
x3631
630K
Indivisibility
math
,
number theory
1500
x5438
630I
Parking Lot
combinatorics
,
math
1700
x6960
630H
Benches
combinatorics
,
math
1400
x5079
630G
Challenge Pennants
combinatorics
,
math
1600
x2865
627B
Factory Repairs
data structures
1700
x2942
627A
XOR Equation
dp
,
math
1700
x4266
626D
Jerry's Protest
brute force
,
combinatorics
,
dp
,
probabilities
1800
x2777
626C
Block Towers
brute force
,
greedy
,
math
,
number theory
1600
x4372
625A
Guest From the Past
implementation
,
math
1700
x5427
623A
Graph and String
constructive algorithms
,
graphs
1800
x4522
622C
Not Equal on a Segment
data structures
,
implementation
1700
x6784
621C
Wet Shark and Flowers
combinatorics
,
math
,
number theory
,
probabilities
1700
x5619
620C
Pearls in a Row
greedy
1500
x6943
618C
Constellation
geometry
,
implementation
1600
x4342
617D
Polyline
constructive algorithms
,
implementation
1700
x4236
617C
Watering Flowers
implementation
1600
x4913
616D
Longest k-Good Segment
binary search
,
data structures
,
two pointers
1600
x9881
616C
The Labyrinth
dfs and similar
1600
x5872
615B
Longtail Hedgehog
dp
,
graphs
1600
x5172
614B
Gena's Code
implementation
,
math
1400
x6971
614A
Link/Cut Tree
brute force
,
implementation
1500
x7510
612D
The Union of k-Segments
greedy
,
sortings
1800
x3943
612C
Replace To Make Regular Bracket Sequence
data structures
,
expression parsing
,
math
1400
x8288
611C
New Year and Domino
dp
,
implementation
1500
x8531
610C
Harmony Analysis
constructive algorithms
1800
x2890
609C
Load Balancing
implementation
,
math
1500
x6713
608B
Hamming Distance Sum
combinatorics
,
strings
1500
x6925
607A
Chain Reaction
binary search
,
dp
1600
x9713
606B
Testing Robots
implementation
1600
x2774
605B
Lazy Student
constructive algorithms
,
data structures
,
graphs
1700
x3504
605A
Sorting Railway Cars
constructive algorithms
,
greedy
1600
x7189
604B
More Cowbell
binary search
,
greedy
1400
x8544
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2593
603A
Alternative Thinking
dp
,
greedy
,
math
1600
x7728
602B
Approximating a Constant Range
dp
,
implementation
,
two pointers
1400
x11011
601A
The Two Routes
graphs
,
shortest paths
1600
x12234
600C
Make Palindrome
constructive algorithms
,
greedy
,
strings
1800
x6342
600A
Extract Numbers
implementation
,
strings
1600
x5364
599C
Day at the Beach
sortings
1600
x4674
599B
Spongebob and Joke
implementation
1500
x4420
598D
Igor In the Museum
dfs and similar
,
graphs
,
shortest paths
1700
x11393
597B
Restaurant
dp
,
greedy
,
sortings
1600
x4967
597A
Divisibility
math
1600
x4565
596C
Wilbur and Points
combinatorics
,
greedy
,
sortings
1700
x2262
595B
Pasha and Phone
binary search
,
math
1600
x2930
593B
Anton and Lines
geometry
,
sortings
1600
x4066
592C
The Big Race
math
1800
x3085
590A
Median Smoothing
implementation
1700
x3985
587A
Duff and Weight Lifting
greedy
1500
x7681
585B
Phillip and Trains
dfs and similar
,
graphs
,
shortest paths
1700
x3590
585A
Gennady the Dentist
brute force
,
implementation
1800
x4344
584D
Dima and Lisa
brute force
,
math
,
number theory
1800
x9558
584C
Marina and Vasya
constructive algorithms
,
greedy
,
strings
1700
x6273
584B
Kolya and Tanya
combinatorics
1500
x12136
582A
GCD Table
constructive algorithms
,
greedy
,
number theory
1700
x7845
581D
Three Logos
bitmasks
,
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3842
581C
Developing Skills
implementation
,
math
,
sortings
1400
x7351
580D
Kefa and Dishes
bitmasks
,
dp
1800
x10063
580C
Kefa and Park
dfs and similar
,
graphs
,
trees
1500
x44510
580B
Kefa and Company
binary search
,
sortings
,
two pointers
1500
x27130
578B
"Or" Game
brute force
,
greedy
1700
x5251
578A
A Problem about Polyline
geometry
,
math
1700
x4788
576A
Vasya and Petya's Game
math
,
number theory
1500
x14149
575H
Bots
combinatorics
,
dp
,
math
,
number theory
1800
x1721
575D
Tablecity
constructive algorithms
,
implementation
1700
x1880
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7853
573B
Bear and Blocks
binary search
,
data structures
,
dp
,
math
1600
x5984
570C
Replacement
constructive algorithms
,
data structures
,
implementation
1600
x9243
569A
Music
implementation
,
math
1500
x4829
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x5134
567D
One-Dimensional Battle Ships
binary search
,
data structures
,
greedy
,
sortings
1700
x4852
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