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data structures
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
#
Name
2038I
Polyathlon
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2500
x379
2038F
Alternative Platforms
combinatorics
,
data structures
,
fft
,
math
,
sortings
2500
x291
2038E
Barrels
data structures
,
greedy
,
math
2900
x83
2038D
Divide OR Conquer
bitmasks
,
data structures
,
dp
,
implementation
2400
x420
2038C
DIY
data structures
,
geometry
,
greedy
,
sortings
1400
x2690
2037G
Natlan Exploring
bitmasks
,
combinatorics
,
data structures
,
dp
,
math
,
number theory
2000
x1873
2037F
Ardent Flames
binary search
,
data structures
,
math
,
sortings
,
two pointers
2100
x1468
2037D
Sharky Surfing
data structures
,
greedy
,
two pointers
1300
x8133
2036E
Reverse the Rivers
binary search
,
constructive algorithms
,
data structures
,
greedy
1600
x6373
2035D
Yet Another Real Number Problem
binary search
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
math
1800
x4397
2033G
Sakurako and Chefir
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
2200
x1258
2033E
Sakurako, Kosuke, and the Permutation
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
1400
x9832
2033D
Kousuke's Assignment
data structures
,
dp
,
dsu
,
greedy
,
math
1300
x12932
2032E
Balanced
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
2400
x941
2032D
Genokraken
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
interactive
,
trees
,
two pointers
1800
x4501
2031E
Penchick and Chloe's Trees
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
sortings
,
trees
2100
x1567
2031D
Penchick and Desert Rabbit
binary search
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
two pointers
1700
x5192
2030F
Orangutan Approved Subarrays
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
2400
x675
2030E
MEXimize the Score
combinatorics
,
data structures
,
dp
,
greedy
,
implementation
,
math
2200
x1319
2030D
QED's Favorite Permutation
data structures
,
implementation
,
sortings
1700
x6211
2029G
Balanced Problem
data structures
,
dp
3000
x124
2029D
Cool Graph
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
1900
x2603
2029C
New Rating
binary search
,
data structures
,
dp
,
greedy
1700
x4755
2028D
Alice's Adventures in Cards
constructive algorithms
,
data structures
,
dp
,
graphs
,
greedy
,
implementation
,
ternary search
2000
x2292
2027D2
The Endspeaker (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
2200
x1294
2027C
Add Zeros
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
1500
x8812
2026F
Bermart Ice Cream
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
implementation
,
trees
2700
x170
2026D
Sums of Segments
binary search
,
data structures
,
dp
,
implementation
,
math
1900
x3945
2026C
Action Figures
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
1500
x8556
2025G
Variable Damage
data structures
,
flows
3000
x136
2025D
Attribute Checks
brute force
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1800
x5875
2023F
Hills and Pits
data structures
,
greedy
,
math
,
matrices
3500
x58
2022E2
Billetes MX (Hard Version)
binary search
,
combinatorics
,
data structures
,
dsu
,
graphs
2600
x373
2021E3
Digital Village (Extreme Version)
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
math
,
trees
2800
x427
2021E2
Digital Village (Hard Version)
data structures
,
dp
,
dsu
,
graphs
,
math
,
trees
2500
x819
2021E1
Digital Village (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
,
greedy
,
implementation
,
math
,
trees
2300
x1480
2021C2
Adjust The Presentation (Hard Version)
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
1900
x3554
2021A
Meaning Mean
data structures
,
greedy
,
math
,
sortings
800
x18538
2018E2
Complex Segments (Hard Version)
binary search
,
data structures
,
divide and conquer
,
dsu
,
greedy
,
math
,
sortings
3400
x111
2018E1
Complex Segments (Easy Version)
binary search
,
data structures
,
divide and conquer
,
dsu
,
greedy
,
math
,
sortings
3300
x148
2018D
Max Plus Min Plus Size
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
matrices
,
sortings
2200
x1591
2018B
Speedbreaker
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
1900
x3936
2014H
Robin Hood Archery
data structures
,
divide and conquer
,
greedy
,
hashing
1900
x3493
2014G
Milky Days
brute force
,
data structures
,
greedy
,
implementation
2200
x1278
2014D
Robert Hood and Mrs Hood
brute force
,
data structures
,
greedy
,
sortings
1400
x12066
2013F2
Game in Tree (Hard Version)
binary search
,
data structures
,
trees
3500
x103
2013F1
Game in Tree (Easy Version)
binary search
,
brute force
,
data structures
,
dp
,
games
,
greedy
,
implementation
,
trees
2700
x473
2011I
Stack and Queue
*special problem
,
data structures
,
divide and conquer
x14
2011F
Good Subarray
*special problem
,
data structures
,
greedy
x115
2009G3
Yunli's Subarray Queries (extreme version)
data structures
,
dp
,
implementation
2700
x331
2009G2
Yunli's Subarray Queries (hard version)
binary search
,
data structures
,
dp
2200
x1204
2009G1
Yunli's Subarray Queries (easy version)
binary search
,
data structures
,
two pointers
1900
x3777
2009F
Firefly's Queries
bitmasks
,
data structures
,
flows
,
math
1700
x6520
2008E
Alternating String
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
strings
1500
x9980
2007B
Index and Maximum Value
data structures
,
greedy
900
x21164
2006E
Iris's Full Binary Tree
brute force
,
data structures
,
dfs and similar
,
trees
3100
x226
2006D
Iris and Adjacent Products
data structures
,
greedy
,
implementation
,
math
2600
x674
2006C
Eri and Expanded Sets
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
2300
x1641
2006B
Iris and the Tree
brute force
,
data structures
,
dfs and similar
,
dsu
,
math
,
trees
1800
x3330
2005E2
Subtangle Game (Hard Version)
data structures
,
dp
,
games
,
greedy
,
implementation
2500
x797
2005D
Alter the GCD
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
number theory
2400
x875
2004G
Substring Compression
data structures
,
dp
,
matrices
3200
x303
2004F
Make a Palindrome
binary search
,
brute force
,
data structures
,
greedy
,
math
2600
x1175
2004D
Colored Portals
binary search
,
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
1600
x10733
2003F
Turtle and Three Sequences
brute force
,
data structures
,
dp
,
greedy
,
math
,
probabilities
,
two pointers
2800
x481
2003E2
Turtle and Inversions (Hard Version)
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
two pointers
2700
x520
2002E
Cosmic Rays
brute force
,
data structures
,
dp
2300
x2440
2002D2
DFS Checker (Hard Version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
2300
x2394
2002D1
DFS Checker (Easy Version)
brute force
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
1900
x4333
2001D
Longest Max Min Subsequence
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
1900
x5033
2000H
Ksyusha and the Loaded Set
binary search
,
brute force
,
data structures
,
implementation
2200
x1656
2000E
Photoshoot for Gorillas
combinatorics
,
data structures
,
greedy
,
math
1400
x13268
2000C
Numeric String Template
data structures
,
strings
1000
x25402
1998E2
Eliminating Balls With Merging (Hard Version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
2500
x694
1998E1
Eliminating Balls With Merging (Easy Version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
greedy
2200
x1840
1998D
Determine Winning Islands in Race
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
2100
x3324
1997E
Level Up
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
2200
x3135
1997C
Even Positions
constructive algorithms
,
data structures
,
greedy
1100
x22031
1996G
Penacony
brute force
,
data structures
,
graphs
,
greedy
,
hashing
2200
x1771
1996E
Decode
combinatorics
,
data structures
,
implementation
,
math
1600
x9827
1995E2
Let Me Teach You a Lesson (Hard Version)
data structures
,
dp
,
matrices
,
two pointers
2900
x303
1995E1
Let Me Teach You a Lesson (Easy Version)
2-sat
,
data structures
,
dp
,
matrices
,
two pointers
2700
x381
1995B2
Bouquet (Hard Version)
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1700
x8796
1990F
Polygonal Segments
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
,
two pointers
2800
x296
1990E2
Catch the Mole(Hard Version)
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
interactive
,
trees
2600
x870
1990E1
Catch the Mole(Easy Version)
binary search
,
data structures
,
dfs and similar
,
interactive
,
trees
2500
x929
1989D
Smithing Skill
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
,
two pointers
1900
x5990
1988E
Range Minimum Sum
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
2300
x1426
1987E
Wonderful Tree!
brute force
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2000
x3415
1986G2
Permutation Problem (Hard Version)
brute force
,
data structures
,
hashing
,
math
,
number theory
2500
x1094
1986G1
Permutation Problem (Simple Version)
binary search
,
brute force
,
combinatorics
,
data structures
,
math
,
number theory
2200
x1502
1986C
Update Queries
data structures
,
greedy
,
sortings
1100
x22893
1986B
Matrix Stabilization
brute force
,
data structures
,
greedy
,
sortings
1000
x26668
1985H2
Maximize the Largest Component (Hard Version)
data structures
,
dfs and similar
,
dp
,
dsu
,
implementation
2200
x1539
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
1700
x5628
1985F
Final Boss
binary search
,
data structures
1500
x15403
1983F
array-value
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
2500
x1209
1983D
Swap Dilemma
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
math
,
sortings
1700
x8246
1982F
Sorting Problem Again
binary search
,
data structures
,
sortings
2600
x964
1982D
Beauty of the mountains
brute force
,
data structures
,
implementation
,
math
,
number theory
1700
x7184
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