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Problems
#
Name
1846A
Rudolph and Cut the Rope
implementation
,
math
800
x31632
1845E
Boxes and Balls
dp
,
implementation
,
math
2500
x1280
1845B
Come Together
geometry
,
implementation
,
math
900
x21006
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x24965
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x655
1844C
Particles
dp
,
greedy
,
implementation
,
math
1300
x15001
1841B
Keep it Beautiful
implementation
1000
x20749
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7621
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32891
1839A
The Good Array
greedy
,
implementation
,
math
800
x17138
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2090
1836A
Destroyer
implementation
,
sortings
800
x19903
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x152
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7502
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2087
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4386
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4996
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6839
1833A
Musical Puzzle
implementation
,
strings
800
x31765
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1811
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2816
1832C
Contrast Value
greedy
,
implementation
1200
x18670
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x9565
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x18614
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x24508
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x27363
1829B
Blank Space
implementation
800
x41557
1829A
Love Story
implementation
,
strings
800
x46774
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1518
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x14612
1824A
LuoTianyi and the Show
greedy
,
implementation
1400
x10903
1822A
TubeTube Feed
brute force
,
implementation
800
x23729
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x13718
1820A
Yura's New Name
implementation
,
strings
800
x16414
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1406
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3455
1818A
Politics
greedy
,
implementation
800
x12737
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x676
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2881
1814A
Coins
implementation
,
math
800
x26174
1812G
Colour Vision
*special problem
,
implementation
x530
1812B
Was it Rated?
*special problem
,
*special problem
,
*special problem
,
brute force
,
implementation
x5594
1811F
Is It Flower?
dfs and similar
,
graphs
,
implementation
2100
x1745
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7110
1811B
Conveyor Belts
implementation
,
math
1000
x19824
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x714
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x797
1809A
Garland
implementation
800
x23488
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x3608
1808A
Lucky Numbers
brute force
,
implementation
900
x17447
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x17926
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x17998
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x5950
1807E
Interview
binary search
,
implementation
,
interactive
1300
x12017
1807D
Odd Queries
data structures
,
implementation
900
x29253
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x29364
1807A
Plus or Minus
implementation
800
x56785
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x829
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x194
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4447
1804B
Vaccination
greedy
,
implementation
1000
x13840
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x12975
1802A
Likes
greedy
,
implementation
800
x15556
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1949
1800A
Is It a Cat?
implementation
,
strings
800
x30203
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1164
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11399
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x15997
1798A
Showstopper
greedy
,
implementation
,
sortings
800
x19399
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3730
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x17013
1796B
Asterisk-Minor Template
implementation
,
strings
1000
x16114
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18608
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x11596
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23306
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1023
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1304
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5828
1791C
Prepend and Append
implementation
,
two pointers
800
x41264
1791B
Following Directions
geometry
,
implementation
800
x42237
1791A
Codeforces Checking
implementation
,
strings
800
x55894
1790C
Premutation
brute force
,
implementation
,
math
1000
x23111
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x35848
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x523
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x774
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1591
1789C
Serval and Toxel's Arrays
combinatorics
,
dp
,
implementation
,
math
1500
x8153
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15856
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x801
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x19373
1788A
One and Two
brute force
,
implementation
,
math
800
x28039
1787F
Inverse Transformation
constructive algorithms
,
implementation
,
math
2500
x635
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3288
1786A2
Alternating Deck (hard version)
implementation
800
x11255
1786A1
Non-alternating Deck (easy version)
implementation
800
x13638
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x414
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4229
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1273
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7147
1778A
Flip Flop Sum
greedy
,
implementation
800
x23830
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implementation
combine-tags-by-or
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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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