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Before contest
Codeforces Round (Div. 2)
5 days
→ Filter Problems
Difficulty:
—
constructive algorithms
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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Custom test
Problems
#
Name
1837D
Bracket Coloring
constructive algorithms
,
greedy
x8409
1837C
Best Binary String
constructive algorithms
,
greedy
x15016
1837A
Grasshopper on a Line
constructive algorithms
,
math
x20335
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x2591
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x3876
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x8703
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1216
1831B
Array merging
constructive algorithms
,
greedy
x9537
1831A
Twin Permutations
constructive algorithms
x13730
1828A
Divisible Array
constructive algorithms
,
math
800
x17733
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x52
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x154
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x2666
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x12968
1822D
Super-Permutation
constructive algorithms
,
math
1200
x11413
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1027
1818B
Indivisible
constructive algorithms
900
x10229
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x432
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x2633
1816B
Grid Reconstruction
constructive algorithms
,
greedy
1000
x12154
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x14537
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x123
1815C
Between
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2200
x1376
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2209
1814C
Search in Parallel
constructive algorithms
,
greedy
,
sortings
1500
x7592
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x5164
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x15206
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x15078
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x4465
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x9097
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x5699
1806B
Mex Master
constructive algorithms
,
greedy
900
x14372
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x6466
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x8982
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x9237
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x936
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x8614
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x6804
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x5579
1797B
Li Hua and Pattern
constructive algorithms
,
greedy
1100
x11537
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x14369
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x845
1794B
Not Dividing
constructive algorithms
,
greedy
,
math
900
x14796
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x13377
1793B
Fedya and Array
constructive algorithms
,
math
1100
x13210
1790G
Tokens on Graph
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2300
x840
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x11090
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1300
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x615
1788C
Matching Numbers
constructive algorithms
,
greedy
,
math
1300
x13249
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x16049
1787F
Inverse Transformation
constructive algorithms
,
implementation
,
math
2500
x552
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x1795
1787A
Exponential Equation
constructive algorithms
,
math
800
x17255
1784B
Letter Exchange
constructive algorithms
1900
x2790
1783B
Matrix of Differences
constructive algorithms
,
math
1100
x15506
1783A
Make it Beautiful
constructive algorithms
,
math
,
sortings
800
x23378
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x173
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x5783
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x3795
1780A
Hayato and School
constructive algorithms
,
greedy
800
x19384
1779G
The Game of the Century
constructive algorithms
,
graphs
,
shortest paths
3000
x247
1779F
Xorcerer's Stones
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x1047
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1454
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x6167
1779B
MKnez's ConstructiveForces Task
constructive algorithms
,
math
900
x20542
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x21586
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1502
1776F
Train Splitting
constructive algorithms
,
graphs
,
greedy
1700
x2304
1776D
Teamwork
constructive algorithms
,
greedy
,
math
2800
x264
1775F
Laboratory on Pluto
constructive algorithms
,
dp
,
greedy
,
math
2500
x627
1775B
Gardener and the Array
bitmasks
,
constructive algorithms
1300
x10293
1775A2
Gardener and the Capybaras (hard version)
constructive algorithms
,
greedy
900
x15783
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x17045
1774H
Maximum Permutation
constructive algorithms
3500
x111
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x230
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x6097
1774C
Ice and Fire
constructive algorithms
,
dp
,
greedy
1300
x9961
1774B
Coloring
constructive algorithms
,
greedy
,
math
1500
x9415
1774A
Add Plus Minus Sign
constructive algorithms
,
math
800
x20511
1773K
King's Puzzle
constructive algorithms
1900
x1102
1773J
Jumbled Trees
constructive algorithms
,
math
2900
x75
1773F
Football
constructive algorithms
800
x3302
1773A
Amazing Trick
constructive algorithms
,
graph matchings
,
math
,
probabilities
1900
x1149
1772F
Copy of a Copy of a Copy
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
sortings
2000
x1748
1772D
Absolute Sorting
constructive algorithms
,
math
1400
x11036
1772C
Different Differences
constructive algorithms
,
greedy
,
math
1000
x19126
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x10018
1770H
Koxia, Mahiru and Winter Festival
constructive algorithms
3500
x66
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3202
1770B
Koxia and Permutation
constructive algorithms
1000
x17252
1768D
Lucky Permutation
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1800
x5478
1768C
Elemental Decompress
constructive algorithms
,
greedy
,
implementation
,
sortings
1300
x11545
1767D
Playoff
combinatorics
,
constructive algorithms
,
dp
,
greedy
,
math
1500
x7909
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x275
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x2974
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x755
1763C
Another Array Problem
brute force
,
constructive algorithms
,
greedy
2000
x5360
1763A
Absolute Maximization
bitmasks
,
constructive algorithms
,
greedy
,
math
800
x13990
1762G
Unequal Adjacent Elements
constructive algorithms
,
sortings
3100
x64
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