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Codeforces Round 945 (Div. 2)
3 days
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*has extra registration
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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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Problems
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Status
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Custom test
Problems
#
Name
1838B
Minimize Permutation Subarrays
constructive algorithms
,
math
1100
x15833
1838A
Blackboard List
constructive algorithms
,
math
800
x21072
1837D
Bracket Coloring
constructive algorithms
,
greedy
1400
x13374
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21128
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x29203
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x939
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4951
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6722
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x12706
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1797
1831B
Array merging
constructive algorithms
,
greedy
1000
x18550
1831A
Twin Permutations
constructive algorithms
800
x24305
1828A
Divisible Array
constructive algorithms
,
math
800
x23025
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x107
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x363
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3654
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x15817
1822D
Super-Permutation
constructive algorithms
,
math
1200
x15924
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1396
1818B
Indivisible
constructive algorithms
900
x14052
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x668
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x3870
1816B
Grid Reconstruction
constructive algorithms
,
greedy
1000
x14709
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x16939
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x214
1815C
Between
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2200
x1867
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2863
1814C
Search in Parallel
constructive algorithms
,
greedy
,
sortings
1500
x10199
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5796
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x3948
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4339
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7050
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x18929
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17148
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x5902
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x11938
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7206
1806B
Mex Master
constructive algorithms
,
greedy
900
x17037
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8124
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12075
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12168
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1156
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x10826
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x9074
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7240
1797B
Li Hua and Pattern
constructive algorithms
,
greedy
1100
x14550
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x16947
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1053
1794B
Not Dividing
constructive algorithms
,
greedy
,
math
900
x19547
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18193
1793B
Fedya and Array
constructive algorithms
,
math
1100
x15237
1790G
Tokens on Graph
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2300
x1057
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x14198
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1576
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x795
1788C
Matching Numbers
constructive algorithms
,
greedy
,
math
1300
x16492
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x19270
1787F
Inverse Transformation
constructive algorithms
,
implementation
,
math
2500
x632
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2183
1787A
Exponential Equation
constructive algorithms
,
math
800
x18752
1784B
Letter Exchange
constructive algorithms
1900
x3214
1783B
Matrix of Differences
constructive algorithms
,
math
1100
x17182
1783A
Make it Beautiful
constructive algorithms
,
math
,
sortings
800
x27356
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x214
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7064
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4651
1780A
Hayato and School
constructive algorithms
,
greedy
800
x21085
1779G
The Game of the Century
constructive algorithms
,
graphs
,
shortest paths
3000
x301
1779F
Xorcerer's Stones
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x1220
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1689
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7512
1779B
MKnez's ConstructiveForces Task
constructive algorithms
,
math
900
x23026
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x22897
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1954
1776F
Train Splitting
constructive algorithms
,
graphs
,
greedy
1700
x3239
1776D
Teamwork
constructive algorithms
,
greedy
,
math
2800
x339
1775F
Laboratory on Pluto
constructive algorithms
,
dp
,
greedy
,
math
2500
x742
1775B
Gardener and the Array
bitmasks
,
constructive algorithms
1300
x12581
1775A2
Gardener and the Capybaras (hard version)
constructive algorithms
,
greedy
900
x18280
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x19318
1774H
Maximum Permutation
constructive algorithms
3500
x129
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x366
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7440
1774C
Ice and Fire
constructive algorithms
,
dp
,
greedy
1300
x11568
1774B
Coloring
constructive algorithms
,
greedy
,
math
1500
x11601
1774A
Add Plus Minus Sign
constructive algorithms
,
math
800
x21958
1773K
King's Puzzle
constructive algorithms
1900
x1381
1773J
Jumbled Trees
constructive algorithms
,
math
2900
x101
1773F
Football
constructive algorithms
800
x3951
1773A
Amazing Trick
constructive algorithms
,
graph matchings
,
math
,
probabilities
1900
x1481
1772F
Copy of a Copy of a Copy
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
sortings
2000
x2233
1772D
Absolute Sorting
constructive algorithms
,
math
1400
x14955
1772C
Different Differences
constructive algorithms
,
greedy
,
math
1000
x22711
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x12875
1770H
Koxia, Mahiru and Winter Festival
constructive algorithms
3500
x98
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3676
1770B
Koxia and Permutation
constructive algorithms
1000
x19026
1768D
Lucky Permutation
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1800
x6708
1768C
Elemental Decompress
constructive algorithms
,
greedy
,
implementation
,
sortings
1300
x13571
1767D
Playoff
combinatorics
,
constructive algorithms
,
dp
,
greedy
,
math
1500
x9436
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