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Educational Codeforces Round 166 (Rated for Div. 2)
38:31:49
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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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Custom test
Problems
#
Name
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1165
1839C
Insert Zero and Invert Prefix
constructive algorithms
1300
x11434
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x302
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
1400
x13579
1838B
Minimize Permutation Subarrays
constructive algorithms
,
math
1100
x15880
1838A
Blackboard List
constructive algorithms
,
math
800
x21117
1837D
Bracket Coloring
constructive algorithms
,
greedy
1400
x13593
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21216
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x29510
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x945
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4981
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6807
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x12772
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1804
1831B
Array merging
constructive algorithms
,
greedy
1000
x18735
1831A
Twin Permutations
constructive algorithms
800
x24520
1828A
Divisible Array
constructive algorithms
,
math
800
x23085
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x110
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x364
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3672
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x15845
1822D
Super-Permutation
constructive algorithms
,
math
1200
x16007
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1405
1818B
Indivisible
constructive algorithms
900
x14129
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x676
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x3892
1816B
Grid Reconstruction
constructive algorithms
,
greedy
1000
x14758
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x16974
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x214
1815C
Between
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2200
x1882
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2876
1814C
Search in Parallel
constructive algorithms
,
greedy
,
sortings
1500
x10259
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5805
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x3953
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4345
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7095
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x19015
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17199
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x5937
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x11998
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7256
1806B
Mex Master
constructive algorithms
,
greedy
900
x17097
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8174
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12149
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12219
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1162
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x10880
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x9178
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7271
1797B
Li Hua and Pattern
constructive algorithms
,
greedy
1100
x14697
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x16994
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1062
1794B
Not Dividing
constructive algorithms
,
greedy
,
math
900
x19812
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18361
1793B
Fedya and Array
constructive algorithms
,
math
1100
x15284
1790G
Tokens on Graph
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2300
x1073
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x14291
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1589
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x800
1788C
Matching Numbers
constructive algorithms
,
greedy
,
math
1300
x16566
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x19338
1787F
Inverse Transformation
constructive algorithms
,
implementation
,
math
2500
x635
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2198
1787A
Exponential Equation
constructive algorithms
,
math
800
x18796
1784B
Letter Exchange
constructive algorithms
1900
x3233
1783B
Matrix of Differences
constructive algorithms
,
math
1100
x17239
1783A
Make it Beautiful
constructive algorithms
,
math
,
sortings
800
x27646
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x216
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7129
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4680
1780A
Hayato and School
constructive algorithms
,
greedy
800
x21117
1779G
The Game of the Century
constructive algorithms
,
graphs
,
shortest paths
3000
x304
1779F
Xorcerer's Stones
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x1225
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1706
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7558
1779B
MKnez's ConstructiveForces Task
constructive algorithms
,
math
900
x23081
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x22925
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1964
1776F
Train Splitting
constructive algorithms
,
graphs
,
greedy
1700
x3268
1776D
Teamwork
constructive algorithms
,
greedy
,
math
2800
x340
1775F
Laboratory on Pluto
constructive algorithms
,
dp
,
greedy
,
math
2500
x745
1775B
Gardener and the Array
bitmasks
,
constructive algorithms
1300
x12712
1775A2
Gardener and the Capybaras (hard version)
constructive algorithms
,
greedy
900
x18332
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x19349
1774H
Maximum Permutation
constructive algorithms
3500
x129
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x384
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7471
1774C
Ice and Fire
constructive algorithms
,
dp
,
greedy
1300
x11621
1774B
Coloring
constructive algorithms
,
greedy
,
math
1500
x11657
1774A
Add Plus Minus Sign
constructive algorithms
,
math
800
x22028
1773K
King's Puzzle
constructive algorithms
1900
x1385
1773J
Jumbled Trees
constructive algorithms
,
math
2900
x102
1773F
Football
constructive algorithms
800
x3959
1773A
Amazing Trick
constructive algorithms
,
graph matchings
,
math
,
probabilities
1900
x1485
1772F
Copy of a Copy of a Copy
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
sortings
2000
x2243
1772D
Absolute Sorting
constructive algorithms
,
math
1400
x15069
1772C
Different Differences
constructive algorithms
,
greedy
,
math
1000
x22782
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x13047
1770H
Koxia, Mahiru and Winter Festival
constructive algorithms
3500
x99
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3687
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