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Before contest
Codeforces Global Round 26
19:56:39
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Difficulty:
—
brute force
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
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x13981
1909F1
Small Permutation Problem (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2200
x1663
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1270
1907G
Lights
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
2200
x1782
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x9086
1906A
Easy As ABC
brute force
1000
x3634
1905F
Field Should Not Be Empty
brute force
,
data structures
,
divide and conquer
2600
x467
1904D1
Set To Max (Easy Version)
brute force
,
constructive algorithms
,
greedy
1600
x5907
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x11011
1904A
Forked!
brute force
,
implementation
900
x16729
1903D1
Maximum And Queries (easy version)
binary search
,
bitmasks
,
brute force
,
greedy
1700
x5214
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x11655
1903A
Halloumi Boxes
brute force
,
greedy
,
sortings
800
x25774
1902C
Insert and Equalize
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1300
x12572
1902B
Getting Points
binary search
,
brute force
,
greedy
1100
x13523
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3800
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x18602
1898F
Vova Escapes the Matrix
brute force
,
dfs and similar
,
divide and conquer
,
shortest paths
2600
x748
1898A
Milica and String
brute force
,
implementation
,
strings
800
x15251
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x94
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x83
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1470
1895C
Torn Lucky Ticket
brute force
,
dp
,
hashing
,
implementation
,
math
1400
x10284
1893C
Freedom of Choice
brute force
,
greedy
,
implementation
2000
x2477
1893A
Anonymous Informant
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x11458
1891E
Brukhovich and Exams
brute force
,
greedy
,
implementation
,
math
,
sortings
2500
x785
1891D
Suspicious logarithms
binary search
,
brute force
,
math
1900
x3750
1891B
Deja Vu
brute force
,
math
,
sortings
1100
x16240
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x532
1889C1
Doremy's Drying Plan (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x3063
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1601
1886A
Sum of Three
brute force
,
constructive algorithms
,
math
800
x24790
1884C
Medium Design
brute force
,
data structures
,
dp
,
greedy
,
sortings
1700
x5582
1884A
Simple Design
brute force
,
greedy
,
math
800
x16645
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x969
1882C
Card Game
brute force
,
greedy
1500
x11511
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x14544
1881C
Perfect Square
brute force
,
implementation
1200
x16114
1881A
Don't Try to Count
brute force
,
strings
800
x28290
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x476
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1194
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1106
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
1900
x3864
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x118
1875A
Jellyfish and Undertale
brute force
,
greedy
900
x22497
1874B
Jellyfish and Math
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x1079
1874A
Jellyfish and Game
brute force
,
games
,
greedy
,
implementation
1200
x16096
1873B
Good Kid
brute force
,
greedy
,
math
800
x45337
1873A
Short Sort
brute force
,
implementation
800
x49841
1872G
Replace With Product
brute force
,
greedy
,
math
2000
x4046
1872A
Two Vessels
brute force
,
greedy
,
math
800
x37737
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x2231
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x402
1867D
Cyclic Operations
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
1800
x5432
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x698
1866L
Lihmuf Balling
binary search
,
brute force
,
math
2400
x660
1864D
Matrix Cascade
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
1700
x6427
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2644
1862F
Magic Will Save the World
binary search
,
bitmasks
,
brute force
,
dp
1800
x5797
1860B
Fancy Coins
binary search
,
brute force
,
greedy
,
math
1200
x16237
1859E
Maximum Monogonosity
brute force
,
dp
,
math
2500
x1681
1859C
Another Permutation Problem
brute force
,
dp
,
greedy
,
math
1200
x16458
1858E1
Rollbacks (Easy Version)
brute force
,
data structures
,
dfs and similar
,
trees
2500
x1261
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2723
1858B
The Walkway
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x10784
1856C
To Become Max
binary search
,
brute force
,
data structures
,
dp
1600
x11284
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x24390
1854F
Mark and Spaceship
brute force
,
dp
3500
x116
1854E
Game Bundles
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
3000
x386
1854B
Earn or Unlock
bitmasks
,
brute force
,
dp
2200
x3380
1853B
Fibonaccharsis
binary search
,
brute force
,
math
1200
x16698
1853A
Desorting
brute force
,
greedy
,
math
800
x29037
1851A
Escalator Conversations
brute force
,
constructive algorithms
,
math
800
x28864
1850F
We Were Both Children
brute force
,
implementation
,
math
,
number theory
1300
x17593
1850D
Balanced Round
brute force
,
greedy
,
implementation
,
sortings
900
x33211
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x9972
1848E
Vika and Stone Skipping
brute force
,
implementation
,
math
,
number theory
2600
x752
1848D
Vika and Bonuses
binary search
,
brute force
,
math
,
ternary search
2200
x2531
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x320
1847C
Vampiric Powers, anyone?
bitmasks
,
brute force
,
dp
,
greedy
1400
x12342
1846E2
Rudolf and Snowflakes (hard version)
binary search
,
brute force
,
implementation
,
math
1800
x6661
1846E1
Rudolf and Snowflakes (simple version)
brute force
,
implementation
,
math
1300
x15652
1846B
Rudolph and Tic-Tac-Toe
brute force
,
implementation
,
strings
800
x26255
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7416
1844F1
Min Cost Permutation (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
math
2600
x740
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x11279
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7387
1840F
Railguns
brute force
,
dfs and similar
,
dp
,
graphs
2200
x1724
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x946
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x909
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7519
1834F
Typewriter
brute force
,
math
2500
x494
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4402
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x12838
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2072
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x20065
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x609
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4638
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x24570
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1158
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