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Codeforces Round 940 (Div. 2) and CodeCraft-23
33:46:54
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Difficulty:
—
implementation
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
1120B
Once in a casino
constructive algorithms
,
greedy
,
implementation
,
math
2700
x404
1358F
Tasty Cookie
binary search
,
constructive algorithms
,
greedy
,
implementation
2700
x434
70E
Information Reform
dp
,
implementation
,
trees
2700
x475
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x482
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x505
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x509
1621F
Strange Instructions
data structures
,
greedy
,
implementation
2700
x530
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x545
1627F
Not Splitting
geometry
,
graphs
,
greedy
,
implementation
,
shortest paths
2700
x550
1774F2
Magician and Pigs (Hard Version)
binary search
,
brute force
,
data structures
,
implementation
2700
x631
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x662
1421E
Swedish Heroes
brute force
,
dp
,
implementation
2700
x668
1567F
One-Four Overload
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
2700
x726
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x726
1720E
Misha and Paintings
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
2700
x732
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x826
1149C
Tree Generator™
data structures
,
implementation
,
trees
2700
x1160
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1298
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1521
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x175
1505G
Encoded message
*special problem
,
implementation
2600
x290
761F
Dasha and Photos
brute force
,
data structures
,
dp
,
implementation
2600
x400
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x443
685D
Kay and Eternity
brute force
,
implementation
,
sortings
2600
x476
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x488
484C
Strange Sorting
implementation
,
math
2600
x579
1896F
Bracket Xoring
constructive algorithms
,
greedy
,
implementation
,
math
2600
x638
7E
Defining Macros
dp
,
expression parsing
,
implementation
2600
x686
763C
Timofey and remoduling
brute force
,
implementation
,
math
,
number theory
2600
x700
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x725
1848E
Vika and Stone Skipping
brute force
,
implementation
,
math
,
number theory
2600
x735
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x735
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x757
1569E
Playoff Restoration
bitmasks
,
brute force
,
hashing
,
implementation
,
meet-in-the-middle
2600
x782
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x801
1368F
Lamps on a Circle
games
,
implementation
,
interactive
,
math
2600
x841
1566F
Points Movement
data structures
,
dp
,
greedy
,
implementation
,
sortings
2600
x923
1301F
Super Jaber
dfs and similar
,
graphs
,
implementation
,
shortest paths
2600
x1035
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1262
1439C
Greedy Shopping
binary search
,
data structures
,
divide and conquer
,
greedy
,
implementation
2600
x1670
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x1812
1090G
Combostone
games
,
implementation
2500
x102
363E
Two Circles
brute force
,
data structures
,
implementation
2500
x191
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x245
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x269
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x292
294D
Shaass and Painter Robot
brute force
,
implementation
,
number theory
2500
x297
44G
Shooting Gallery
data structures
,
implementation
2500
x357
852A
Digits
brute force
,
implementation
,
math
2500
x364
930D
Game with Tokens
data structures
,
games
,
implementation
2500
x392
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x402
93C
Azembler
brute force
,
implementation
2500
x407
1228F
One Node is Gone
constructive algorithms
,
implementation
,
trees
2500
x415
832C
Strange Radiation
binary search
,
implementation
,
math
2500
x426
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x453
611F
New Year and Cleaning
binary search
,
implementation
2500
x453
1468I
Plane Tiling
geometry
,
implementation
,
math
2500
x468
1310B
Double Elimination
dp
,
implementation
2500
x487
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x504
1186E
Vus the Cossack and a Field
divide and conquer
,
implementation
,
math
2500
x554
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x587
1787F
Inverse Transformation
constructive algorithms
,
implementation
,
math
2500
x624
383B
Volcanoes
binary search
,
implementation
,
sortings
,
two pointers
2500
x651
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x656
976D
Degree Set
constructive algorithms
,
graphs
,
implementation
2500
x664
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x701
15D
Map
data structures
,
implementation
,
sortings
2500
x706
501E
Misha and Palindrome Degree
binary search
,
combinatorics
,
implementation
2500
x717
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x754
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x757
1891E
Brukhovich and Exams
brute force
,
greedy
,
implementation
,
math
,
sortings
2500
x767
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x776
1904E
Tree Queries
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2500
x795
555D
Case of a Top Secret
binary search
,
implementation
,
math
2500
x856
1574E
Coloring
combinatorics
,
constructive algorithms
,
implementation
,
math
2500
x857
1701F
Points
combinatorics
,
data structures
,
implementation
,
math
,
matrices
2500
x879
1374E2
Reading Books (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
ternary search
,
two pointers
2500
x896
1539E
Game with Cards
binary search
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2500
x920
1517E
Group Photo
binary search
,
data structures
,
implementation
,
two pointers
2500
x944
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x946
407C
Curious Array
brute force
,
combinatorics
,
implementation
,
math
2500
x949
1239B
The World Is Just a Programming Task (Hard Version)
implementation
2500
x957
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1000
1188A2
Add on a Tree: Revolution
constructive algorithms
,
dfs and similar
,
implementation
,
trees
2500
x1066
1307E
Cow and Treats
binary search
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
2500
x1073
1313D
Happy New Year
bitmasks
,
dp
,
implementation
2500
x1100
706E
Working routine
data structures
,
implementation
2500
x1112
1137C
Museums Tour
dp
,
graphs
,
implementation
2500
x1152
923D
Picking Strings
constructive algorithms
,
implementation
,
strings
2500
x1152
1492E
Almost Fault-Tolerant Database
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
2500
x1158
1301E
Nanosoft
binary search
,
data structures
,
dp
,
implementation
2500
x1193
1845E
Boxes and Balls
dp
,
implementation
,
math
2500
x1253
734F
Anton and School
bitmasks
,
constructive algorithms
,
implementation
,
math
2500
x1276
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1387
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x1416
551E
GukiZ and GukiZiana
binary search
,
data structures
,
implementation
2500
x1647
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1794
39G
Inverse Function
implementation
2400
x122
331D1
Escaping on Beaveractor
dfs and similar
,
implementation
2400
x193
97A
Domino
brute force
,
implementation
2400
x249
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