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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
Register now »
*has extra registration
→ Filter Problems
Difficulty:
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two pointers
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
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x141
1753F
Minecraft Series
brute force
,
two pointers
3500
x184
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x266
1034D
Intervals of Intervals
binary search
,
data structures
,
two pointers
3500
x429
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x146
1693F
I Might Be Wrong
binary search
,
greedy
,
two pointers
3400
x273
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x53
771F
Bear and Isomorphic Points
geometry
,
two pointers
3300
x77
696F
...Dary!
binary search
,
geometry
,
two pointers
3300
x118
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x185
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x294
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x301
744E
Hongcow Masters the Cyclic Shift
strings
,
two pointers
3200
x131
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x185
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x289
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x343
780H
Intranet of Buses
binary search
,
geometry
,
implementation
,
two pointers
3100
x115
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x318
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x395
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x522
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x347
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x425
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x445
627E
Orchestra
two pointers
3000
x528
364E
Empty Rectangles
divide and conquer
,
two pointers
3000
x529
1446D2
Frequency Problem (Hard Version)
data structures
,
greedy
,
two pointers
3000
x1198
618F
Double Knapsack
constructive algorithms
,
two pointers
3000
x1298
1901F
Landscaping
binary search
,
geometry
,
two pointers
2900
x141
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x162
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x408
611G
New Year and Cake
geometry
,
two pointers
2900
x421
1372E
Omkar and Last Floor
dp
,
greedy
,
two pointers
2900
x959
406E
Hamming Triples
implementation
,
math
,
two pointers
2800
x225
261E
Maxim and Calculator
brute force
,
dp
,
two pointers
2800
x402
722F
Cyclic Cipher
chinese remainder theorem
,
data structures
,
implementation
,
number theory
,
two pointers
2800
x468
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x590
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x720
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x1072
516D
Drazil and Morning Exercise
dfs and similar
,
dp
,
dsu
,
trees
,
two pointers
2800
x1219
592E
BCPC
binary search
,
geometry
,
two pointers
2700
x207
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x207
293D
Ksusha and Square
geometry
,
math
,
probabilities
,
two pointers
2700
x232
48G
Galaxy Union
dp
,
trees
,
two pointers
2700
x251
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x283
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x387
1131G
Most Dangerous Shark
data structures
,
dp
,
two pointers
2700
x398
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x467
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x505
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x570
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x695
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x794
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1035
1431H
Rogue-like Game
*special problem
,
brute force
,
greedy
,
two pointers
2600
x63
1599A
Weights
constructive algorithms
,
greedy
,
two pointers
2600
x631
682E
Alyona and Triangles
geometry
,
two pointers
2600
x644
1500C
Matrix Sorting
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
two pointers
2600
x759
1684F
Diverse Segments
data structures
,
two pointers
2600
x840
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x858
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x886
372D
Choosing Subtree is Fun
binary search
,
data structures
,
dfs and similar
,
trees
,
two pointers
2600
x905
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x917
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x963
1699E
Three Days Grace
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2600
x1071
1437F
Emotional Fishermen
combinatorics
,
dp
,
math
,
two pointers
2600
x1158
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x269
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x343
264D
Colorful Stones
dp
,
two pointers
2500
x405
989D
A Shade of Moonlight
binary search
,
geometry
,
math
,
sortings
,
two pointers
2500
x502
314D
Sereja and Straight Lines
binary search
,
data structures
,
geometry
,
sortings
,
two pointers
2500
x513
383B
Volcanoes
binary search
,
implementation
,
sortings
,
two pointers
2500
x651
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x656
1312F
Attack on Red Kingdom
games
,
two pointers
2500
x659
55E
Very simple problem
geometry
,
two pointers
2500
x671
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x746
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x802
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x814
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x888
1374E2
Reading Books (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
ternary search
,
two pointers
2500
x896
799E
Aquarium decoration
data structures
,
greedy
,
two pointers
2500
x909
1517E
Group Photo
binary search
,
data structures
,
implementation
,
two pointers
2500
x944
1398F
Controversial Rounds
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2500
x1062
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x1175
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x1287
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
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1436
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1447
1452E
Two Editorials
brute force
,
dp
,
greedy
,
sortings
,
two pointers
2500
x1479
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1555
1327F
AND Segments
bitmasks
,
combinatorics
,
data structures
,
dp
,
two pointers
2500
x1599
1572B
Xor of 3
brute force
,
constructive algorithms
,
greedy
,
two pointers
2500
x1733
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2519
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x283
887D
Ratings and Reality Shows
data structures
,
two pointers
2400
x470
633E
Startup Funding
binary search
,
constructive algorithms
,
data structures
,
probabilities
,
two pointers
2400
x566
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x574
639D
Bear and Contribution
data structures
,
greedy
,
sortings
,
two pointers
2400
x773
581F
Zublicanes and Mumocrates
dp
,
trees
,
two pointers
2400
x839
733E
Sleep in Class
constructive algorithms
,
data structures
,
math
,
two pointers
2400
x855
1194F
Crossword Expert
combinatorics
,
dp
,
number theory
,
probabilities
,
two pointers
2400
x962
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