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Codeforces Round 940 (Div. 2)
3 days
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Difficulty:
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bitmasks
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
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1432
1242C
Sum Balance
bitmasks
,
dfs and similar
,
dp
,
graphs
2400
x1463
1401F
Reverse and Swap
binary search
,
bitmasks
,
data structures
2400
x1464
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1487
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1540
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1717
1114F
Please, another Queries on Array?
bitmasks
,
data structures
,
divide and conquer
,
math
,
number theory
2400
x1804
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1831
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1844
1257F
Make Them Similar
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
2400
x1922
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x1930
1523D
Love-Hate
bitmasks
,
brute force
,
dp
,
probabilities
2400
x2068
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2407
449D
Jzzhu and Numbers
bitmasks
,
combinatorics
,
dp
2400
x4034
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x320
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x805
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x836
429C
Guess the Tree
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
trees
2300
x898
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1079
327E
Axis Walking
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
meet-in-the-middle
2300
x1335
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1360
1548D1
Gregor and the Odd Cows (Easy)
bitmasks
,
geometry
,
math
,
number theory
2300
x1424
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1464
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1551
1245F
Daniel and Spring Cleaning
bitmasks
,
brute force
,
combinatorics
,
dp
2300
x1714
1093G
Multidimensional Queries
bitmasks
,
data structures
2300
x1817
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x1962
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x1964
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x2184
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2236
1073E
Segment Sum
bitmasks
,
combinatorics
,
dp
,
math
2300
x2371
1658D2
388535 (Hard Version)
bitmasks
,
brute force
,
data structures
,
math
2300
x2425
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2678
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x2819
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x3206
1316E
Team Building
bitmasks
,
dp
,
greedy
,
sortings
2300
x3382
888G
Xor-MST
bitmasks
,
constructive algorithms
,
data structures
2300
x3851
903F
Clear The Matrix
bitmasks
,
dp
2200
x622
71E
Nuclear Fusion
bitmasks
,
dp
2200
x667
279D
The Minimum Number of Variables
bitmasks
,
dp
2200
x678
385D
Bear and Floodlight
bitmasks
,
dp
,
geometry
2200
x793
868D
Huge Strings
bitmasks
,
brute force
,
dp
,
implementation
,
strings
2200
x889
225D
Snake
bitmasks
,
dfs and similar
,
graphs
,
implementation
2200
x910
377C
Captains Mode
bitmasks
,
dp
,
games
2200
x1101
757D
Felicity's Big Secret Revealed
bitmasks
,
dp
2200
x1264
425B
Sereja and Table
bitmasks
,
greedy
2200
x1279
850C
Arpa and a game with Mojtaba
bitmasks
,
dp
,
games
2200
x1348
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1402
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1421
1117E
Decypher the String
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
interactive
,
math
2200
x1440
1659E
AND-MEX Walk
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2200
x1452
743E
Vladik and cards
binary search
,
bitmasks
,
brute force
,
dp
2200
x1466
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1557
1105E
Helping Hiasat
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2200
x1576
855E
Salazar Slytherin's Locket
bitmasks
,
dp
2200
x1604
1670E
Hemose on the Tree
bitmasks
,
constructive algorithms
,
dfs and similar
,
trees
2200
x1660
920G
List Of Integers
binary search
,
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2200
x1668
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1675
1194E
Count The Rectangles
bitmasks
,
brute force
,
data structures
,
geometry
,
sortings
2200
x1727
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1810
1622E
Math Test
bitmasks
,
brute force
,
greedy
2200
x1828
678E
Another Sith Tournament
bitmasks
,
dp
,
math
,
probabilities
2200
x1894
875D
High Cry
binary search
,
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
2200
x1963
981E
Addition on Segments
bitmasks
,
data structures
,
divide and conquer
,
dp
2200
x1987
1168C
And Reachability
bitmasks
,
dp
2200
x2318
1234F
Yet Another Substring Reverse
bitmasks
,
dp
2200
x2351
707D
Persistent Bookcase
bitmasks
,
data structures
,
dfs and similar
,
implementation
2200
x2589
1238E
Keyboard Purchase
bitmasks
,
dp
2200
x2719
1215E
Marbles
bitmasks
,
dp
2200
x2903
1338C
Perfect Triples
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
math
2200
x2952
1854B
Earn or Unlock
bitmasks
,
brute force
,
dp
2200
x3294
282E
Sausage Maximization
bitmasks
,
data structures
,
trees
2200
x3339
1438D
Powerful Ksenia
bitmasks
,
constructive algorithms
,
math
2200
x4051
11D
A Simple Task
bitmasks
,
dp
,
graphs
2200
x4400
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x6141
570D
Tree Requests
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2200
x6606
342D
Xenia and Dominoes
bitmasks
,
dfs and similar
,
dp
2100
x486
400E
Inna and Binary Logic
binary search
,
bitmasks
,
data structures
2100
x930
1725F
Field Photography
bitmasks
,
data structures
,
sortings
2100
x931
111C
Petya and Spiders
bitmasks
,
dp
,
dsu
2100
x1255
993C
Careful Maneuvering
bitmasks
,
brute force
,
geometry
2100
x1477
1185F
Two Pizzas
bitmasks
,
brute force
2100
x1796
333D
Characteristics of Rectangles
binary search
,
bitmasks
,
brute force
,
implementation
,
sortings
2100
x1842
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2101
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2161
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2253
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2314
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2438
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2453
1185G1
Playlist for Polycarp (easy version)
bitmasks
,
combinatorics
,
dp
2100
x2544
768E
Game of Stones
bitmasks
,
dp
,
games
2100
x2626
1166E
The LCMs Must be Large
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2100
x2638
1748D
ConstructOR
bitmasks
,
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
math
,
number theory
2100
x2644
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x2716
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2786
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x2800
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2830
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x2970
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x3231
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3376
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