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Codeforces Round 973 (Div. 2)
13:21:38
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Difficulty:
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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
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1666
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3833
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x12886
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1218
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x4354
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x820
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1412
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3795
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x21252
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1213
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x4358
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x8380
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x769
1952F
Grid
brute force
x1730
1952C
They Have Fooled
brute force
,
schedules
x2873
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3547
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x8927
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x14074
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x22783
1949E
Damage per Second
brute force
,
math
2900
x98
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x3015
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x101
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x675
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2908
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x9190
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x16408
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x22582
1948A
Special Characters
brute force
,
constructive algorithms
800
x28220
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4604
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x628
1945C
Left and Right Houses
brute force
1200
x14617
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x424
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1423
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x682
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x29299
1941A
Rudolf and the Ticket
brute force
,
math
800
x41849
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1333
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x8025
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x220
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x18523
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x958
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x22329
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x15431
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x28650
1931A
Recovering a Small String
brute force
,
strings
800
x35806
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x700
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x4044
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x15005
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1762
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1655
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x14576
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1680
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x4180
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x8372
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x20994
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x27593
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1665
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x19744
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x371
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5604
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1224
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3790
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x9664
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x939
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5501
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x13285
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x27519
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x10280
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x21839
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x607
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x8430
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x41604
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1818
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x12056
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x21258
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x14833
1909F1
Small Permutation Problem (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2200
x1760
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1350
1907G
Lights
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
2200
x1892
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x10053
1906A
Easy As ABC
brute force
1000
x4003
1905F
Field Should Not Be Empty
brute force
,
data structures
,
divide and conquer
2600
x522
1904D1
Set To Max (Easy Version)
brute force
,
constructive algorithms
,
greedy
1600
x6586
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x12730
1904A
Forked!
brute force
,
implementation
900
x19408
1903D1
Maximum And Queries (easy version)
binary search
,
bitmasks
,
brute force
,
greedy
1700
x5626
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x12634
1903A
Halloumi Boxes
brute force
,
greedy
,
sortings
800
x31226
1902C
Insert and Equalize
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1300
x13591
1902B
Getting Points
binary search
,
brute force
,
greedy
1100
x14296
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x4133
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x20399
1898F
Vova Escapes the Matrix
brute force
,
dfs and similar
,
divide and conquer
,
shortest paths
2600
x811
1898A
Milica and String
brute force
,
implementation
,
strings
800
x15932
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x101
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x87
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1550
1895C
Torn Lucky Ticket
brute force
,
dp
,
hashing
,
implementation
,
math
1400
x11007
1893C
Freedom of Choice
brute force
,
greedy
,
implementation
2000
x2626
1893A
Anonymous Informant
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x12226
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