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Before contest
Codeforces Round 941 (Div. 1)
24:44:23
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Before contest
Codeforces Round 941 (Div. 2)
24:44:23
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brute force
combine-tags-by-or
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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
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probabilities
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ternary search
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Problems
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Name
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
x785
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
x3006
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x574
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1092
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x2842
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x17670
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x912
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3049
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x6573
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x673
1952F
Grid
brute force
x1617
1952C
They Have Fooled
brute force
,
schedules
x2675
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2850
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x7152
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x11291
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x19431
1949E
Damage per Second
brute force
,
math
x77
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
x1527
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
x80
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x579
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2533
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x7978
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x14037
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x20053
1948A
Special Characters
brute force
,
constructive algorithms
800
x25818
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x3881
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x461
1945C
Left and Right Houses
brute force
1200
x12402
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x330
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1182
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x529
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x25961
1941A
Rudolf and the Ticket
brute force
,
math
800
x38376
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1145
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7026
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x171
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x16351
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x850
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x20200
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x13410
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x25769
1931A
Recovering a Small String
brute force
,
strings
800
x33288
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x599
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3646
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x13408
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1604
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1476
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x13072
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1509
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3695
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x7370
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18050
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x25313
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1446
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x18068
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x319
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5142
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1108
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3405
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x8823
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x867
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5055
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x11698
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x26365
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x9311
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19212
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x581
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x7834
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x38127
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1652
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x11053
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x17938
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x13524
1909F1
Small Permutation Problem (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2200
x1618
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1234
1907G
Lights
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
2200
x1729
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x8695
1906A
Easy As ABC
brute force
1000
x3486
1905F
Field Should Not Be Empty
brute force
,
data structures
,
divide and conquer
2600
x442
1904D1
Set To Max (Easy Version)
brute force
,
constructive algorithms
,
greedy
1600
x5602
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x10460
1904A
Forked!
brute force
,
implementation
900
x15597
1903D1
Maximum And Queries (easy version)
binary search
,
bitmasks
,
brute force
,
greedy
1700
x5017
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x11239
1903A
Halloumi Boxes
brute force
,
greedy
,
sortings
800
x23599
1902C
Insert and Equalize
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1300
x12133
1902B
Getting Points
binary search
,
brute force
,
greedy
1100
x13234
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3664
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x17927
1898F
Vova Escapes the Matrix
brute force
,
dfs and similar
,
divide and conquer
,
shortest paths
2600
x733
1898A
Milica and String
brute force
,
implementation
,
strings
800
x14974
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x85
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x77
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1449
1895C
Torn Lucky Ticket
brute force
,
dp
,
hashing
,
implementation
,
math
1400
x10033
1893C
Freedom of Choice
brute force
,
greedy
,
implementation
2000
x2411
1893A
Anonymous Informant
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x11176
1891E
Brukhovich and Exams
brute force
,
greedy
,
implementation
,
math
,
sortings
2500
x769
1891D
Suspicious logarithms
binary search
,
brute force
,
math
1900
x3683
1891B
Deja Vu
brute force
,
math
,
sortings
1100
x15603
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