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Codeforces Round (Div. 2)
37:23:23
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Difficulty:
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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
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
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Status
Standings
Custom test
Problems
#
Name
1992E
Novice's Mistake
brute force
,
constructive algorithms
,
implementation
,
math
,
strings
1700
x7283
1989C
Two Movies
greedy
,
math
1400
x15200
1987D
World is Mine
dp
,
games
1800
x5866
1986E
Beautiful Array
greedy
,
math
,
number theory
,
sortings
1700
x7350
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x13204
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
1700
x4629
1985G
D-Function
combinatorics
,
math
,
number theory
1600
x7804
1985F
Final Boss
binary search
,
data structures
1500
x12842
1984C2
Magnitude (Hard Version)
combinatorics
,
dp
,
greedy
,
math
1700
x6454
1983D
Swap Dilemma
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
math
,
sortings
1700
x6904
1983C
Have Your Cake and Eat It Too
binary search
,
brute force
,
greedy
,
implementation
1400
x10659
1982D
Beauty of the mountains
brute force
,
data structures
,
implementation
,
math
,
number theory
1700
x6093
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x4554
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x9181
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x12770
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x5823
1978D
Elections
data structures
,
greedy
,
implementation
,
math
1600
x9648
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x9177
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x5285
1974E
Money Buys Happiness
dp
1800
x7009
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x13394
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x14378
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x7539
1971G
XOUR
data structures
,
dsu
,
sortings
1700
x8244
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x8856
1971E
Find the Car
binary search
,
math
,
sortings
1500
x12636
1970E1
Trails (Easy)
dp
1800
x1650
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x2097
1970C1
Game on Tree (Easy)
games
1400
x2743
1969C
Minimizing the Sum
dp
,
implementation
1700
x7668
1968F
Equal XOR Segments
binary search
,
data structures
1800
x4895
1968E
Cells Arrangement
constructive algorithms
1600
x9446
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x12056
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x11287
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x6030
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x12322
1958D
Staircase
*special problem
1600
x435
1958C
Firewood
*special problem
1500
x599
1958B
Clock in the Pool
*special problem
,
math
1400
x770
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x8811
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x12022
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x6552
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x7974
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x14260
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x5555
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x10817
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x8442
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x13337
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
1800
x1481
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x2609
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8782
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x9975
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x7585
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5858
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5574
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x8922
1938H
Pho Restaurant
1600
x1958
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6981
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x7766
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7639
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6389
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x10502
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x7567
1932D
Card Game
greedy
,
implementation
1400
x10767
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x14818
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x7484
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x14535
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3898
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x6729
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x14058
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x8039
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x13223
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x11094
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x13112
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x6333
1923C
Find B
constructive algorithms
,
greedy
1400
x14154
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x7351
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x9336
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x12613
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x17815
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x13306
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x9876
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x8209
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x5875
1915F
Greetings
data structures
,
divide and conquer
,
sortings
1500
x12632
1914E2
Game with Marbles (Hard Version)
games
,
greedy
,
sortings
1400
x11768
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x11663
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x2229
1910D
Remove and Add
*special problem
,
greedy
1800
x339
1910C
Poisonous Swamp
*special problem
,
*special problem
,
implementation
,
implementation
1600
x613
1910B
Security Guard
*special problem
,
greedy
1600
x650
1909C
Heavy Intervals
constructive algorithms
,
data structures
,
dsu
,
greedy
,
math
,
sortings
1400
x10551
1907F
Shift and Reverse
greedy
,
sortings
1800
x4622
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x9534
1907D
Jumping Through Segments
binary search
,
constructive algorithms
1400
x12952
1906M
Triangle Construction
greedy
,
math
1700
x2471
1905C
Largest Subsequence
greedy
,
strings
1400
x11601
1904D2
Set To Max (Hard Version)
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
sortings
1800
x4103
1904D1
Set To Max (Easy Version)
brute force
,
constructive algorithms
,
greedy
1600
x6213
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x11734
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