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Codeforces Round 973 (Div. 2)
16:05:48
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Difficulty:
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sortings
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
2005B2
The Strict Teacher (Hard Version)
binary search
,
greedy
,
math
,
sortings
x13998
2005B1
The Strict Teacher (Easy Version)
greedy
,
math
,
sortings
x16071
2004C
Splitting Items
games
,
greedy
,
sortings
1100
x21615
2003C
Turtle and Good Pairs
constructive algorithms
,
greedy
,
sortings
,
strings
1200
x16691
2003B
Turtle and Piggy Are Playing a Game 2
games
,
greedy
,
sortings
800
x23499
1996C
Sort
dp
,
greedy
,
sortings
,
strings
1200
x21607
1995B2
Bouquet (Hard Version)
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1700
x8279
1995B1
Bouquet (Easy Version)
binary search
,
brute force
,
greedy
,
sortings
,
two pointers
1100
x17040
1992B
Angry Monk
greedy
,
math
,
sortings
800
x32946
1992A
Only Pluses
brute force
,
constructive algorithms
,
greedy
,
math
,
sortings
800
x39322
1991F
Triangle Formation
brute force
,
greedy
,
implementation
,
math
,
sortings
2200
x2145
1990A
Submission Bait
brute force
,
games
,
greedy
,
sortings
900
x21331
1989D
Smithing Skill
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
,
two pointers
1900
x5667
1986E
Beautiful Array
greedy
,
math
,
number theory
,
sortings
1700
x8365
1986C
Update Queries
data structures
,
greedy
,
sortings
1100
x22207
1986B
Matrix Stabilization
brute force
,
data structures
,
greedy
,
sortings
1000
x25821
1986A
X Axis
brute force
,
geometry
,
math
,
sortings
800
x38862
1984G
Magic Trick II
constructive algorithms
,
implementation
,
sortings
3200
x249
1983D
Swap Dilemma
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
math
,
sortings
1700
x7864
1982F
Sorting Problem Again
binary search
,
data structures
,
sortings
2600
x894
1982A
Soccer
greedy
,
implementation
,
math
,
sortings
800
x24259
1980F2
Field Division (hard version)
math
,
sortings
2400
x943
1980F1
Field Division (easy version)
data structures
,
math
,
sortings
1900
x3598
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x10055
1980B
Choosing Cubes
sortings
,
sortings
800
x33717
1978A
Alice and Books
constructive algorithms
,
greedy
,
sortings
800
x24915
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x6505
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
2800
x523
1976A
Verify Password
implementation
,
sortings
,
strings
800
x27910
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
1000
x17273
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x18221
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
2000
x4073
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3449
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x29541
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
2500
x773
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x8074
1971G
XOUR
data structures
,
dsu
,
sortings
1700
x8885
1971E
Find the Car
binary search
,
math
,
sortings
1500
x13714
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x25222
1971A
My First Sorting Problem
implementation
,
sortings
800
x43374
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x4281
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x4379
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x12120
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x13254
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x337
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x8380
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x27204
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x5916
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x769
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x11374
1949F
Dating
greedy
,
sortings
,
trees
2200
x925
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x3015
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x25720
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x4103
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2728
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5849
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x142
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x35
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x196
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1275
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x8023
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x19874
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x37732
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x4008
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x15470
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x6934
1930A
Maximise The Score
greedy
,
sortings
800
x18339
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x31085
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x17062
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x4271
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2495
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x20362
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x21378
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x20566
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3818
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x854
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1698
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x23490
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x6191
1915F
Greetings
data structures
,
divide and conquer
,
sortings
1500
x13431
1914E2
Game with Marbles (Hard Version)
games
,
greedy
,
sortings
1400
x12211
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x12055
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x21258
1912A
Accumulator Apex
data structures
,
implementation
,
sortings
1900
x2043
1909C
Heavy Intervals
constructive algorithms
,
data structures
,
dsu
,
greedy
,
math
,
sortings
1400
x11010
1907F
Shift and Reverse
greedy
,
sortings
1800
x4814
1906F
Maximize The Value
data structures
,
sortings
2100
x1086
1904D2
Set To Max (Hard Version)
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
sortings
1800
x4325
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x12730
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x15075
1903A
Halloumi Boxes
brute force
,
greedy
,
sortings
800
x31225
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1514
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x3170
1899E
Queue Sort
greedy
,
implementation
,
sortings
1300
x15312
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2241
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x343
1896E
Permutation Sorting
data structures
,
sortings
2100
x2202
1896C
Matching Arrays
binary search
,
constructive algorithms
,
greedy
,
sortings
1400
x9510
1896A
Jagged Swaps
sortings
800
x23410
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1550
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