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Codeforces Round 945 (Div. 2)
2 days
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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
1971G
XOUR
data structures
,
dsu
,
sortings
1400
x5075
1971E
Find the Car
binary search
,
math
,
sortings
1500
x8159
1971D
Binary Cut
greedy
,
implementation
,
sortings
,
strings
1100
x17277
1971A
My First Sorting Problem
implementation
,
sortings
800
x30429
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x1937
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3234
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x8924
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x10044
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x260
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x7172
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x23853
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4906
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x692
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x9649
1949F
Dating
greedy
,
sortings
,
trees
2200
x763
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x1866
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x23578
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x3581
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2431
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5214
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x124
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x32
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x174
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1098
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7152
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x17855
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x35519
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x3409
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x13392
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x6419
1930A
Maximise The Score
greedy
,
sortings
800
x17183
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x28935
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x15321
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3813
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2281
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x19052
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x20025
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x19309
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3604
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x775
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1558
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x22158
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x5442
1915F
Greetings
data structures
,
divide and conquer
,
sortings
1500
x11659
1914E2
Game with Marbles (Hard Version)
games
,
greedy
,
sortings
1400
x11274
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x11173
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x18243
1912A
Accumulator Apex
data structures
,
implementation
,
sortings
1900
x1883
1909C
Heavy Intervals
constructive algorithms
,
data structures
,
dsu
,
greedy
,
math
,
sortings
1400
x9986
1907F
Shift and Reverse
greedy
,
sortings
1800
x4392
1906F
Maximize The Value
data structures
,
sortings
2100
x938
1904D2
Set To Max (Hard Version)
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
sortings
1800
x3826
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x10677
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x12875
1903A
Halloumi Boxes
brute force
,
greedy
,
sortings
800
x24328
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1373
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2914
1899E
Queue Sort
greedy
,
implementation
,
sortings
1300
x13944
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2057
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x308
1896E
Permutation Sorting
data structures
,
sortings
2100
x2021
1896C
Matching Arrays
binary search
,
constructive algorithms
,
greedy
,
sortings
1400
x8625
1896A
Jagged Swaps
sortings
800
x18833
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1456
1895B
Points and Minimum Distance
greedy
,
math
,
sortings
800
x19655
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x8093
1891E
Brukhovich and Exams
brute force
,
greedy
,
implementation
,
math
,
sortings
2500
x774
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x11340
1891B
Deja Vu
brute force
,
math
,
sortings
1100
x15843
1891A
Sorting with Twos
constructive algorithms
,
sortings
800
x18379
1889C1
Doremy's Drying Plan (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x3016
1889B
Doremy's Connecting Plan
constructive algorithms
,
greedy
,
math
,
sortings
1700
x6756
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1337
1884C
Medium Design
brute force
,
data structures
,
dp
,
greedy
,
sortings
1700
x5467
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x4886
1876C
Autosynthesis
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
sortings
2100
x2142
1876B
Effects of Anti Pimples
combinatorics
,
number theory
,
sortings
1500
x7536
1876A
Helmets in Night Light
greedy
,
sortings
1000
x14874
1873E
Building an Aquarium
binary search
,
sortings
1100
x23105
1870D
Prefix Purchase
greedy
,
implementation
,
sortings
1800
x6440
1869B
2D Traveling
geometry
,
math
,
shortest paths
,
sortings
1100
x14449
1867A
green_gold_dog, array and permutation
constructive algorithms
,
sortings
800
x19225
1866F
Freak Joker Process
binary search
,
data structures
,
sortings
3100
x120
1864F
Exotic Queries
data structures
,
implementation
,
sortings
2300
x1316
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2468
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x14766
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2617
1863B
Split Sort
greedy
,
math
,
sortings
1100
x14598
1862G
The Great Equalizer
binary search
,
data structures
,
math
,
sortings
2000
x2659
1862C
Flower City Fence
binary search
,
data structures
,
implementation
,
sortings
1100
x19675
1860F
Evaluate RBS
data structures
,
geometry
,
implementation
,
math
,
sortings
2900
x265
1859D
Andrey and Escape from Capygrad
binary search
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1800
x6562
1859B
Olya and Game with Arrays
constructive algorithms
,
greedy
,
math
,
sortings
1000
x24386
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x4095
1857E
Power of Points
math
,
sortings
1500
x11533
1857D
Strong Vertices
math
,
sortings
,
trees
1300
x17768
1857C
Assembly via Minimums
greedy
,
sortings
1200
x23031
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4148
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2937
1851E
Nastya and Potions
dfs and similar
,
dp
,
graphs
,
sortings
1500
x9467
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