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Codeforces Round 937 (Div. 4)
05:51:43
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Difficulty:
—
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
1949F
Dating
greedy
,
sortings
,
trees
x484
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
x1189
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x19630
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x2845
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x4613
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x109
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x23
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x158
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x940
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x6494
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x16693
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x33951
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x2982
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x12547
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x6085
1930A
Maximise The Score
greedy
,
sortings
800
x16342
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x27936
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x14514
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3527
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2173
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x18483
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19433
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x18773
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3502
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x710
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1417
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x21503
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x5164
1915F
Greetings
data structures
,
divide and conquer
,
sortings
1500
x10994
1914E2
Game with Marbles (Hard Version)
games
,
greedy
,
sortings
1400
x10848
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x10775
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x17156
1912A
Accumulator Apex
data structures
,
implementation
,
sortings
1900
x1705
1909C
Heavy Intervals
constructive algorithms
,
data structures
,
dsu
,
greedy
,
math
,
sortings
1400
x9597
1907F
Shift and Reverse
greedy
,
sortings
1800
x4215
1906F
Maximize The Value
data structures
,
sortings
2100
x874
1904D2
Set To Max (Hard Version)
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
sortings
1800
x3611
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x9969
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x12174
1903A
Halloumi Boxes
brute force
,
greedy
,
sortings
800
x21957
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1313
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2791
1899E
Queue Sort
greedy
,
implementation
,
sortings
1300
x13462
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x1982
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x221
1896E
Permutation Sorting
data structures
,
sortings
2100
x1932
1896C
Matching Arrays
binary search
,
constructive algorithms
,
greedy
,
sortings
1400
x8282
1896A
Jagged Swaps
sortings
800
x16905
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1420
1895B
Points and Minimum Distance
greedy
,
math
,
sortings
800
x19389
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x7844
1891E
Brukhovich and Exams
brute force
,
greedy
,
implementation
,
math
,
sortings
2500
x761
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x10789
1891B
Deja Vu
brute force
,
math
,
sortings
1100
x15158
1891A
Sorting with Twos
constructive algorithms
,
sortings
800
x18139
1889C1
Doremy's Drying Plan (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x2909
1889B
Doremy's Connecting Plan
constructive algorithms
,
greedy
,
math
,
sortings
1700
x6539
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1290
1884C
Medium Design
brute force
,
data structures
,
dp
,
greedy
,
sortings
1700
x5235
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x4724
1876C
Autosynthesis
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
sortings
2100
x2082
1876B
Effects of Anti Pimples
combinatorics
,
number theory
,
sortings
1500
x7258
1876A
Helmets in Night Light
greedy
,
sortings
1000
x14004
1873E
Building an Aquarium
binary search
,
sortings
1100
x22036
1870D
Prefix Purchase
greedy
,
implementation
,
sortings
1800
x6251
1869B
2D Traveling
geometry
,
math
,
shortest paths
,
sortings
1100
x13926
1867A
green_gold_dog, array and permutation
constructive algorithms
,
sortings
800
x19024
1866F
Freak Joker Process
binary search
,
data structures
,
sortings
3100
x109
1864F
Exotic Queries
data structures
,
implementation
,
sortings
2300
x1287
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2436
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x14617
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2560
1863B
Split Sort
greedy
,
math
,
sortings
1100
x14374
1862G
The Great Equalizer
binary search
,
data structures
,
math
,
sortings
2000
x2568
1862C
Flower City Fence
binary search
,
data structures
,
implementation
,
sortings
1100
x19324
1860F
Evaluate RBS
data structures
,
geometry
,
implementation
,
math
,
sortings
2900
x260
1859D
Andrey and Escape from Capygrad
binary search
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1800
x6403
1859B
Olya and Game with Arrays
constructive algorithms
,
greedy
,
math
,
sortings
1000
x23513
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x3965
1857E
Power of Points
math
,
sortings
1500
x11262
1857D
Strong Vertices
math
,
sortings
,
trees
1300
x17258
1857C
Assembly via Minimums
greedy
,
sortings
1200
x22119
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4033
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2826
1851E
Nastya and Potions
dfs and similar
,
dp
,
graphs
,
sortings
1500
x9179
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x27553
1850G
The Morning Star
combinatorics
,
data structures
,
geometry
,
implementation
,
math
,
sortings
1500
x10917
1850D
Balanced Round
brute force
,
greedy
,
implementation
,
sortings
900
x30969
1850B
Ten Words of Wisdom
implementation
,
sortings
800
x39341
1850A
To My Critics
implementation
,
sortings
800
x49161
1849B
Monsters
greedy
,
math
,
sortings
1000
x21793
1848B
Vika and the Bridge
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1200
x12940
1847F
The Boss's Identity
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
math
,
sortings
2500
x841
1847A
The Man who became a God
greedy
,
sortings
800
x21463
1846C
Rudolf and the Another Competition
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1200
x17623
1844F2
Min Cost Permutation (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
,
sortings
2800
x362
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x32494
1842F
Tenzing and Tree
dfs and similar
,
greedy
,
shortest paths
,
sortings
,
trees
2500
x1212
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x461
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4033
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