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Codeforces Round 987 (Div. 2)
13:38:36
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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
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x23269
1950C
Clock Conversion
implementation
,
math
800
x40098
1950B
Upscaling
implementation
800
x38208
1950A
Stair, Peak, or Neither?
implementation
800
x53400
1949K
Make Triangle
constructive algorithms
,
math
2800
x327
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x396
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
1800
x1871
1949H
Division Avoidance
greedy
,
math
3100
x127
1949G
Scooter
graphs
,
greedy
2300
x781
1949F
Dating
greedy
,
sortings
,
trees
2200
x986
1949E
Damage per Second
brute force
,
math
2900
x103
1949D
Funny or Scary?
constructive algorithms
2600
x406
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1775
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x3313
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x113
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x699
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1330
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x3009
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x9502
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x16970
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x23030
1948A
Special Characters
brute force
,
constructive algorithms
800
x28600
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x977
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2573
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4757
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x11025
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x20515
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x26119
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x675
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x747
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x4256
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x8237
1945D
Seraphim the Owl
dp
,
greedy
1300
x14550
1945C
Left and Right Houses
brute force
1200
x15005
1945B
Fireworks
math
,
number theory
900
x22794
1945A
Setting up Camp
greedy
,
math
800
x27742
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x16261
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x23847
1943F
Minimum Hamming Distance
dp
3500
x112
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x304
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x441
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x797
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1501
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x2130
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3881
1943A
MEX Game 1
games
,
greedy
1300
x18069
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x96
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x452
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x701
1942E
Farm Game
combinatorics
,
games
2300
x1693
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2814
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x6185
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x11009
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x13994
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x17272
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x3565
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x6086
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x9760
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x18446
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x33520
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x29972
1941A
Rudolf and the Ticket
brute force
,
math
800
x42603
1938M
Zig-zag
3500
x60
1938L
XOR Operations
2800
x294
1938K
Tree Quiz
2400
x633
1938J
There and Back Again
2100
x1292
1938I
Symmetric Boundary
2800
x76
1938H
Pho Restaurant
1600
x2164
1938G
Personality Test
2300
x1056
1938F
Forming Groups
2400
x759
1938E
Duplicates
2200
x1016
1938D
Bánh Bò
3300
x91
1938C
Bit Counting Sequence
1900
x1476
1938B
Attraction Score
3000
x199
1938A
Antiparticle Antiphysics
3500
x56
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x15117
1937A
Shuffle Party
implementation
,
math
800
x23203
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x144
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x125
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x513
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1334
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2945
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x7503
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x452
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1375
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x8299
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x8242
1935B
Informatics in MAC
constructive algorithms
1200
x18656
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x28033
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x240
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1391
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3543
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6845
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x19054
1934A
Too Min Too Max
greedy
,
math
800
x25501
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x984
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2507
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x11312
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x20394
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x22737
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