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Before contest
Codeforces Round 937 (Div. 4)
01:26:19
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Difficulty:
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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
1949K
Make Triangle
constructive algorithms
,
math
x111
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
x193
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
x802
1949H
Division Avoidance
greedy
,
math
x38
1949G
Scooter
graphs
,
greedy
x402
1949F
Dating
greedy
,
sortings
,
trees
x489
1949E
Damage per Second
brute force
,
math
x47
1949D
Funny or Scary?
constructive algorithms
x199
1949C
Annual Ants' Gathering
dfs and similar
,
greedy
,
trees
x796
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
x1204
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
x47
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x470
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x877
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2164
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x6901
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x12367
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x17820
1948A
Special Characters
brute force
,
constructive algorithms
800
x23081
1946F
Nobody is needed
brute force
,
data structures
,
dp
,
math
2500
x511
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x1542
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x3032
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x7103
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x14769
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x19731
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x360
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x479
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x2858
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x5672
1945D
Seraphim the Owl
dp
,
greedy
1300
x10081
1945C
Left and Right Houses
brute force
1200
x10729
1945B
Fireworks
math
,
number theory
900
x16547
1945A
Setting up Camp
greedy
,
math
800
x20800
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x12634
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x18619
1943F
Minimum Hamming Distance
dp
3500
x38
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x146
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x256
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x418
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x979
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1459
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x2691
1943A
MEX Game 1
games
,
greedy
1300
x13238
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x2541
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x4622
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x7274
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x15377
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x27573
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x24347
1941A
Rudolf and the Ticket
brute force
,
math
800
x36481
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
x24
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x159
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x72
1939D
Big Persimmon
*special problem
,
dp
,
games
x49
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x249
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x193
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x12
1938M
Zig-zag
3500
x41
1938L
XOR Operations
2800
x217
1938K
Tree Quiz
2400
x482
1938J
There and Back Again
2100
x1014
1938I
Symmetric Boundary
2800
x44
1938H
Pho Restaurant
1600
x1689
1938G
Personality Test
2300
x788
1938F
Forming Groups
2400
x582
1938E
Duplicates
2200
x782
1938D
Bánh Bò
3300
x66
1938C
Bit Counting Sequence
1900
x1126
1938B
Attraction Score
3000
x136
1938A
Antiparticle Antiphysics
3500
x34
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x12146
1937A
Shuffle Party
implementation
,
math
800
x20265
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x54
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x76
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x355
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x942
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2168
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6109
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x311
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1011
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x6707
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x6506
1935B
Informatics in MAC
constructive algorithms
1200
x15375
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x24158
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x145
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1082
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x2820
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x5640
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x15527
1934A
Too Min Too Max
greedy
,
math
800
x22109
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x798
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2009
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x8929
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x16708
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x19446
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x28573
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x33965
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x791
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x2986
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x6137
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