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Before contest
Codeforces Round 973 (Div. 2)
13:37:30
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→ Filter Problems
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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Custom test
Problems
#
Name
1949E
Damage per Second
brute force
,
math
2900
x98
1949D
Funny or Scary?
constructive algorithms
2600
x375
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1639
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x3015
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x101
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x675
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1276
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2908
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x9190
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x16408
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x22582
1948A
Special Characters
brute force
,
constructive algorithms
800
x28220
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x911
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2476
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4604
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x10604
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x20018
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x25721
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x628
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x733
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x4103
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x7912
1945D
Seraphim the Owl
dp
,
greedy
1300
x14112
1945C
Left and Right Houses
brute force
1200
x14617
1945B
Fireworks
math
,
number theory
900
x22164
1945A
Setting up Camp
greedy
,
math
800
x27163
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x15934
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x23360
1943F
Minimum Hamming Distance
dp
3500
x105
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x288
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x424
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x718
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1423
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x2040
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3756
1943A
MEX Game 1
games
,
greedy
1300
x17495
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x90
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x428
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x682
1942E
Farm Game
combinatorics
,
games
2300
x1627
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2728
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x6043
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x10736
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x13672
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x17050
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x3417
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5849
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x9457
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x18114
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x32801
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x29299
1941A
Rudolf and the Ticket
brute force
,
math
800
x41849
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
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x83
1939D
Big Persimmon
*special problem
,
dp
,
games
x87
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x302
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x234
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x21
1938M
Zig-zag
3500
x57
1938L
XOR Operations
2800
x288
1938K
Tree Quiz
2400
x615
1938J
There and Back Again
2100
x1259
1938I
Symmetric Boundary
2800
x74
1938H
Pho Restaurant
1600
x2101
1938G
Personality Test
2300
x1035
1938F
Forming Groups
2400
x738
1938E
Duplicates
2200
x987
1938D
Bánh Bò
3300
x90
1938C
Bit Counting Sequence
1900
x1435
1938B
Attraction Score
3000
x188
1938A
Antiparticle Antiphysics
3500
x51
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x14747
1937A
Shuffle Party
implementation
,
math
800
x22910
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x141
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x111
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x491
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1275
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2813
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x7277
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x438
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1333
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x8081
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x8025
1935B
Informatics in MAC
constructive algorithms
1200
x18211
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x27662
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x220
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1356
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3435
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6648
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x18523
1934A
Too Min Too Max
greedy
,
math
800
x25095
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x958
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2445
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x10999
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x19874
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x22329
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x32435
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x37732
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