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Before contest
Codeforces Round 964 (Div. 4)
17:54:34
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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
x22175
1950C
Clock Conversion
implementation
,
math
800
x37916
1950B
Upscaling
implementation
800
x36229
1950A
Stair, Peak, or Neither?
implementation
800
x48783
1949K
Make Triangle
constructive algorithms
,
math
2800
x276
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x358
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
1800
x1565
1949H
Division Avoidance
greedy
,
math
3100
x78
1949G
Scooter
graphs
,
greedy
2300
x698
1949F
Dating
greedy
,
sortings
,
trees
2200
x864
1949E
Damage per Second
brute force
,
math
2900
x92
1949D
Funny or Scary?
constructive algorithms
2600
x337
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1516
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x2718
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x98
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x666
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1245
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2843
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8886
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x15913
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x22053
1948A
Special Characters
brute force
,
constructive algorithms
800
x27737
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x872
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2322
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4436
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x10128
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x19542
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x25289
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x600
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x702
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x3958
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x7694
1945D
Seraphim the Owl
dp
,
greedy
1300
x13655
1945C
Left and Right Houses
brute force
1200
x14246
1945B
Fireworks
math
,
number theory
900
x21661
1945A
Setting up Camp
greedy
,
math
800
x26672
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x15574
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x22826
1943F
Minimum Hamming Distance
dp
3500
x100
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x275
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x408
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x678
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1369
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1969
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3620
1943A
MEX Game 1
games
,
greedy
1300
x16886
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x86
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x416
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x660
1942E
Farm Game
combinatorics
,
games
2300
x1587
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2657
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5906
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x10446
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x13380
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x16768
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x3300
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5642
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x9090
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x17778
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x31995
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x28544
1941A
Rudolf and the Ticket
brute force
,
math
800
x41130
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x127
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
x182
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x83
1939D
Big Persimmon
*special problem
,
dp
,
games
x86
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x286
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x214
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x21
1938M
Zig-zag
3500
x54
1938L
XOR Operations
2800
x282
1938K
Tree Quiz
2400
x589
1938J
There and Back Again
2100
x1211
1938I
Symmetric Boundary
2800
x66
1938H
Pho Restaurant
1600
x2028
1938G
Personality Test
2300
x958
1938F
Forming Groups
2400
x721
1938E
Duplicates
2200
x955
1938D
Bánh Bò
3300
x84
1938C
Bit Counting Sequence
1900
x1386
1938B
Attraction Score
3000
x184
1938A
Antiparticle Antiphysics
3500
x50
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x14265
1937A
Shuffle Party
implementation
,
math
800
x22595
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x76
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x105
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x469
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1225
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2683
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x7058
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x427
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1290
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x7859
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7793
1935B
Informatics in MAC
constructive algorithms
1200
x17765
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x27265
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x206
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1310
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3333
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