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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
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ternary search
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Problems
#
Name
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3427
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x7473
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x11767
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x20034
1950C
Clock Conversion
implementation
,
math
800
x34640
1950B
Upscaling
implementation
800
x33076
1950A
Stair, Peak, or Neither?
implementation
800
x43330
1949K
Make Triangle
constructive algorithms
,
math
2800
x224
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x307
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
1800
x1109
1949H
Division Avoidance
greedy
,
math
3100
x69
1949G
Scooter
graphs
,
greedy
2300
x625
1949F
Dating
greedy
,
sortings
,
trees
2200
x722
1949E
Damage per Second
brute force
,
math
2900
x79
1949D
Funny or Scary?
constructive algorithms
2600
x299
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1142
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x1702
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x80
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x600
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1129
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2603
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8142
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x14331
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x20379
1948A
Special Characters
brute force
,
constructive algorithms
800
x26187
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x766
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2068
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x3984
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x9011
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x17756
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x23380
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x483
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x622
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x3546
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x6883
1945D
Seraphim the Owl
dp
,
greedy
1300
x12032
1945C
Left and Right Houses
brute force
1200
x12716
1945B
Fireworks
math
,
number theory
900
x19516
1945A
Setting up Camp
greedy
,
math
800
x24540
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x14158
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x21077
1943F
Minimum Hamming Distance
dp
3500
x77
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x226
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x356
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x589
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1243
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1786
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3257
1943A
MEX Game 1
games
,
greedy
1300
x15200
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x59
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x364
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x553
1942E
Farm Game
combinatorics
,
games
2300
x1429
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2399
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5439
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x9428
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x12160
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x15487
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x2932
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5160
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x8113
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x16514
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x29575
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x26321
1941A
Rudolf and the Ticket
brute force
,
math
800
x38786
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x123
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x32
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x173
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x78
1939D
Big Persimmon
*special problem
,
dp
,
games
x59
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x273
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x209
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x14
1938M
Zig-zag
3500
x45
1938L
XOR Operations
2800
x246
1938K
Tree Quiz
2400
x530
1938J
There and Back Again
2100
x1110
1938I
Symmetric Boundary
2800
x52
1938H
Pho Restaurant
1600
x1856
1938G
Personality Test
2300
x866
1938F
Forming Groups
2400
x637
1938E
Duplicates
2200
x855
1938D
Bánh Bò
3300
x77
1938C
Bit Counting Sequence
1900
x1248
1938B
Attraction Score
3000
x146
1938A
Antiparticle Antiphysics
3500
x37
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x13023
1937A
Shuffle Party
implementation
,
math
800
x21385
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x66
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x94
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x409
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1078
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2422
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6536
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x391
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1164
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x7291
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7093
1935B
Informatics in MAC
constructive algorithms
1200
x16357
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x25372
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