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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
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8090
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x14213
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x20267
1948A
Special Characters
brute force
,
constructive algorithms
800
x26088
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x760
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2054
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x3951
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x8940
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x17661
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x23283
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x476
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x615
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x3518
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x6842
1945D
Seraphim the Owl
dp
,
greedy
1300
x11927
1945C
Left and Right Houses
brute force
1200
x12602
1945B
Fireworks
math
,
number theory
900
x19383
1945A
Setting up Camp
greedy
,
math
800
x24407
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x14096
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x20988
1943F
Minimum Hamming Distance
dp
3500
x75
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x215
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x342
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x575
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1221
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1760
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3216
1943A
MEX Game 1
games
,
greedy
1300
x15111
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x58
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x360
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x547
1942E
Farm Game
combinatorics
,
games
2300
x1417
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2386
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5412
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x9367
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x12101
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x15426
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x2906
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5121
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x8062
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x16443
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x29460
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x26219
1941A
Rudolf and the Ticket
brute force
,
math
800
x38663
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
x272
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x208
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
x527
1938J
There and Back Again
2100
x1103
1938I
Symmetric Boundary
2800
x52
1938H
Pho Restaurant
1600
x1847
1938G
Personality Test
2300
x861
1938F
Forming Groups
2400
x632
1938E
Duplicates
2200
x848
1938D
Bánh Bò
3300
x77
1938C
Bit Counting Sequence
1900
x1240
1938B
Attraction Score
3000
x146
1938A
Antiparticle Antiphysics
3500
x37
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x12964
1937A
Shuffle Party
implementation
,
math
800
x21331
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
x1066
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2400
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6508
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x389
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1158
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x7260
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7063
1935B
Informatics in MAC
constructive algorithms
1200
x16298
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x25314
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x182
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1177
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3045
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6002
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x16504
1934A
Too Min Too Max
greedy
,
math
800
x23234
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x856
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2185
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x9619
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x17627
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x20344
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x29733
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x35232
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x868
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x3354
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x6721
1932D
Card Game
greedy
,
implementation
1400
x9810
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x13539
1932B
Chaya Calendar
number theory
1100
x18258
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x26488
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2425
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