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Problems
#
Name
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3456
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x7540
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x11900
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x20218
1950C
Clock Conversion
implementation
,
math
800
x34932
1950B
Upscaling
implementation
800
x33369
1950A
Stair, Peak, or Neither?
implementation
800
x43748
1949K
Make Triangle
constructive algorithms
,
math
2800
x227
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x308
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
1800
x1128
1949H
Division Avoidance
greedy
,
math
3100
x69
1949G
Scooter
graphs
,
greedy
2300
x629
1949F
Dating
greedy
,
sortings
,
trees
2200
x737
1949E
Damage per Second
brute force
,
math
2900
x79
1949D
Funny or Scary?
constructive algorithms
2600
x300
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1165
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x1767
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x80
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x608
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1140
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2618
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8174
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x14391
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x20436
1948A
Special Characters
brute force
,
constructive algorithms
800
x26239
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x770
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2087
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4003
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x9056
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x17822
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x23452
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x488
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x624
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x3558
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x6905
1945D
Seraphim the Owl
dp
,
greedy
1300
x12100
1945C
Left and Right Houses
brute force
1200
x12786
1945B
Fireworks
math
,
number theory
900
x19610
1945A
Setting up Camp
greedy
,
math
800
x24628
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x14222
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x21146
1943F
Minimum Hamming Distance
dp
3500
x79
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x230
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x361
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x594
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1248
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1794
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3280
1943A
MEX Game 1
games
,
greedy
1300
x15266
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x59
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x366
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x556
1942E
Farm Game
combinatorics
,
games
2300
x1435
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2411
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5456
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x9466
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x12207
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x15521
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x2948
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5181
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x8143
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x16581
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x29650
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x26384
1941A
Rudolf and the Ticket
brute force
,
math
800
x38857
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
x79
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
x247
1938K
Tree Quiz
2400
x531
1938J
There and Back Again
2100
x1111
1938I
Symmetric Boundary
2800
x52
1938H
Pho Restaurant
1600
x1864
1938G
Personality Test
2300
x870
1938F
Forming Groups
2400
x639
1938E
Duplicates
2200
x858
1938D
Bánh Bò
3300
x77
1938C
Bit Counting Sequence
1900
x1252
1938B
Attraction Score
3000
x146
1938A
Antiparticle Antiphysics
3500
x37
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x13065
1937A
Shuffle Party
implementation
,
math
800
x21421
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x66
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x96
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x413
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1086
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2439
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6554
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
x1167
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x7309
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7115
1935B
Informatics in MAC
constructive algorithms
1200
x16398
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x25410
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combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
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combinatorics
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data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
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ternary search
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