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Problems
#
Name
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3368
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x7373
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x11616
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x19847
1950C
Clock Conversion
implementation
,
math
800
x34321
1950B
Upscaling
implementation
800
x32726
1950A
Stair, Peak, or Neither?
implementation
800
x42860
1949K
Make Triangle
constructive algorithms
,
math
2800
x223
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x307
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
1800
x1079
1949H
Division Avoidance
greedy
,
math
3100
x68
1949G
Scooter
graphs
,
greedy
2300
x618
1949F
Dating
greedy
,
sortings
,
trees
2200
x711
1949E
Damage per Second
brute force
,
math
2900
x78
1949D
Funny or Scary?
constructive algorithms
2600
x297
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1109
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x1600
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x80
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x593
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1113
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2579
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8095
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x14220
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x20276
1948A
Special Characters
brute force
,
constructive algorithms
800
x26098
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x760
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2055
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x3955
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x8947
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x17672
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x23291
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
x3520
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x6845
1945D
Seraphim the Owl
dp
,
greedy
1300
x11933
1945C
Left and Right Houses
brute force
1200
x12606
1945B
Fireworks
math
,
number theory
900
x19394
1945A
Setting up Camp
greedy
,
math
800
x24420
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x14101
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x20992
1943F
Minimum Hamming Distance
dp
3500
x75
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x219
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x348
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x582
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1230
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1774
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3228
1943A
MEX Game 1
games
,
greedy
1300
x15118
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x59
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x363
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x547
1942E
Farm Game
combinatorics
,
games
2300
x1419
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2388
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5414
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x9372
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x12108
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x15432
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x2907
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5122
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x8066
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x16452
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x29470
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x26228
1941A
Rudolf and the Ticket
brute force
,
math
800
x38673
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
x1104
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
x1241
1938B
Attraction Score
3000
x146
1938A
Antiparticle Antiphysics
3500
x37
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x12969
1937A
Shuffle Party
implementation
,
math
800
x21338
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
x1068
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2403
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6512
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
x1160
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x7265
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7066
1935B
Informatics in MAC
constructive algorithms
1200
x16305
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x25317
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divide and conquer
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