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Name
1986G2
Permutation Problem (Hard Version)
brute force
,
data structures
,
hashing
,
math
,
number theory
x431
1986G1
Permutation Problem (Simple Version)
binary search
,
brute force
,
combinatorics
,
data structures
,
math
,
number theory
x727
1986F
Non-academic Problem
dfs and similar
,
graphs
x2568
1986E
Beautiful Array
greedy
,
math
,
sortings
x5755
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
x10600
1986C
Update Queries
data structures
,
greedy
,
sortings
x17927
1986B
Matrix Stabilization
brute force
,
data structures
,
greedy
,
sortings
x20690
1986A
X Axis
brute force
,
geometry
,
math
,
sortings
x30330
1985H2
Maximize the Largest Component (Hard Version)
data structures
,
dfs and similar
,
dp
,
dsu
,
implementation
2200
x1031
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
1700
x3910
1985G
D-Function
combinatorics
,
math
,
number theory
1600
x6628
1985F
Final Boss
binary search
,
data structures
1500
x11060
1985E
Secret Box
brute force
,
combinatorics
,
math
1200
x15685
1985D
Manhattan Circle
implementation
,
math
900
x27841
1985C
Good Prefixes
greedy
1000
x25078
1985B
Maximum Multiple Sum
brute force
,
math
,
number theory
800
x36366
1985A
Creating Words
implementation
,
strings
800
x40340
1984H
Tower Capturing
combinatorics
,
dp
,
geometry
3300
x116
1984G
Magic Trick II
constructive algorithms
,
implementation
,
sortings
3200
x148
1984F
Reconstruction
brute force
,
dp
,
math
2500
x689
1984E
Shuffle
dp
,
greedy
,
trees
2400
x1055
1984D
''a'' String Problem
brute force
,
hashing
,
implementation
,
math
,
string suffix structures
,
strings
2000
x2572
1984C2
Magnitude (Hard Version)
combinatorics
,
dp
,
greedy
,
math
1700
x5866
1984C1
Magnitude (Easy Version)
dp
,
greedy
,
math
1300
x12931
1984B
Large Addition
implementation
,
math
1100
x14983
1984A
Strange Splitting
constructive algorithms
800
x17973
1982F
Sorting Problem Again
binary search
,
data structures
x244
1982E
Number of k-good subarrays
bitmasks
,
combinatorics
,
divide and conquer
,
divide and conquer
,
dp
,
math
,
meet-in-the-middle
x516
1982D
Beauty of the mountains
brute force
,
data structures
,
implementation
,
math
,
number theory
x3160
1982C
Boring Day
binary search
,
data structures
,
dp
,
greedy
,
two pointers
x10043
1982B
Collatz Conjecture
brute force
,
implementation
,
math
,
number theory
x10226
1982A
Soccer
greedy
,
implementation
,
math
,
sortings
x17518
1981F
Turtle and Paths on a Tree
data structures
,
dp
,
trees
3000
x181
1981E
Turtle and Intersected Segments
data structures
,
dsu
,
graphs
,
greedy
2600
x586
1981D
Turtle and Multiplication
constructive algorithms
,
dfs and similar
,
graphs
,
number theory
2400
x1180
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x4088
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
1300
x11280
1981A
Turtle and Piggy Are Playing a Game
brute force
,
greedy
,
math
800
x19271
1980G
Yasya and the Mysterious Tree
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
strings
,
trees
2300
x890
1980F2
Field Division (hard version)
math
,
sortings
2400
x740
1980F1
Field Division (easy version)
data structures
,
math
,
sortings
1900
x3003
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x8434
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x11761
1980C
Sofia and the Lost Operations
constructive algorithms
,
greedy
1300
x15799
1980B
Choosing Cubes
sortings
,
sortings
800
x30565
1980A
Problem Generator
math
800
x35424
1979F
Kostyanych's Theorem
brute force
,
constructive algorithms
,
graphs
,
interactive
2900
x208
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x1055
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x5291
1979C
Earning on Bets
binary search
,
combinatorics
,
constructive algorithms
,
number theory
1200
x15765
1979B
XOR Sequences
bitmasks
,
greedy
1000
x19537
1979A
Guess the Maximum
brute force
,
greedy
,
implementation
800
x25604
1978F
Large Graph
data structures
,
dfs and similar
,
dsu
,
graphs
,
number theory
,
two pointers
2400
x862
1978E
Computing Machine
brute force
,
data structures
,
dp
,
greedy
,
implementation
2000
x2622
1978D
Elections
data structures
,
greedy
,
implementation
,
math
1600
x8165
1978C
Manhattan Permutations
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1300
x11340
1978B
New Bakery
binary search
,
greedy
,
math
,
ternary search
800
x18120
1978A
Alice and Books
constructive algorithms
,
greedy
,
sortings
800
x20611
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
2600
x512
1977D
XORificator
bitmasks
,
brute force
,
greedy
,
hashing
2300
x1453
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x5591
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x15551
1977A
Little Nikita
math
800
x27004
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
2800
x402
1976E
Splittable Permutations
combinatorics
,
data structures
,
dfs and similar
,
greedy
,
math
,
trees
2500
x765
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x3329
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x8494
1976B
Increase/Decrease/Copy
greedy
,
implementation
1100
x19183
1976A
Verify Password
implementation
,
sortings
,
strings
800
x24749
1975I
Mind Bloom
dp
3500
x48
1975H
378QAQ and Core
greedy
,
strings
3500
x69
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
3000
x186
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x648
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x1836
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x4875
1975C
Chamo and Mocha's Array
binary search
,
brute force
,
greedy
1200
x12308
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
1000
x15183
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x16771
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
2000
x3547
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3021
1974E
Money Buys Happiness
dp
1800
x6562
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x12701
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x13647
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x27606
1974A
Phone Desktop
greedy
,
math
800
x30129
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x172
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
2500
x670
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1659
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x7164
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x12245
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x21501
1972B
Coin Games
games
900
x18908
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x20778
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1409
1971G
XOUR
data structures
,
dsu
,
sortings
1700
x7905
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x8439
1971E
Find the Car
binary search
,
math
,
sortings
1500
x11976
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x22702
1971C
Clock and Strings
implementation
900
x28421
1971B
Different String
implementation
,
strings
800
x32213
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dfs and similar
divide and conquer
dp
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greedy
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sortings
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strings
ternary search
trees
two pointers
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