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math
combine-tags-by-or
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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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Status
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Custom test
Problems
#
Name
1994H
Fortnite
combinatorics
,
constructive algorithms
,
games
,
greedy
,
hashing
,
interactive
,
math
,
number theory
,
strings
x75
1994G
Minecraft
bitmasks
,
brute force
,
dp
,
math
x513
1994E
Wooden Game
bitmasks
,
greedy
,
math
,
sortings
,
trees
x2692
1994D
Funny Game
constructive algorithms
,
dsu
,
graphs
,
greedy
,
math
,
number theory
,
trees
x3587
1994B
Fun Game
bitmasks
,
constructive algorithms
,
greedy
,
math
x12767
1992G
Ultra-Meow
combinatorics
,
dp
,
math
2000
x2073
1992E
Novice's Mistake
brute force
,
constructive algorithms
,
implementation
,
math
,
strings
1700
x7244
1992C
Gorilla and Permutation
constructive algorithms
,
math
900
x24251
1992B
Angry Monk
greedy
,
math
,
sortings
800
x28320
1992A
Only Pluses
brute force
,
constructive algorithms
,
greedy
,
math
,
sortings
800
x33230
1990D
Grid Puzzle
bitmasks
,
dp
,
greedy
,
math
x2942
1990C
Mad MAD Sum
brute force
,
greedy
,
math
x5867
1989E
Distance to Different
combinatorics
,
dp
,
math
2300
x1503
1989D
Smithing Skill
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
,
two pointers
1900
x4828
1989C
Two Movies
greedy
,
math
1400
x15146
1988F
Heartbeat
combinatorics
,
dp
,
fft
,
math
3000
x83
1988A
Split the Multiset
brute force
,
greedy
,
implementation
,
math
900
x18738
1987A
Upload More RAM
greedy
,
math
800
x22006
1986G2
Permutation Problem (Hard Version)
brute force
,
data structures
,
hashing
,
math
,
number theory
2500
x839
1986G1
Permutation Problem (Simple Version)
binary search
,
brute force
,
combinatorics
,
data structures
,
math
,
number theory
2200
x1192
1986E
Beautiful Array
greedy
,
math
,
number theory
,
sortings
1700
x7329
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x13185
1986A
X Axis
brute force
,
geometry
,
math
,
sortings
800
x35738
1985G
D-Function
combinatorics
,
math
,
number theory
1600
x7785
1985E
Secret Box
brute force
,
combinatorics
,
math
1200
x17514
1985D
Manhattan Circle
implementation
,
math
900
x30529
1985B
Maximum Multiple Sum
brute force
,
math
,
number theory
800
x40016
1984F
Reconstruction
brute force
,
dp
,
math
2500
x797
1984D
''a'' String Problem
brute force
,
hashing
,
implementation
,
math
,
string suffix structures
,
strings
2000
x2827
1984C2
Magnitude (Hard Version)
combinatorics
,
dp
,
greedy
,
math
1700
x6449
1984C1
Magnitude (Easy Version)
dp
,
greedy
,
math
1300
x14437
1984B
Large Addition
implementation
,
math
1100
x16494
1983E
I Love Balls
combinatorics
,
math
,
probabilities
2300
x1649
1983D
Swap Dilemma
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
math
,
sortings
1700
x6884
1983B
Corner Twist
constructive algorithms
,
greedy
,
implementation
,
math
1200
x14157
1983A
Array Divisibility
constructive algorithms
,
math
800
x23095
1982E
Number of k-good subarrays
bitmasks
,
brute force
,
combinatorics
,
divide and conquer
,
dp
,
math
,
meet-in-the-middle
2300
x1330
1982D
Beauty of the mountains
brute force
,
data structures
,
implementation
,
math
,
number theory
1700
x6082
1982B
Collatz Conjecture
brute force
,
implementation
,
math
,
number theory
1200
x14974
1982A
Soccer
greedy
,
implementation
,
math
,
sortings
800
x22723
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x4546
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
1300
x12245
1981A
Turtle and Piggy Are Playing a Game
brute force
,
greedy
,
math
800
x20560
1980F2
Field Division (hard version)
math
,
sortings
2400
x850
1980F1
Field Division (easy version)
data structures
,
math
,
sortings
1900
x3306
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x9168
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x12760
1980A
Problem Generator
math
800
x37150
1978D
Elections
data structures
,
greedy
,
implementation
,
math
1600
x9629
1978C
Manhattan Permutations
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1300
x13074
1978B
New Bakery
binary search
,
greedy
,
math
,
ternary search
800
x20309
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x5970
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x16350
1977A
Little Nikita
math
800
x28467
1976E
Splittable Permutations
combinatorics
,
data structures
,
dfs and similar
,
greedy
,
math
,
trees
2500
x869
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
3000
x200
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x717
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
1000
x16199
1974A
Phone Desktop
greedy
,
math
800
x31168
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
2500
x711
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1727
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x7531
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x12803
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x22508
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x8848
1971E
Find the Car
binary search
,
math
,
sortings
1500
x12626
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x4056
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x18727
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1724
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x13719
1968A
Maximize?
brute force
,
math
,
number theory
800
x31365
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x85
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x172
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1514
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3582
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x12051
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x11284
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x12315
1958B
Clock in the Pool
*special problem
,
math
1400
x768
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1137
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x4131
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x8799
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x770
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1358
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3591
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x12014
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x4075
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x6546
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x19776
1955A
Yogurt Sale
math
800
x40243
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x235
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x2025
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x5552
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x18007
1954B
Make It Ugly
implementation
,
math
1200
x17293
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x22570
1952G
Mathematician Takeover
binary search
,
dfs and similar
,
math
x985
1952E
Sweep Line
combinatorics
,
games
,
math
x227
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x305
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3346
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