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Rayan
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Rayan Programming Contest 2024 - Selection (Codeforces Round 989, Div. 1 + Div. 2)
3 days
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Difficulty:
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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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Custom test
Problems
#
Name
1000F
One Occurrence
data structures
,
divide and conquer
2400
x3941
1000E
We Need More Bosses
dfs and similar
,
graphs
,
trees
2100
x4768
1000D
Yet Another Problem On a Subsequence
combinatorics
,
dp
1900
x4260
1000C
Covered Points Count
data structures
,
implementation
,
sortings
1700
x6842
1000B
Light It Up
greedy
1500
x5890
1000A
Codehorses T-shirts
greedy
,
implementation
1200
x8838
999F
Cards and Joy
dp
2000
x2713
999E
Reachability from the Capital
dfs and similar
,
graphs
,
greedy
2000
x6736
999D
Equalize the Remainders
data structures
,
greedy
,
implementation
1900
x4403
999C
Alphabetic Removals
implementation
1200
x18513
999B
Reversing Encryption
implementation
900
x17696
999A
Mishka and Contest
brute force
,
implementation
800
x23198
998B
Cutting
dp
,
greedy
,
sortings
1200
x13207
998A
Balloons
constructive algorithms
,
implementation
1000
x9644
997E
Good Subsegments
data structures
3000
x1306
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x462
997C
Sky Full of Stars
combinatorics
,
math
2500
x1739
997B
Roman Digits
brute force
,
combinatorics
,
dp
,
greedy
,
math
2000
x2986
997A
Convert to Ones
brute force
,
greedy
,
implementation
,
math
1500
x8339
996B
World Cup
binary search
,
math
1300
x9074
996A
Hit the Lottery
dp
,
greedy
800
x92968
995F
Cowmpany Cowmpensation
combinatorics
,
dp
,
math
,
trees
2700
x1269
995E
Number Clicker
divide and conquer
,
graphs
,
meet-in-the-middle
,
number theory
2700
x692
995D
Game
math
2500
x769
995C
Leaving the Bar
brute force
,
data structures
,
geometry
,
greedy
,
math
,
sortings
2300
x1910
995B
Suit and Tie
greedy
,
implementation
,
math
1400
x7112
995A
Tesla
constructive algorithms
,
implementation
2100
x1702
994B
Knights of a Polygonal Table
greedy
,
implementation
,
sortings
1400
x5739
994A
Fingerprints
implementation
800
x14227
993F
The Moral Dilemma
3200
x60
993E
Nikita and Order Statistics
chinese remainder theorem
,
fft
,
math
2300
x1440
993D
Compute Power
binary search
,
dp
,
greedy
2500
x754
993C
Careful Maneuvering
bitmasks
,
brute force
,
geometry
2100
x1705
993B
Open Communication
bitmasks
,
brute force
1900
x1956
993A
Two Squares
geometry
,
implementation
1600
x4162
992E
Nastya and King-Shamans
binary search
,
data structures
2500
x1459
992D
Nastya and a Game
brute force
,
implementation
,
math
2100
x1658
992C
Nastya and a Wardrobe
math
1600
x4621
992B
Nastya Studies Informatics
math
,
number theory
1600
x6298
992A
Nastya and an Array
implementation
,
sortings
800
x13219
991F
Concise and clear
brute force
,
greedy
,
implementation
,
math
2700
x310
991E
Bus Number
brute force
,
combinatorics
,
math
1800
x3514
991D
Bishwock
dp
,
greedy
1500
x7231
991C
Candies
binary search
,
implementation
1500
x10542
991B
Getting an A
greedy
,
sortings
900
x12675
991A
If at first you don't succeed...
implementation
1000
x10650
990G
GCD Counting
divide and conquer
,
dp
,
dsu
,
number theory
,
trees
2400
x1887
990F
Flow Control
dfs and similar
,
dp
,
greedy
,
trees
2400
x912
990E
Post Lamps
brute force
,
greedy
2100
x2034
990D
Graph And Its Complement
constructive algorithms
,
graphs
,
implementation
1700
x3852
990C
Bracket Sequences Concatenation Problem
implementation
1500
x5940
990B
Micro-World
greedy
,
sortings
1200
x8163
990A
Commentary Boxes
implementation
,
math
1000
x10633
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x253
989D
A Shade of Moonlight
binary search
,
geometry
,
math
,
sortings
,
two pointers
2500
x517
989C
A Mist of Florescence
constructive algorithms
,
graphs
1800
x3822
989B
A Tide of Riverscape
constructive algorithms
,
strings
1200
x7067
989A
A Blend of Springtime
implementation
,
strings
900
x10392
988F
Rain and Umbrellas
dp
2100
x2338
988E
Divisibility by 25
brute force
,
greedy
2100
x3995
988D
Points and Powers of Two
brute force
,
math
1800
x7352
988C
Equal Sums
implementation
,
sortings
1400
x10279
988B
Substrings Sort
sortings
,
strings
1100
x18606
988A
Diverse Team
brute force
,
implementation
800
x25296
987C
Three displays
brute force
,
dp
,
implementation
1400
x13625
987B
High School: Become Human
math
1100
x11657
987A
Infinity Gauntlet
implementation
800
x16675
986F
Oppa Funcan Style Remastered
graphs
,
math
,
number theory
,
shortest paths
3300
x642
986E
Prince's Problem
brute force
,
data structures
,
math
,
number theory
,
trees
2800
x799
986D
Perfect Encoding
fft
,
math
3100
x332
986C
AND Graph
bitmasks
,
dfs and similar
,
dsu
,
graphs
2500
x2471
986B
Petr and Permutations
combinatorics
,
math
1800
x4692
986A
Fair
graphs
,
greedy
,
number theory
,
shortest paths
1600
x7028
985G
Team Players
combinatorics
2700
x527
985F
Isomorphic Strings
hashing
,
strings
2300
x1869
985E
Pencils and Boxes
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2100
x3696
985D
Sand Fortress
binary search
,
constructive algorithms
,
math
2100
x2570
985C
Liebig's Barrels
greedy
1500
x5788
985B
Switches and Lamps
implementation
1200
x7413
985A
Chess Placing
implementation
1100
x8175
984B
Minesweeper
implementation
1100
x7394
984A
Game
sortings
800
x19563
983E
NN country
binary search
,
data structures
,
trees
2800
x963
983D
Arkady and Rectangles
data structures
3300
x403
983C
Elevator
dp
,
graphs
,
shortest paths
2400
x842
983B
XOR-pyramid
dp
1800
x5574
983A
Finite or not?
implementation
,
math
1700
x4559
982F
The Meeting Place Cannot Be Changed
dfs and similar
,
graphs
2700
x195
982E
Billiard
geometry
,
number theory
2600
x721
982D
Shark
brute force
,
data structures
,
dsu
,
trees
1900
x2341
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x11717
982B
Bus of Characters
data structures
,
greedy
,
implementation
1300
x8330
982A
Row
brute force
,
constructive algorithms
1200
x9105
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x271
981G
Magic multisets
data structures
2500
x692
981F
Round Marriage
binary search
,
graph matchings
,
greedy
2500
x789
981E
Addition on Segments
bitmasks
,
data structures
,
divide and conquer
,
dp
2200
x2137
981D
Bookshelves
bitmasks
,
dp
,
greedy
1900
x3274
981C
Useful Decomposition
implementation
,
trees
1400
x5498
981B
Businessmen Problems
sortings
1000
x7012
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