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Rayan Programming Contest 2024 - Selection (Codeforces Round, Div. 1 + Div. 2)
5 days
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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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Problems
#
Name
144A
Arrival of the General
implementation
800
x97555
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x4997
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x13963
142E
Help Greg the Dwarf 2
geometry
3000
x81
142D
Help Shrek and Donkey 2
games
2600
x348
142C
Help Caretaker
brute force
,
dp
2300
x932
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2221
142A
Help Farmer
brute force
,
math
1600
x2633
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x1103
141D
Take-off Ramps
graphs
,
shortest paths
2300
x903
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2472
141B
Hopscotch
geometry
,
math
1400
x5408
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x84438
140F
New Year Snowflake
geometry
,
sortings
2600
x370
140E
New Year Garland
combinatorics
,
dp
2600
x948
140D
New Year Contest
greedy
,
sortings
1800
x2217
140C
New Year Snowmen
binary search
,
data structures
,
greedy
1800
x4388
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1683
140A
New Year Table
geometry
,
math
1700
x4159
139B
Wallpaper
implementation
,
math
1600
x1311
139A
Petr and Book
implementation
1000
x31580
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x174
138D
World of Darkraft
dp
,
games
2500
x497
138C
Mushroom Gnomes - 2
binary search
,
data structures
,
probabilities
,
sortings
2200
x871
138B
Digits Permutations
greedy
1900
x1039
138A
Literature Lesson
implementation
1600
x2395
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1243
137D
Palindromes
dp
,
strings
1900
x1524
137C
History
sortings
1500
x7234
137B
Permutation
greedy
1000
x13765
137A
Postcards and photos
implementation
900
x7219
136B
Ternary Logic
implementation
,
math
1100
x4886
136A
Presents
implementation
800
x119669
135E
Weak Subsequence
combinatorics
3000
x306
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x301
135C
Zero-One
constructive algorithms
,
games
,
greedy
1900
x1349
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2363
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7648
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x475
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x2052
134A
Average Numbers
brute force
,
implementation
1200
x4006
133B
Unary
implementation
1200
x8828
133A
HQ9+
implementation
900
x106738
132E
Bits of merry old England
flows
,
graphs
2700
x533
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x618
132C
Logo Turtle
dp
1800
x2353
132B
Piet
implementation
2100
x663
132A
Turing Tape
implementation
1300
x2786
131F
Present to Mom
binary search
,
two pointers
2000
x649
131E
Yet Another Task with Queens
sortings
1700
x1856
131D
Subway
dfs and similar
,
graphs
1600
x4701
131C
The World is a Theatre
combinatorics
,
math
1400
x11231
131B
Opposites Attract
implementation
,
math
1200
x7058
131A
cAPS lOCK
implementation
,
strings
1000
x86602
130J
Date calculation
*special problem
1800
x341
130I
Array sorting
*special problem
,
sortings
2300
x167
130H
Balanced brackets
*special problem
1600
x606
130G
CAPS LOCK ON
*special problem
1700
x284
130F
Prime factorization
*special problem
1600
x278
130E
Tribonacci numbers
*special problem
1600
x296
130D
Exponentiation
*special problem
1500
x394
130C
Decimal sum
*special problem
1500
x503
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x532
130A
Hexagonal numbers
*special problem
,
implementation
900
x1635
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x12372
129A
Cookies
implementation
900
x22884
128E
Birthday
geometry
,
math
2900
x99
128D
Numbers
constructive algorithms
,
implementation
2000
x1147
128C
Games with Rectangle
combinatorics
,
dp
2000
x2971
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2601
128A
Statues
dfs and similar
1500
x3212
127B
Canvas Frames
implementation
1000
x8904
127A
Wasted Time
geometry
900
x11305
126E
Pills
brute force
,
flows
2900
x83
126D
Fibonacci Sums
dp
,
math
2300
x839
126C
E-reader Display
constructive algorithms
,
greedy
2000
x723
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x19735
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1437
125E
MST Company
binary search
,
graphs
2400
x1095
125D
Two progressions
constructive algorithms
,
greedy
2200
x416
125C
Hobbits' Party
constructive algorithms
,
greedy
1600
x932
125B
Simple XML
implementation
1000
x2951
125A
Measuring Lengths in Baden
math
1400
x2739
124B
Permutations
brute force
,
combinatorics
,
implementation
1400
x3950
124A
The number of positions
math
1000
x38797
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x725
123D
String
string suffix structures
2300
x1232
123C
Brackets
combinatorics
,
dp
,
greedy
2300
x616
123B
Squares
math
1800
x1134
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3641
122B
Lucky Substring
brute force
,
implementation
1000
x12393
122A
Lucky Division
brute force
,
number theory
1000
x125428
121E
Lucky Array
data structures
2400
x1740
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x277
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1288
121B
Lucky Transformation
strings
1500
x2578
121A
Lucky Sum
implementation
1100
x9283
120J
Minimum Sum
divide and conquer
,
geometry
,
sortings
1900
x936
120I
Luck is in Numbers
greedy
2200
x304
120H
Brevity is Soul of Wit
graph matchings
1800
x1415
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