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Rayan
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Before contest
Codeforces Round 995 (Div. 3)
07:03:53
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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
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Name
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2481
141B
Hopscotch
geometry
,
math
1400
x5428
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x85402
140F
New Year Snowflake
geometry
,
sortings
2600
x373
140E
New Year Garland
combinatorics
,
dp
2600
x955
140D
New Year Contest
greedy
,
sortings
1800
x2218
140C
New Year Snowmen
binary search
,
data structures
,
greedy
1800
x4397
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1684
140A
New Year Table
geometry
,
math
1700
x4167
139B
Wallpaper
implementation
,
math
1600
x1315
139A
Petr and Book
implementation
1000
x31874
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x174
138D
World of Darkraft
dp
,
games
2500
x498
138C
Mushroom Gnomes - 2
binary search
,
data structures
,
probabilities
,
sortings
2200
x875
138B
Digits Permutations
greedy
1900
x1039
138A
Literature Lesson
implementation
1600
x2397
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1249
137D
Palindromes
dp
,
strings
1900
x1529
137C
History
sortings
1500
x7263
137B
Permutation
greedy
1000
x13802
137A
Postcards and photos
implementation
900
x7255
136B
Ternary Logic
implementation
,
math
1100
x4899
136A
Presents
implementation
800
x121234
135E
Weak Subsequence
combinatorics
3000
x307
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x301
135C
Zero-One
constructive algorithms
,
games
,
greedy
1900
x1351
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2381
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7663
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x477
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x2061
134A
Average Numbers
brute force
,
implementation
1200
x4064
133B
Unary
implementation
1200
x8850
133A
HQ9+
implementation
900
x107767
132E
Bits of merry old England
flows
,
graphs
2700
x534
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x618
132C
Logo Turtle
dp
1800
x2360
132B
Piet
implementation
2100
x663
132A
Turing Tape
implementation
1300
x2792
131F
Present to Mom
binary search
,
two pointers
2000
x652
131E
Yet Another Task with Queens
sortings
1700
x1867
131D
Subway
dfs and similar
,
graphs
1600
x4725
131C
The World is a Theatre
combinatorics
,
math
1400
x11283
131B
Opposites Attract
implementation
,
math
1200
x7078
131A
cAPS lOCK
implementation
,
strings
1000
x87390
130J
Date calculation
*special problem
1800
x341
130I
Array sorting
*special problem
,
sortings
2300
x168
130H
Balanced brackets
*special problem
1600
x609
130G
CAPS LOCK ON
*special problem
1700
x285
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
x535
130A
Hexagonal numbers
*special problem
,
implementation
900
x1648
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x12438
129A
Cookies
implementation
900
x22988
128E
Birthday
geometry
,
math
2900
x99
128D
Numbers
constructive algorithms
,
implementation
2000
x1152
128C
Games with Rectangle
combinatorics
,
dp
2000
x2994
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2613
128A
Statues
dfs and similar
1500
x3225
127B
Canvas Frames
implementation
1000
x8993
127A
Wasted Time
geometry
900
x11349
126E
Pills
brute force
,
flows
2900
x88
126D
Fibonacci Sums
dp
,
math
2300
x842
126C
E-reader Display
constructive algorithms
,
greedy
2000
x744
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x19927
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1437
125E
MST Company
binary search
,
graphs
2400
x1101
125D
Two progressions
constructive algorithms
,
greedy
2200
x416
125C
Hobbits' Party
constructive algorithms
,
greedy
1600
x934
125B
Simple XML
implementation
1000
x2990
125A
Measuring Lengths in Baden
math
1400
x2754
124B
Permutations
brute force
,
combinatorics
,
implementation
1400
x3986
124A
The number of positions
math
1000
x39040
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x726
123D
String
string suffix structures
2300
x1234
123C
Brackets
combinatorics
,
dp
,
greedy
2300
x617
123B
Squares
math
1800
x1137
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3651
122B
Lucky Substring
brute force
,
implementation
1000
x12424
122A
Lucky Division
brute force
,
number theory
1000
x126756
121E
Lucky Array
data structures
2400
x1751
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x278
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1289
121B
Lucky Transformation
strings
1500
x2588
121A
Lucky Sum
implementation
1100
x9324
120J
Minimum Sum
divide and conquer
,
geometry
,
sortings
1900
x939
120I
Luck is in Numbers
greedy
2200
x306
120H
Brevity is Soul of Wit
graph matchings
1800
x1418
120G
Boom
implementation
1800
x690
120F
Spiders
dp
,
greedy
,
trees
1400
x3673
120E
Put Knight!
games
,
math
1400
x2745
120D
Three Sons
brute force
1400
x1942
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x3695
120B
Quiz League
implementation
1100
x3453
120A
Elevator
brute force
,
implementation
,
math
1000
x4869
119E
Alternative Reality
geometry
2400
x96
119D
String Transformation
hashing
,
strings
2500
x507
119C
Education Reform
dp
2000
x960
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