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Codeforces and Polygon may be unavailable from
May 23, 4:00 (UTC)
to
May 23, 8:00 (UTC)
due to technical maintenance.
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Codeforces Round (Div. 1 + Div. 2)
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binary search
bitmasks
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data structures
dfs and similar
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expression parsing
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geometry
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graphs
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Problems
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Name
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x604
132C
Logo Turtle
dp
1800
x2275
132B
Piet
implementation
2100
x471
132A
Turing Tape
implementation
1300
x2738
131F
Present to Mom
binary search
,
two pointers
2000
x601
131E
Yet Another Task with Queens
sortings
1700
x1817
131D
Subway
dfs and similar
,
graphs
1600
x4514
131C
The World is a Theatre
combinatorics
,
math
1400
x10689
131B
Opposites Attract
implementation
,
math
1200
x6867
131A
cAPS lOCK
implementation
,
strings
1000
x81597
130J
Date calculation
*special problem
1800
x323
130I
Array sorting
*special problem
,
sortings
2300
x164
130H
Balanced brackets
*special problem
1600
x537
130G
CAPS LOCK ON
*special problem
1700
x273
130F
Prime factorization
*special problem
1600
x272
130E
Tribonacci numbers
*special problem
1600
x292
130D
Exponentiation
*special problem
1500
x382
130C
Decimal sum
*special problem
1500
x485
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x516
130A
Hexagonal numbers
*special problem
,
implementation
900
x1524
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x11728
129A
Cookies
implementation
900
x21834
128E
Birthday
geometry
,
math
2900
x96
128D
Numbers
constructive algorithms
,
implementation
2000
x1088
128C
Games with Rectangle
combinatorics
,
dp
2000
x2700
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2467
128A
Statues
dfs and similar
1500
x3131
127B
Canvas Frames
implementation
1000
x8232
127A
Wasted Time
geometry
900
x10774
126E
Pills
brute force
,
flows
2900
x82
126D
Fibonacci Sums
dp
,
math
2300
x807
126C
E-reader Display
constructive algorithms
,
greedy
2000
x711
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x17914
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1406
125E
MST Company
binary search
,
graphs
2400
x1011
125D
Two progressions
constructive algorithms
,
greedy
2200
x391
125C
Hobbits' Party
constructive algorithms
,
greedy
1600
x904
125B
Simple XML
implementation
1000
x2767
125A
Measuring Lengths in Baden
math
1400
x2644
124B
Permutations
brute force
,
combinatorics
,
implementation
1400
x3763
124A
The number of positions
math
1000
x36452
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x691
123D
String
string suffix structures
2300
x1183
123C
Brackets
combinatorics
,
dp
,
greedy
2300
x589
123B
Squares
math
1800
x1095
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3519
122B
Lucky Substring
brute force
,
implementation
1000
x12027
122A
Lucky Division
brute force
,
number theory
1000
x116758
121E
Lucky Array
data structures
2400
x1626
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x272
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1268
121B
Lucky Transformation
strings
1500
x2528
121A
Lucky Sum
implementation
1100
x8848
120J
Minimum Sum
divide and conquer
,
geometry
,
sortings
1900
x908
120I
Luck is in Numbers
greedy
2200
x302
120H
Brevity is Soul of Wit
graph matchings
1800
x1355
120G
Boom
implementation
1800
x680
120F
Spiders
dp
,
greedy
,
trees
1400
x3510
120E
Put Knight!
games
,
math
1400
x2650
120D
Three Sons
brute force
1400
x1901
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x3587
120B
Quiz League
implementation
1100
x3341
120A
Elevator
brute force
,
implementation
,
math
1000
x4506
119E
Alternative Reality
geometry
2400
x93
119D
String Transformation
hashing
,
strings
2500
x475
119C
Education Reform
dp
2000
x857
119B
Before Exam
constructive algorithms
,
implementation
,
sortings
1900
x1066
119A
Epic Game
implementation
800
x26945
118E
Bertown roads
dfs and similar
,
graphs
2000
x6019
118D
Caesar's Legions
dp
1700
x16748
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2523
118B
Present from Lena
constructive algorithms
,
implementation
1000
x28484
118A
String Task
implementation
,
strings
1000
x182193
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x311
117D
Not Quick Transformation
divide and conquer
,
math
2500
x330
117C
Cycle
dfs and similar
,
graphs
2000
x2550
117B
Very Interesting Game
brute force
,
number theory
1800
x1538
117A
Elevator
implementation
,
math
1300
x1974
116B
Little Pigs and Wolves
greedy
,
implementation
1100
x13451
116A
Tram
implementation
800
x132887
115E
Linear Kingdom Races
data structures
,
dp
2400
x1376
115D
Unambiguous Arithmetic Expression
dp
,
expression parsing
2600
x374
115C
Plumber
math
2200
x588
115B
Lawnmower
greedy
,
sortings
1500
x2429
115A
Party
dfs and similar
,
graphs
,
trees
900
x32938
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3541
114A
Cifera
math
1000
x13881
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x116
113D
Museum
math
,
matrices
,
probabilities
2700
x652
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1202
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2728
113A
Grammar Lessons
implementation
,
strings
1600
x2239
112B
Petya and Square
implementation
,
math
1200
x4072
112A
Petya and Strings
implementation
,
strings
800
x210525
111E
Petya and Rectangle
2900
x64
111D
Petya and Coloring
combinatorics
,
dp
2300
x719
111C
Petya and Spiders
bitmasks
,
dp
,
dsu
2100
x1273
111B
Petya and Divisors
binary search
,
data structures
,
number theory
1900
x3549
111A
Petya and Inequiations
greedy
1400
x4642
110B
Lucky String
constructive algorithms
,
strings
1100
x9969
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