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Before contest
Codeforces Round 941 (Div. 1)
4 days
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Before contest
Codeforces Round 941 (Div. 2)
4 days
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→ Filter Problems
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implementation
combine-tags-by-or
*combine tags by OR
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
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x42
720E
Cipher
implementation
3100
x62
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x64
1868F
LIS?
data structures
,
greedy
,
implementation
3500
x68
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x74
72B
INI-file
*special problem
,
implementation
2200
x75
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x79
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x84
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x88
1667F
Yin Yang
implementation
3500
x91
1718E
Impressionism
constructive algorithms
,
graphs
,
implementation
,
math
3500
x102
1090G
Combostone
games
,
implementation
2500
x103
336E
Vasily the Bear and Painting Square
bitmasks
,
combinatorics
,
dp
,
implementation
2700
x109
100G
Name the album
*special problem
,
data structures
,
implementation
1800
x109
1044E
Grid Sort
implementation
3100
x112
1297F
Movie Fan
*special problem
,
data structures
,
greedy
,
implementation
,
sortings
x113
98B
Help King
implementation
,
probabilities
,
trees
2200
x114
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x115
780H
Intranet of Buses
binary search
,
geometry
,
implementation
,
two pointers
3100
x116
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x118
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x120
1089J
JS Minification
greedy
,
implementation
3200
x120
39G
Inverse Function
implementation
2400
x123
472E
Design Tutorial: Learn from a Game
constructive algorithms
,
implementation
2800
x128
100F
Polynom
*special problem
,
implementation
1800
x132
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x133
105D
Entertaining Geodetics
brute force
,
dsu
,
implementation
2700
x135
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x137
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x141
1361F
Johnny and New Toy
data structures
,
implementation
,
math
3300
x142
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x149
1012F
Passports
dp
,
implementation
3400
x152
1450H2
Multithreading (Hard Version)
combinatorics
,
implementation
,
math
3300
x162
331E1
Deja Vu
constructive algorithms
,
graphs
,
implementation
2900
x162
316F3
Suns and Rays
constructive algorithms
,
dfs and similar
,
implementation
2200
x163
316F1
Suns and Rays
dfs and similar
,
implementation
2200
x164
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x168
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x168
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x170
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x178
1765I
Infinite Chess
implementation
,
shortest paths
2800
x181
363E
Two Circles
brute force
,
data structures
,
implementation
2500
x192
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x193
331D1
Escaping on Beaveractor
dfs and similar
,
implementation
2400
x194
280E
Sequence Transformation
brute force
,
data structures
,
dp
,
implementation
,
math
3000
x196
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x201
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x205
1098E
Fedya the Potter
binary search
,
implementation
,
math
,
number theory
3400
x211
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x217
1083D
The Fair Nut's getting crazy
data structures
,
implementation
3500
x224
406E
Hamming Triples
implementation
,
math
,
two pointers
2800
x226
97D
Robot in Basement
bitmasks
,
brute force
,
implementation
2700
x229
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x232
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x237
40C
Berland Square
implementation
,
math
2300
x239
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x244
1109C
Sasha and a Patient Friend
binary search
,
data structures
,
implementation
2800
x244
238D
Tape Programming
data structures
,
implementation
2900
x244
188H
Stack
*special problem
,
expression parsing
,
implementation
1800
x244
1239F
Swiper, no swiping!
graphs
,
implementation
3400
x245
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x246
62C
Inquisition
geometry
,
implementation
,
sortings
2300
x247
97A
Domino
brute force
,
implementation
2400
x250
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x251
1900F
Local Deletions
binary search
,
data structures
,
implementation
2800
x253
1884E
Hard Design
greedy
,
implementation
,
math
2800
x257
72H
Reverse It!
*special problem
,
implementation
1600
x258
241F
Race
brute force
,
implementation
2300
x259
394D
Physical Education and Buns
brute force
,
implementation
,
math
x261
1860F
Evaluate RBS
data structures
,
geometry
,
implementation
,
math
,
sortings
2900
x262
1603F
October 18, 2017
combinatorics
,
dp
,
implementation
,
math
2700
x264
171H
A polyline
*special problem
,
implementation
1700
x265
105C
Item World
brute force
,
implementation
,
sortings
2200
x268
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x270
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x272
257E
Greedy Elevator
data structures
,
implementation
2200
x275
182A
Battlefield
geometry
,
graphs
,
implementation
,
shortest paths
2200
x278
288E
Polo the Penguin and Lucky Numbers
dp
,
implementation
,
math
2800
x281
188F
Binary Notation
*special problem
,
implementation
1400
x286
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x290
1505G
Encoded message
*special problem
,
implementation
2600
x291
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x293
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x294
991F
Concise and clear
brute force
,
greedy
,
implementation
,
math
2700
x294
332E
Binary Key
dp
,
greedy
,
implementation
2400
x294
36C
Bowls
geometry
,
implementation
2200
x294
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
x297
294D
Shaass and Painter Robot
brute force
,
implementation
,
number theory
2500
x298
274E
Mirror Room
data structures
,
implementation
3000
x299
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x301
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x306
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x307
77D
Domino Carpet
dp
,
implementation
2300
x309
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x311
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x312
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x316
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x317
32E
Hide-and-Seek
geometry
,
implementation
2400
x320
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x321
188G
Array Sorting
*special problem
,
implementation
1600
x324
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