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Codeforces Round 937 (Div. 4)
05:04:14
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Difficulty:
—
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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Problems
#
Name
1868F
LIS?
data structures
,
greedy
,
implementation
3500
x67
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x78
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x88
1667F
Yin Yang
implementation
3500
x88
1718E
Impressionism
constructive algorithms
,
graphs
,
implementation
,
math
3500
x101
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x124
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x128
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x135
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x138
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x185
1083D
The Fair Nut's getting crazy
data structures
,
implementation
3500
x222
1012F
Passports
dp
,
implementation
3400
x149
1098E
Fedya the Potter
binary search
,
implementation
,
math
,
number theory
3400
x208
1239F
Swiper, no swiping!
graphs
,
implementation
3400
x243
1361F
Johnny and New Toy
data structures
,
implementation
,
math
3300
x140
1450H2
Multithreading (Hard Version)
combinatorics
,
implementation
,
math
3300
x159
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x331
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x42
1089J
JS Minification
greedy
,
implementation
3200
x119
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x221
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x289
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x337
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x379
1495E
Qingshan and Daniel
brute force
,
data structures
,
greedy
,
implementation
3200
x390
1608F
MEX counting
combinatorics
,
dp
,
implementation
3200
x507
585F
Digits of Number Pi
dp
,
implementation
,
strings
3200
x632
720E
Cipher
implementation
3100
x61
1044E
Grid Sort
implementation
3100
x110
780H
Intranet of Buses
binary search
,
geometry
,
implementation
,
two pointers
3100
x115
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x228
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x238
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x265
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x323
1119G
Get Ready for the Battle
constructive algorithms
,
implementation
3100
x405
633H
Fibonacci-ish II
data structures
,
implementation
3100
x557
1239E
Turtle
dp
,
implementation
3100
x887
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x62
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x165
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x166
280E
Sequence Transformation
brute force
,
data structures
,
dp
,
implementation
,
math
3000
x190
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x241
274E
Mirror Room
data structures
,
implementation
3000
x278
1168D
Anagram Paths
dp
,
implementation
,
trees
3000
x331
375E
Red and Black Tree
dp
,
implementation
,
math
3000
x394
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x395
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x419
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x492
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x627
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x82
331E1
Deja Vu
constructive algorithms
,
graphs
,
implementation
2900
x160
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x195
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x199
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x215
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x234
238D
Tape Programming
data structures
,
implementation
2900
x241
1860F
Evaluate RBS
data structures
,
geometry
,
implementation
,
math
,
sortings
2900
x260
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x302
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x303
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x308
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x310
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x323
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x384
704C
Black Widow
dp
,
graphs
,
implementation
,
math
2900
x448
1687D
Cute number
binary search
,
brute force
,
data structures
,
dsu
,
implementation
,
math
2900
x552
472E
Design Tutorial: Learn from a Game
constructive algorithms
,
implementation
2800
x127
1765I
Infinite Chess
implementation
,
shortest paths
2800
x175
406E
Hamming Triples
implementation
,
math
,
two pointers
2800
x225
1109C
Sasha and a Patient Friend
binary search
,
data structures
,
implementation
2800
x235
1900F
Local Deletions
binary search
,
data structures
,
implementation
2800
x247
1884E
Hard Design
greedy
,
implementation
,
math
2800
x253
288E
Polo the Penguin and Lucky Numbers
dp
,
implementation
,
math
2800
x279
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x284
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x292
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x311
1578K
Kingdom of Islands
brute force
,
graphs
,
implementation
2800
x345
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x358
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x361
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x400
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x406
1608E
The Cells on the Paper
binary search
,
implementation
,
sortings
2800
x419
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x460
722F
Cyclic Cipher
chinese remainder theorem
,
data structures
,
implementation
,
number theory
,
two pointers
2800
x468
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x471
1371F
Raging Thunder
data structures
,
divide and conquer
,
implementation
2800
x498
1697F
Too Many Constraints
2-sat
,
constructive algorithms
,
graphs
,
implementation
2800
x501
1303F
Number of Components
dsu
,
implementation
2800
x508
1698F
Equal Reversal
constructive algorithms
,
graphs
,
implementation
,
math
2800
x543
1648D
Serious Business
data structures
,
divide and conquer
,
dp
,
implementation
,
shortest paths
2800
x761
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x1066
280D
k-Maximum Subsequence Sum
data structures
,
flows
,
graphs
,
implementation
2800
x1147
336E
Vasily the Bear and Painting Square
bitmasks
,
combinatorics
,
dp
,
implementation
2700
x107
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x111
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x119
105D
Entertaining Geodetics
brute force
,
dsu
,
implementation
2700
x132
97D
Robot in Basement
bitmasks
,
brute force
,
implementation
2700
x228
1603F
October 18, 2017
combinatorics
,
dp
,
implementation
,
math
2700
x258
991F
Concise and clear
brute force
,
greedy
,
implementation
,
math
2700
x293
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x314
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x324
1202F
You Are Given Some Letters...
binary search
,
implementation
,
math
2700
x366
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