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Codeforces Round #792 (Div. 1 + Div. 2)
11:54:12
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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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Custom test
Problems
#
Name
1667F
Yin Yang
implementation
3500
x28
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x34
720E
Cipher
implementation
3100
x44
72B
INI-file
*special problem
,
implementation
2200
x51
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x52
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x56
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x59
1090G
Combostone
games
,
implementation
2500
x73
1044E
Grid Sort
implementation
3100
x79
98B
Help King
implementation
,
probabilities
,
trees
2200
x80
1450H2
Multithreading (Hard Version)
combinatorics
,
implementation
,
math
3300
x83
331E1
Deja Vu
constructive algorithms
,
graphs
,
implementation
2900
x84
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x85
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x89
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x89
100G
Name the album
*special problem
,
data structures
,
implementation
1800
x89
336E
Vasily the Bear and Painting Square
bitmasks
,
combinatorics
,
dp
,
implementation
2700
x90
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x93
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x94
39G
Inverse Function
implementation
2400
x94
1089J
JS Minification
greedy
,
implementation
3200
x96
1361F
Johnny and New Toy
data structures
,
implementation
,
math
3300
x99
780H
Intranet of Buses
binary search
,
geometry
,
implementation
,
two pointers
3100
x99
1297F
Movie Fan
*special problem
,
data structures
,
greedy
,
implementation
,
sortings
x101
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x103
1603F
October 18, 2017
combinatorics
,
dp
,
implementation
,
math
2700
x104
472E
Design Tutorial: Learn from a Game
constructive algorithms
,
implementation
2800
x106
1012F
Passports
dp
,
implementation
3400
x110
105D
Entertaining Geodetics
brute force
,
dsu
,
implementation
2700
x113
100F
Polynom
*special problem
,
implementation
1800
x115
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x121
1098E
Fedya the Potter
binary search
,
implementation
,
math
,
number theory
3400
x128
1239F
Swiper, no swiping!
graphs
,
implementation
3400
x135
280E
Sequence Transformation
brute force
,
data structures
,
dp
,
implementation
,
math
3000
x138
1083D
The Fair Nut's getting crazy
data structures
,
implementation
3500
x142
316F3
Suns and Rays
constructive algorithms
,
dfs and similar
,
implementation
2200
x148
316F1
Suns and Rays
dfs and similar
,
implementation
2200
x151
331D1
Escaping on Beaveractor
dfs and similar
,
implementation
2400
x155
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x157
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x158
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x158
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x161
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x161
363E
Two Circles
brute force
,
data structures
,
implementation
2500
x166
1608F
MEX counting
combinatorics
,
dp
,
implementation
3200
x167
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x168
188G
Array Sorting
*special problem
,
implementation
1600
x172
97D
Robot in Basement
bitmasks
,
brute force
,
implementation
2700
x173
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x181
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x184
406E
Hamming Triples
implementation
,
math
,
two pointers
2800
x187
1495E
Qingshan and Daniel
brute force
,
data structures
,
greedy
,
implementation
3200
x198
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x201
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x202
171H
A polyline
*special problem
,
implementation
1700
x202
1109C
Sasha and a Patient Friend
binary search
,
data structures
,
implementation
2800
x204
238D
Tape Programming
data structures
,
implementation
2900
x205
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x206
40C
Berland Square
implementation
,
math
2300
x206
188H
Stack
*special problem
,
expression parsing
,
implementation
1800
x212
72H
Reverse It!
*special problem
,
implementation
1600
x215
44G
Shooting Gallery
data structures
,
implementation
2500
x217
288E
Polo the Penguin and Lucky Numbers
dp
,
implementation
,
math
2800
x218
257E
Greedy Elevator
data structures
,
implementation
2200
x220
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x221
1168D
Anagram Paths
dp
,
implementation
,
trees
3000
x221
97A
Domino
brute force
,
implementation
2400
x223
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x223
62C
Inquisition
geometry
,
implementation
,
sortings
2300
x223
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x225
1505G
Encoded message
*special problem
,
implementation
2600
x226
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x227
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x232
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x235
274E
Mirror Room
data structures
,
implementation
3000
x236
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x236
36C
Bowls
geometry
,
implementation
2200
x236
105C
Item World
brute force
,
implementation
,
sortings
2200
x239
188F
Binary Notation
*special problem
,
implementation
1400
x244
100B
Friendly Numbers
*special problem
,
implementation
1500
x244
241F
Race
brute force
,
implementation
2300
x245
182A
Battlefield
geometry
,
graphs
,
implementation
,
shortest paths
2200
x245
991F
Concise and clear
brute force
,
greedy
,
implementation
,
math
2700
x246
394D
Physical Education and Buns
brute force
,
implementation
,
math
x246
77D
Domino Carpet
dp
,
implementation
2300
x250
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x256
332E
Binary Key
dp
,
greedy
,
implementation
2400
x257
294D
Shaass and Painter Robot
brute force
,
implementation
,
number theory
2500
x258
32E
Hide-and-Seek
geometry
,
implementation
2400
x263
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x264
200E
Tractor College
implementation
,
math
,
number theory
,
ternary search
2400
x265
1578K
Kingdom of Islands
brute force
,
graphs
,
implementation
2800
x266
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x267
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x271
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x273
188E
HQ9+
*special problem
,
implementation
1400
x273
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x275
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x285
1571C
Rhyme
*special problem
,
implementation
1800
x286
1202F
You Are Given Some Letters...
binary search
,
implementation
,
math
2700
x286
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