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Before contest
Codeforces Round 970 (Div. 3)
02:06:16
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Difficulty:
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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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Status
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Custom test
Problems
#
Name
67A
Partial Teacher
dp
,
graphs
,
greedy
,
implementation
1800
x2104
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3136
66C
Petya and File System
data structures
,
implementation
1800
x1014
65B
Harry Potter and the History of Magic
brute force
,
greedy
,
implementation
1700
x1335
65A
Harry Potter and Three Spells
implementation
,
math
1800
x1805
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x239
64D
Presents
*special problem
,
greedy
1800
x286
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x335
64B
Expression
*special problem
,
expression parsing
1500
x1010
63C
Bulls and Cows
brute force
,
implementation
1700
x1668
62B
Tyndex.Brome
binary search
,
implementation
1800
x1282
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6481
60B
Serial Time!
dfs and similar
,
dsu
1400
x4544
59C
Title
expression parsing
1600
x2068
58C
Trees
brute force
1800
x2013
57B
Martian Architecture
implementation
1600
x1007
56C
Corporation Mail
data structures
,
expression parsing
,
implementation
1700
x1146
55B
Smallest number
brute force
1600
x2823
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x755
53D
Physical Education
sortings
1500
x1992
53B
Blog Photo
binary search
,
implementation
1700
x1395
52B
Right Triangles
combinatorics
1600
x2022
51C
Three Base Stations
binary search
,
greedy
1800
x1914
51B
bHTML Tables Analisys
expression parsing
1700
x862
50B
Choosing Symbol Pairs
strings
1500
x5637
49D
Game
brute force
,
dp
,
implementation
1800
x1888
49C
Disposition
constructive algorithms
,
math
1700
x1676
49B
Sum
math
1500
x2455
48D
Permutations
greedy
1500
x2486
48C
The Race
math
1800
x774
46D
Parking Lot
data structures
,
implementation
1800
x972
46C
Hamsters and Tigers
two pointers
1600
x2400
45J
Planting Trees
constructive algorithms
1800
x930
45I
TCMCF+++
greedy
1400
x2370
44H
Phone Number
dp
1700
x1721
44E
Anfisa the Monkey
dp
1400
x5029
44D
Hyperdrive
math
1800
x706
44B
Cola
implementation
1500
x1955
42B
Game of chess unfinished
implementation
1700
x937
42A
Guilty --- to the kitchen!
greedy
,
implementation
1400
x2817
41B
Martian Dollar
brute force
1400
x3975
40B
Repaintings
math
1600
x1151
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2934
38E
Let's Go Rolling!
dp
,
sortings
1800
x2562
38C
Blinds
brute force
1400
x2144
37B
Computer Game
greedy
,
implementation
1800
x887
36B
Fractal
implementation
1600
x1471
35D
Animals
dp
,
greedy
1700
x3277
35C
Fire Again
brute force
,
dfs and similar
,
shortest paths
1500
x6721
35B
Warehouse
implementation
1700
x1004
34D
Road Map
dfs and similar
,
graphs
1600
x5059
33C
Wonderful Randomized Sum
greedy
1800
x2970
33B
String Problem
shortest paths
1800
x4427
32D
Constellation
implementation
1600
x1270
32C
Flea
math
1700
x2123
31C
Schedule
implementation
1700
x1780
31B
Sysadmin Bob
greedy
,
implementation
,
strings
1500
x4233
30C
Shooting Gallery
dp
,
probabilities
1800
x1931
30B
Codeforces World Finals
implementation
1700
x1175
30A
Accounting
brute force
,
math
1400
x3430
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x4822
29B
Traffic Lights
implementation
1500
x2932
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4579
28A
Bender Problem
implementation
1600
x787
26B
Regular Bracket Sequence
greedy
1400
x18812
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1248
24B
F1 Champions
implementation
1500
x1769
24A
Ring road
graphs
1400
x5015
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3314
22C
System Administrator
graphs
1700
x3064
22B
Bargaining Table
brute force
,
dp
1500
x4185
20A
BerOS file system
implementation
1700
x6128
19A
World Football Cup
implementation
1400
x2726
18B
Platforms
brute force
,
math
1700
x2120
18A
Triangle
brute force
,
geometry
1500
x5942
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4706
16C
Monitor
binary search
,
number theory
1800
x4696
15B
Laser
math
1800
x1452
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3322
11B
Jumping Jack
math
1600
x4643
10B
Cinema Cashier
dp
,
implementation
1500
x1760
8B
Obsession with Robots
constructive algorithms
,
graphs
,
implementation
1400
x4316
7C
Line
math
,
number theory
1800
x4567
7B
Memory Manager
implementation
1600
x2580
4D
Mysterious Present
dp
,
sortings
1700
x10192
3C
Tic-tac-toe
brute force
,
games
,
implementation
1800
x7267
2A
Winner
hashing
,
implementation
1500
x26050
1B
Spreadsheet
implementation
,
math
1600
x22417
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