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Before contest
Codeforces Round 941 (Div. 1)
20:15:07
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Before contest
Codeforces Round 941 (Div. 2)
20:15:07
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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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Problems
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Custom test
Problems
#
Name
205A
Little Elephant and Rozdil
brute force
,
implementation
900
x21461
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x1077
203D
Hit Ball
geometry
,
implementation
,
math
1700
x1398
203B
Game on Paper
brute force
,
implementation
1300
x2541
203A
Two Problems
brute force
,
implementation
1200
x4111
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x15831
200E
Tractor College
implementation
,
math
,
number theory
,
ternary search
2400
x332
200D
Programming Language
binary search
,
brute force
,
expression parsing
,
implementation
1800
x870
200C
Football Championship
brute force
,
implementation
1800
x996
200B
Drinks
implementation
,
math
800
x107305
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x25000
198A
About Bacteria
implementation
,
math
1700
x3101
195C
Try and Catch
expression parsing
,
implementation
1800
x1111
195B
After Training
data structures
,
implementation
,
math
1300
x5117
194A
Exams
implementation
,
math
900
x9617
192B
Walking in the Rain
brute force
,
implementation
1100
x6138
192A
Funky Numbers
binary search
,
brute force
,
implementation
1300
x10110
188H
Stack
*special problem
,
expression parsing
,
implementation
1800
x244
188G
Array Sorting
*special problem
,
implementation
1600
x324
188F
Binary Notation
*special problem
,
implementation
1400
x286
188E
HQ9+
*special problem
,
implementation
1400
x489
188D
Asterisks
*special problem
,
implementation
1100
x647
188C
LCM
*special problem
,
implementation
,
math
1400
x434
188B
A + Reverse B
*special problem
,
implementation
1300
x701
186A
Comparing Strings
implementation
,
strings
1100
x16190
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7799
182B
Vasya's Calendar
implementation
1000
x6789
182A
Battlefield
geometry
,
graphs
,
implementation
,
shortest paths
2200
x278
181A
Series of Crimes
brute force
,
geometry
,
implementation
800
x6693
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2447
180A
Defragmentation
implementation
1800
x522
177A2
Good Matrix Elements
implementation
800
x7040
177A1
Good Matrix Elements
implementation
800
x8165
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x64
175C
Geometry Horse
greedy
,
implementation
,
sortings
,
two pointers
1600
x1288
175B
Plane of Tanks: Pro
implementation
1400
x1358
175A
Robot Bicorn Attack
brute force
,
implementation
1400
x2334
174B
File List
dp
,
greedy
,
implementation
1400
x2188
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x246
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2198
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1129
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2685
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x5888
171H
A polyline
*special problem
,
implementation
1700
x265
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1243
171C
A Piece of Cake
*special problem
,
implementation
2000
x1052
168B
Wizards and Minimal Spell
implementation
,
strings
1700
x1198
168A
Wizards and Demonstration
implementation
,
math
900
x10276
167A
Wizards and Trolleybuses
implementation
,
math
1600
x2010
166A
Rank List
binary search
,
implementation
,
sortings
1100
x16713
165B
Burning Midnight Oil
binary search
,
implementation
1500
x16409
165A
Supercentral Point
implementation
1000
x22532
162A
Pentagonal numbers
*special problem
,
implementation
1100
x789
160C
Find Pair
implementation
,
math
,
sortings
1700
x3380
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2453
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x8866
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x82214
158A
Next Round
*special problem
,
implementation
800
x231628
156B
Suspects
constructive algorithms
,
data structures
,
implementation
1600
x2181
152B
Steps
binary search
,
implementation
1300
x6315
152A
Marks
implementation
900
x16148
151B
Phone Numbers
implementation
,
strings
1200
x6211
151A
Soft Drinking
implementation
,
math
800
x65448
149B
Martian Clock
implementation
1600
x2220
149A
Business trip
greedy
,
implementation
,
sortings
900
x37596
148B
Escape
implementation
,
math
1500
x5255
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x86819
147A
Punctuation
implementation
,
strings
1300
x3550
146B
Lucky Mask
brute force
,
implementation
1300
x4219
146A
Lucky Ticket
implementation
800
x14576
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x237
145A
Lucky Conversion
greedy
,
implementation
1200
x6953
144C
Anagram Search
implementation
,
strings
1500
x3880
144B
Meeting
implementation
1300
x5021
144A
Arrival of the General
implementation
800
x88652
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x4910
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2130
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x77619
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1476
139B
Wallpaper
implementation
,
math
1600
x1273
139A
Petr and Book
implementation
1000
x28552
138A
Literature Lesson
implementation
1600
x2335
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1186
137A
Postcards and photos
implementation
900
x6875
136B
Ternary Logic
implementation
,
math
1100
x4639
136A
Presents
implementation
800
x108684
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x293
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7423
134A
Average Numbers
brute force
,
implementation
1200
x3794
133B
Unary
implementation
1200
x8616
133A
HQ9+
implementation
900
x99659
132B
Piet
implementation
2100
x470
132A
Turing Tape
implementation
1300
x2725
131B
Opposites Attract
implementation
,
math
1200
x6857
131A
cAPS lOCK
implementation
,
strings
1000
x80973
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x515
130A
Hexagonal numbers
*special problem
,
implementation
900
x1518
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x11660
129A
Cookies
implementation
900
x21685
128D
Numbers
constructive algorithms
,
implementation
2000
x1087
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