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Codeforces Round 986 (Div. 2)
09:03:51
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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
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Status
Standings
Custom test
Problems
#
Name
238D
Tape Programming
data structures
,
implementation
2900
x247
237B
Young Table
implementation
,
sortings
1500
x2237
237A
Free Cash
implementation
1000
x26916
236B
Easy Number Challenge
implementation
,
number theory
1300
x14380
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x213228
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x778
234G
Practice
constructive algorithms
,
divide and conquer
,
implementation
1600
x1480
234E
Champions' League
implementation
1600
x1002
234D
Cinema
implementation
1600
x1540
234C
Weather
dp
,
implementation
1300
x5555
234A
Lefthanders and Righthanders
implementation
1200
x4475
233A
Perfect Permutation
implementation
,
math
800
x42811
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x76315
228B
Two Tables
brute force
,
implementation
1400
x3469
228A
Is your horseshoe on the other hoof?
implementation
800
x111358
227B
Effective Approach
implementation
1100
x28222
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x914
225D
Snake
bitmasks
,
dfs and similar
,
graphs
,
implementation
2200
x949
224B
Array
bitmasks
,
implementation
,
two pointers
1500
x7352
223A
Bracket Sequence
data structures
,
expression parsing
,
implementation
1700
x2539
222C
Reducing Fractions
implementation
,
math
,
number theory
,
sortings
1800
x2252
222B
Cosmic Tables
data structures
,
implementation
1300
x6132
222A
Shooshuns and Sequence
brute force
,
implementation
1200
x10823
221B
Little Elephant and Numbers
implementation
1300
x4583
221A
Little Elephant and Function
implementation
,
math
1000
x15285
220A
Little Elephant and Problem
implementation
,
sortings
1300
x12010
219B
Special Offer! Super Price 999 Bourles!
implementation
1400
x5825
219A
k-String
implementation
,
strings
1000
x28007
218B
Airport
implementation
1100
x16546
218A
Mountain Scenery
brute force
,
constructive algorithms
,
implementation
1100
x9498
216B
Forming Teams
dfs and similar
,
implementation
1700
x6396
216A
Tiling with Hexagons
implementation
,
math
1200
x5016
215C
Crosses
brute force
,
implementation
2100
x668
215A
Bicycle Chain
brute force
,
implementation
900
x14567
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x334
208D
Prizes, Prizes, more Prizes
implementation
1200
x7597
205A
Little Elephant and Rozdil
brute force
,
implementation
900
x22509
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x1168
203D
Hit Ball
geometry
,
implementation
,
math
1700
x1418
203B
Game on Paper
brute force
,
implementation
1300
x2603
203A
Two Problems
brute force
,
implementation
1200
x4183
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x16984
200E
Tractor College
implementation
,
math
,
number theory
,
ternary search
2400
x344
200D
Programming Language
binary search
,
brute force
,
expression parsing
,
implementation
1800
x916
200C
Football Championship
brute force
,
implementation
1800
x1060
200B
Drinks
implementation
,
math
800
x117558
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x26689
198A
About Bacteria
implementation
,
math
1700
x3154
195C
Try and Catch
expression parsing
,
implementation
1800
x1143
195B
After Training
data structures
,
implementation
,
math
1300
x5208
194A
Exams
implementation
,
math
900
x9896
192B
Walking in the Rain
brute force
,
implementation
1100
x6272
192A
Funky Numbers
binary search
,
brute force
,
implementation
1300
x10429
188H
Stack
*special problem
,
expression parsing
,
implementation
1800
x266
188G
Array Sorting
*special problem
,
implementation
1600
x334
188F
Binary Notation
*special problem
,
implementation
1400
x301
188E
HQ9+
*special problem
,
implementation
1400
x500
188D
Asterisks
*special problem
,
implementation
1100
x682
188C
LCM
*special problem
,
implementation
,
math
1400
x453
188B
A + Reverse B
*special problem
,
implementation
1300
x735
186A
Comparing Strings
implementation
,
strings
1100
x17105
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x8091
182B
Vasya's Calendar
implementation
1000
x6943
182A
Battlefield
geometry
,
graphs
,
implementation
,
shortest paths
2200
x284
181A
Series of Crimes
brute force
,
geometry
,
implementation
800
x7140
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2527
180A
Defragmentation
implementation
1800
x541
177A2
Good Matrix Elements
implementation
800
x7363
177A1
Good Matrix Elements
implementation
800
x8719
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x66
175C
Geometry Horse
greedy
,
implementation
,
sortings
,
two pointers
1600
x1319
175B
Plane of Tanks: Pro
implementation
1400
x1422
175A
Robot Bicorn Attack
brute force
,
implementation
1400
x2390
174B
File List
dp
,
greedy
,
implementation
1400
x2244
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x250
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2298
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1146
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2781
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x6155
171H
A polyline
*special problem
,
implementation
1700
x282
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1284
171C
A Piece of Cake
*special problem
,
implementation
2000
x1095
168B
Wizards and Minimal Spell
implementation
,
strings
1700
x1222
168A
Wizards and Demonstration
implementation
,
math
900
x10609
167A
Wizards and Trolleybuses
implementation
,
math
1600
x2044
166A
Rank List
binary search
,
implementation
,
sortings
1100
x17824
165B
Burning Midnight Oil
binary search
,
implementation
1500
x18134
165A
Supercentral Point
implementation
1000
x23655
162A
Pentagonal numbers
*special problem
,
implementation
1100
x804
160C
Find Pair
implementation
,
math
,
sortings
1700
x3458
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2483
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x9239
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x87613
158A
Next Round
*special problem
,
implementation
800
x252153
156B
Suspects
constructive algorithms
,
data structures
,
implementation
1600
x2234
152B
Steps
binary search
,
implementation
1300
x6738
152A
Marks
implementation
900
x16832
151B
Phone Numbers
implementation
,
strings
1200
x6389
151A
Soft Drinking
implementation
,
math
800
x74314
149B
Martian Clock
implementation
1600
x2261
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