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Codeforces Round 973 (Div. 2)
13:58:50
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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
237B
Young Table
implementation
,
sortings
1500
x2231
237A
Free Cash
implementation
1000
x26643
236B
Easy Number Challenge
implementation
,
number theory
1300
x14106
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x207197
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x775
235D
Graph Game
graphs
3000
x504
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x2092
235B
Let's Play Osu!
dp
,
math
,
probabilities
2000
x3487
235A
LCM Challenge
number theory
1600
x17624
234H
Merging Two Decks
constructive algorithms
,
greedy
2000
x562
234G
Practice
constructive algorithms
,
divide and conquer
,
implementation
1600
x1469
234F
Fence
dp
1800
x1732
234E
Champions' League
implementation
1600
x997
234D
Cinema
implementation
1600
x1527
234C
Weather
dp
,
implementation
1300
x5450
234B
Reading
sortings
1000
x7088
234A
Lefthanders and Righthanders
implementation
1200
x4423
233B
Non-square Equation
binary search
,
brute force
,
math
1400
x7444
233A
Perfect Permutation
implementation
,
math
800
x42127
232E
Quick Tortoise
bitmasks
,
divide and conquer
,
dp
3000
x689
232D
Fence
binary search
,
data structures
,
string suffix structures
2900
x474
232C
Doe Graphs
constructive algorithms
,
divide and conquer
,
dp
,
graphs
,
shortest paths
2600
x286
232B
Table
bitmasks
,
combinatorics
,
dp
,
math
1900
x1428
232A
Cycles
binary search
,
constructive algorithms
,
graphs
,
greedy
1600
x2512
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1834
231D
Magic Box
brute force
,
geometry
1600
x4073
231C
To Add or Not to Add
binary search
,
sortings
,
two pointers
1600
x8589
231B
Magic, Wizardry and Wonders
constructive algorithms
,
greedy
1500
x3598
231A
Team
brute force
,
greedy
800
x320309
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x74335
230A
Dragons
greedy
,
sortings
1000
x78461
229E
Gifts
combinatorics
,
dp
,
math
,
probabilities
2600
x459
229D
Towers
dp
,
greedy
,
two pointers
2100
x2213
229C
Triangles
combinatorics
,
graphs
,
math
1900
x1614
229B
Planets
binary search
,
data structures
,
graphs
,
shortest paths
1700
x4636
229A
Shifts
brute force
,
two pointers
1500
x3496
228E
The Road to Berland is Paved With Good Intentions
2-sat
,
dfs and similar
,
dsu
,
graphs
1900
x2422
228D
Zigzag
data structures
2100
x381
228C
Fractal Detector
dp
,
hashing
2000
x453
228B
Two Tables
brute force
,
implementation
1400
x3459
228A
Is your horseshoe on the other hoof?
implementation
800
x108715
227B
Effective Approach
implementation
1100
x27815
227A
Where do I Turn?
geometry
1300
x4170
226E
Noble Knight's Path
data structures
,
trees
2900
x457
226D
The table
constructive algorithms
,
greedy
2100
x958
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x864
226B
Naughty Stone Piles
greedy
1900
x1550
226A
Flying Saucer Segments
math
1400
x3975
225E
Unsolvable
math
,
number theory
2100
x798
225D
Snake
bitmasks
,
dfs and similar
,
graphs
,
implementation
2200
x944
225C
Barcode
dp
,
matrices
1700
x9066
225B
Well-known Numbers
binary search
,
greedy
,
number theory
1600
x3145
225A
Dice Tower
constructive algorithms
,
greedy
1100
x11601
224B
Array
bitmasks
,
implementation
,
two pointers
1500
x7302
224A
Parallelepiped
brute force
,
geometry
,
math
1100
x26521
223E
Planar Graph
flows
,
geometry
,
graphs
3000
x191
223D
Spider
geometry
,
graphs
3000
x70
223C
Partial Sums
combinatorics
,
math
,
number theory
1900
x1549
223B
Two Strings
data structures
,
dp
,
strings
1900
x1777
223A
Bracket Sequence
data structures
,
expression parsing
,
implementation
1700
x2513
222E
Decoding Genome
dp
,
matrices
1900
x2749
222D
Olympiad
binary search
,
greedy
,
sortings
,
two pointers
1900
x2156
222C
Reducing Fractions
implementation
,
math
,
number theory
,
sortings
1800
x2176
222B
Cosmic Tables
data structures
,
implementation
1300
x6088
222A
Shooshuns and Sequence
brute force
,
implementation
1200
x10722
221B
Little Elephant and Numbers
implementation
1300
x4555
221A
Little Elephant and Function
implementation
,
math
1000
x15151
220E
Little Elephant and Inversions
data structures
,
two pointers
2400
x1375
220D
Little Elephant and Triangle
geometry
,
math
2500
x283
220C
Little Elephant and Shifts
data structures
2100
x935
220B
Little Elephant and Array
constructive algorithms
,
data structures
1800
x10043
220A
Little Elephant and Problem
implementation
,
sortings
1300
x11961
219E
Parking Lot
data structures
2200
x614
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x9289
219C
Color Stripe
brute force
,
dp
,
greedy
1600
x6642
219B
Special Offer! Super Price 999 Bourles!
implementation
1400
x5798
219A
k-String
implementation
,
strings
1000
x27538
218B
Airport
implementation
1100
x16344
218A
Mountain Scenery
brute force
,
constructive algorithms
,
implementation
1100
x9364
217E
Alien DNA
data structures
,
dsu
,
trees
2800
x322
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x250
217C
Formurosa
divide and conquer
,
dp
,
expression parsing
2600
x336
217B
Blackboard Fibonacci
brute force
,
math
2100
x889
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x21054
216E
Martian Luck
math
,
number theory
2000
x577
216D
Spider's Web
binary search
,
sortings
,
two pointers
1700
x1348
216C
Hiring Staff
greedy
1800
x1834
216B
Forming Teams
dfs and similar
,
implementation
1700
x6322
216A
Tiling with Hexagons
implementation
,
math
1200
x4990
215E
Periodical Numbers
combinatorics
,
dp
,
number theory
2100
x550
215D
Hot Days
greedy
1900
x1592
215C
Crosses
brute force
,
implementation
2100
x664
215B
Olympic Medal
greedy
,
math
1300
x5552
215A
Bicycle Chain
brute force
,
implementation
900
x14425
214B
Hometask
brute force
,
constructive algorithms
,
greedy
,
math
1600
x4954
214A
System of Equations
brute force
800
x35081
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x792
213D
Stars
constructive algorithms
,
geometry
2300
x338
213C
Relay Race
dp
2000
x2835
213B
Numbers
combinatorics
,
dp
1900
x1744
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