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Codeforces Round 998 (Div. 3)
00:00:57
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IAEPC Preliminary Contest (Codeforces Round 999, Div. 1 + Div. 2)
21:30:57
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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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Custom test
Problems
#
Name
242E
XOR on Segment
bitmasks
,
data structures
2000
x9749
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1891
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8931
242B
Big Segment
implementation
,
sortings
1100
x15994
242A
Heads or Tails
brute force
,
implementation
1100
x6445
241G
Challenging Balloons
constructive algorithms
1900
x551
241F
Race
brute force
,
implementation
2300
x265
241E
Flights
graphs
,
shortest paths
2600
x1128
241D
Numbers
2900
x383
241C
Mirror Box
geometry
,
implementation
2000
x513
241B
Friends
binary search
,
bitmasks
,
data structures
,
math
2700
x865
241A
Old Peykan
greedy
1300
x2263
240F
TorCoder
data structures
2600
x2002
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x357
239B
Easy Tape Programming
brute force
,
implementation
1500
x1378
239A
Two Bags of Potatoes
greedy
,
implementation
,
math
1200
x19213
238E
Meeting Her
dp
,
graphs
,
shortest paths
2600
x401
238D
Tape Programming
data structures
,
implementation
2900
x253
238C
World Eater Brothers
dfs and similar
,
dp
,
greedy
,
trees
2100
x1256
238B
Boring Partition
constructive algorithms
1800
x1341
238A
Not Wool Sequences
constructive algorithms
,
math
1300
x2056
237E
Build String
flows
,
graphs
2000
x1775
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x573
237C
Primes on Interval
binary search
,
number theory
,
two pointers
1600
x5920
237B
Young Table
implementation
,
sortings
1500
x2246
237A
Free Cash
implementation
1000
x27262
236B
Easy Number Challenge
implementation
,
number theory
1300
x14625
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x222040
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x787
235D
Graph Game
graphs
3000
x509
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x2172
235B
Let's Play Osu!
dp
,
math
,
probabilities
2000
x3636
235A
LCM Challenge
number theory
1600
x18209
234H
Merging Two Decks
constructive algorithms
,
greedy
2000
x574
234G
Practice
constructive algorithms
,
divide and conquer
,
implementation
1600
x1495
234F
Fence
dp
1800
x1786
234E
Champions' League
implementation
1600
x1004
234D
Cinema
implementation
1600
x1548
234C
Weather
dp
,
implementation
1300
x5605
234B
Reading
sortings
1000
x7181
234A
Lefthanders and Righthanders
implementation
1200
x4499
233B
Non-square Equation
binary search
,
brute force
,
math
1400
x7604
233A
Perfect Permutation
implementation
,
math
800
x43737
232E
Quick Tortoise
bitmasks
,
divide and conquer
,
dp
3000
x706
232D
Fence
binary search
,
data structures
,
string suffix structures
2900
x488
232C
Doe Graphs
constructive algorithms
,
divide and conquer
,
dp
,
graphs
,
shortest paths
2600
x292
232B
Table
bitmasks
,
combinatorics
,
dp
,
math
1900
x1490
232A
Cycles
binary search
,
constructive algorithms
,
graphs
,
greedy
1600
x2597
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1933
231D
Magic Box
brute force
,
geometry
1600
x4148
231C
To Add or Not to Add
binary search
,
sortings
,
two pointers
1600
x8737
231B
Magic, Wizardry and Wonders
constructive algorithms
,
greedy
1500
x3641
231A
Team
brute force
,
greedy
800
x342993
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x78540
230A
Dragons
greedy
,
sortings
1000
x81934
229E
Gifts
combinatorics
,
dp
,
math
,
probabilities
2600
x471
229D
Towers
dp
,
greedy
,
two pointers
2100
x2297
229C
Triangles
combinatorics
,
graphs
,
math
1900
x1651
229B
Planets
binary search
,
data structures
,
graphs
,
shortest paths
1700
x4800
229A
Shifts
brute force
,
two pointers
1500
x3553
228E
The Road to Berland is Paved With Good Intentions
2-sat
,
dfs and similar
,
dsu
,
graphs
1900
x2538
228D
Zigzag
data structures
2100
x387
228C
Fractal Detector
dp
,
hashing
2000
x470
228B
Two Tables
brute force
,
implementation
1400
x3483
228A
Is your horseshoe on the other hoof?
implementation
800
x114991
227B
Effective Approach
implementation
1100
x28790
227A
Where do I Turn?
geometry
1300
x4271
226E
Noble Knight's Path
data structures
,
trees
2900
x473
226D
The table
constructive algorithms
,
greedy
2100
x979
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x920
226B
Naughty Stone Piles
greedy
1900
x1570
226A
Flying Saucer Segments
math
1400
x4032
225E
Unsolvable
math
,
number theory
2100
x821
225D
Snake
bitmasks
,
dfs and similar
,
graphs
,
implementation
2200
x953
225C
Barcode
dp
,
matrices
1700
x9321
225B
Well-known Numbers
binary search
,
greedy
,
number theory
1600
x3187
225A
Dice Tower
constructive algorithms
,
greedy
1100
x11915
224B
Array
bitmasks
,
implementation
,
two pointers
1500
x7413
224A
Parallelepiped
brute force
,
geometry
,
math
1100
x27364
223E
Planar Graph
flows
,
geometry
,
graphs
3000
x193
223D
Spider
geometry
,
graphs
3000
x71
223C
Partial Sums
combinatorics
,
math
,
number theory
1900
x1599
223B
Two Strings
data structures
,
dp
,
strings
1900
x1827
223A
Bracket Sequence
data structures
,
expression parsing
,
implementation
1700
x2553
222E
Decoding Genome
dp
,
matrices
1900
x2900
222D
Olympiad
binary search
,
greedy
,
sortings
,
two pointers
1900
x2184
222C
Reducing Fractions
implementation
,
math
,
number theory
,
sortings
1800
x2358
222B
Cosmic Tables
data structures
,
implementation
1300
x6177
222A
Shooshuns and Sequence
brute force
,
implementation
1200
x10935
221B
Little Elephant and Numbers
implementation
1300
x4618
221A
Little Elephant and Function
implementation
,
math
1000
x15489
220E
Little Elephant and Inversions
data structures
,
two pointers
2400
x1439
220D
Little Elephant and Triangle
geometry
,
math
2500
x287
220C
Little Elephant and Shifts
data structures
2100
x952
220B
Little Elephant and Array
constructive algorithms
,
data structures
1800
x10625
220A
Little Elephant and Problem
implementation
,
sortings
1300
x12077
219E
Parking Lot
data structures
2200
x622
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x9815
219C
Color Stripe
brute force
,
dp
,
greedy
1600
x6726
219B
Special Offer! Super Price 999 Bourles!
implementation
1400
x5871
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