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Codeforces Round 1002 (Div. 2)
3 days
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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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Custom test
Problems
#
Name
178D2
Magic Squares
1900
x274
178D1
Magic Squares
1500
x655
178C3
Smart Beaver and Resolving Collisions
2000
x328
178C2
Smart Beaver and Resolving Collisions
1900
x310
178C1
Smart Beaver and Resolving Collisions
1600
x497
178B3
Greedy Merchants
1800
x1262
178B2
Greedy Merchants
1600
x686
178B1
Greedy Merchants
1600
x774
178A3
Educational Game
greedy
1100
x1467
178A2
Educational Game
greedy
1000
x1666
178A1
Educational Game
1000
x1649
177G2
Fibonacci Strings
matrices
,
strings
2600
x207
177G1
Fibonacci Strings
strings
2400
x192
177F2
Script Generation
2300
x211
177F1
Script Generation
1800
x306
177E2
Space Voyage
binary search
1900
x439
177E1
Space Voyage
binary search
1700
x630
177D2
Encrypting Messages
data structures
1500
x2087
177D1
Encrypting Messages
brute force
1200
x2254
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2629
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x2629
177B2
Rectangular Game
number theory
1200
x3091
177B1
Rectangular Game
number theory
1000
x4357
177A2
Good Matrix Elements
implementation
800
x7487
177A1
Good Matrix Elements
implementation
800
x9303
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x1233
176D
Hyper String
dp
2500
x332
176C
Playing with Superglue
combinatorics
,
constructive algorithms
2000
x490
176B
Word Cut
dp
1700
x1899
176A
Trading Business
greedy
,
sortings
1200
x1530
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x66
175E
Power Defence
brute force
,
dp
,
geometry
,
greedy
2600
x268
175D
Plane of Tanks: Duel
brute force
,
dp
,
math
,
probabilities
2400
x301
175C
Geometry Horse
greedy
,
implementation
,
sortings
,
two pointers
1600
x1343
175B
Plane of Tanks: Pro
implementation
1400
x1438
175A
Robot Bicorn Attack
brute force
,
implementation
1400
x2427
174C
Range Increments
data structures
,
greedy
1800
x1164
174B
File List
dp
,
greedy
,
implementation
1400
x2309
174A
Problem About Equation
math
1100
x3004
173E
Camping Groups
data structures
,
sortings
2600
x577
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x256
173C
Spiral Maximum
brute force
,
dp
1900
x1005
173B
Chamber of Secrets
dfs and similar
,
shortest paths
1800
x3288
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2336
172E
BHTML+BCSS
*special problem
,
dfs and similar
,
expression parsing
2200
x273
172D
Calendar Reform
*special problem
,
number theory
1500
x1409
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1152
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2799
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x6397
171H
A polyline
*special problem
,
implementation
1700
x288
171G
Mysterious numbers - 2
*special problem
1600
x950
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1306
171E
MYSTERIOUS LANGUAGE
*special problem
2000
x1483
171D
Broken checker
*special problem
,
brute force
1300
x2605
171C
A Piece of Cake
*special problem
,
implementation
2000
x1106
171B
Star
*special problem
,
combinatorics
1300
x4115
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4542
169B
Replacing Digits
greedy
1100
x3348
169A
Chores
sortings
800
x7099
168B
Wizards and Minimal Spell
implementation
,
strings
1700
x1226
168A
Wizards and Demonstration
implementation
,
math
900
x10732
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x582
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x200
167C
Wizards and Numbers
games
,
math
2300
x684
167B
Wizards and Huge Prize
dp
,
math
,
probabilities
1800
x2209
167A
Wizards and Trolleybuses
implementation
,
math
1600
x2051
166E
Tetrahedron
dp
,
math
,
matrices
1500
x21846
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x368
166C
Median
greedy
,
math
,
sortings
1500
x6593
166B
Polygons
geometry
,
sortings
2100
x2550
166A
Rank List
binary search
,
implementation
,
sortings
1100
x18189
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x7215
165D
Beard Graph
data structures
,
dsu
,
trees
2100
x1707
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x12507
165B
Burning Midnight Oil
binary search
,
implementation
1500
x18905
165A
Supercentral Point
implementation
1000
x24082
164E
Polycarpus and Tasks
3100
x67
164D
Minimum Diameter
binary search
,
brute force
3100
x248
164C
Machine Programming
flows
,
graphs
2400
x907
164B
Ancient Berland Hieroglyphs
two pointers
2000
x479
164A
Variable, or There and Back Again
dfs and similar
,
graphs
1700
x1022
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1762
163D
Large Refrigerator
brute force
2900
x516
163C
Conveyor
sortings
,
two pointers
2100
x559
163B
Lemmings
binary search
2000
x1071
163A
Substring and Subsequence
dp
1700
x2749
162J
Brackets
*special problem
1800
x99
162I
Truncatable primes
*special problem
2000
x78
162H
Alternating case
*special problem
1800
x222
162G
Non-decimal sum
*special problem
2000
x67
162F
Factorial zeros
*special problem
1800
x205
162E
HQ9+
*special problem
1800
x179
162D
Remove digits
*special problem
1900
x229
162C
Prime factorization
*special problem
1800
x853
162B
Binary notation
*special problem
1800
x315
162A
Pentagonal numbers
*special problem
,
implementation
1100
x818
161E
Polycarpus the Safecracker
brute force
,
dp
2500
x474
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x15563
161C
Abracadabra
divide and conquer
2400
x656
161B
Discounts
constructive algorithms
,
greedy
,
sortings
1700
x1968
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