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Codeforces Round 998 (Div. 3)
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combine-tags-by-or
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2-sat
binary search
bitmasks
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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
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strings
ternary search
trees
two pointers
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Problems
#
Name
175B
Plane of Tanks: Pro
implementation
1400
x1436
175A
Robot Bicorn Attack
brute force
,
implementation
1400
x2425
174C
Range Increments
data structures
,
greedy
1800
x1164
174B
File List
dp
,
greedy
,
implementation
1400
x2304
174A
Problem About Equation
math
1100
x2995
173E
Camping Groups
data structures
,
sortings
2600
x575
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x254
173C
Spiral Maximum
brute force
,
dp
1900
x1003
173B
Chamber of Secrets
dfs and similar
,
shortest paths
1800
x3279
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2334
172E
BHTML+BCSS
*special problem
,
dfs and similar
,
expression parsing
2200
x272
172D
Calendar Reform
*special problem
,
number theory
1500
x1407
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1151
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2799
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x6377
171H
A polyline
*special problem
,
implementation
1700
x286
171G
Mysterious numbers - 2
*special problem
1600
x944
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1301
171E
MYSTERIOUS LANGUAGE
*special problem
2000
x1481
171D
Broken checker
*special problem
,
brute force
1300
x2597
171C
A Piece of Cake
*special problem
,
implementation
2000
x1103
171B
Star
*special problem
,
combinatorics
1300
x4106
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4538
169B
Replacing Digits
greedy
1100
x3344
169A
Chores
sortings
800
x7082
168B
Wizards and Minimal Spell
implementation
,
strings
1700
x1225
168A
Wizards and Demonstration
implementation
,
math
900
x10717
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
x199
167C
Wizards and Numbers
games
,
math
2300
x682
167B
Wizards and Huge Prize
dp
,
math
,
probabilities
1800
x2185
167A
Wizards and Trolleybuses
implementation
,
math
1600
x2050
166E
Tetrahedron
dp
,
math
,
matrices
1500
x21804
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x367
166C
Median
greedy
,
math
,
sortings
1500
x6587
166B
Polygons
geometry
,
sortings
2100
x2549
166A
Rank List
binary search
,
implementation
,
sortings
1100
x18135
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x7184
165D
Beard Graph
data structures
,
dsu
,
trees
2100
x1704
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x12490
165B
Burning Midnight Oil
binary search
,
implementation
1500
x18839
165A
Supercentral Point
implementation
1000
x24016
164E
Polycarpus and Tasks
3100
x67
164D
Minimum Diameter
binary search
,
brute force
3100
x248
164C
Machine Programming
flows
,
graphs
2400
x906
164B
Ancient Berland Hieroglyphs
two pointers
2000
x479
164A
Variable, or There and Back Again
dfs and similar
,
graphs
1700
x1021
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1757
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
x2745
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
x817
161E
Polycarpus the Safecracker
brute force
,
dp
2500
x473
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x15477
161C
Abracadabra
divide and conquer
2400
x655
161B
Discounts
constructive algorithms
,
greedy
,
sortings
1700
x1968
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4958
160E
Buses and People
binary search
,
data structures
,
sortings
2400
x598
160D
Edges in MST
dfs and similar
,
dsu
,
graphs
,
sortings
2300
x2848
160C
Find Pair
implementation
,
math
,
sortings
1700
x3477
160B
Unlucky Ticket
greedy
,
sortings
1100
x14246
160A
Twins
greedy
,
sortings
900
x121740
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x1008
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4342
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x3015
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3829
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2501
158E
Phone Talks
*special problem
,
dp
,
sortings
1900
x1466
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6269
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x9398
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x89298
158A
Next Round
*special problem
,
implementation
800
x260959
157B
Trace
geometry
,
sortings
1000
x13372
157A
Game Outcome
brute force
800
x7755
156E
Mrs. Hudson's Pancakes
brute force
,
dp
3000
x163
156D
Clues
combinatorics
,
graphs
2500
x1640
156C
Cipher
combinatorics
,
dp
2000
x2440
156B
Suspects
constructive algorithms
,
data structures
,
implementation
1600
x2257
156A
Message
brute force
1700
x3057
155B
Combination
greedy
,
sortings
1100
x10367
155A
I_love_\%username\%
brute force
800
x78256
154E
Martian Colony
geometry
3000
x98
154D
Flatland Fencing
games
,
math
2400
x437
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2923
154B
Colliders
math
,
number theory
1600
x4943
154A
Hometask
greedy
1600
x4107
153E
Euclidean Distance
*special problem
2100
x81
153D
Date Change
*special problem
2000
x85
153C
Caesar Cipher
*special problem
2200
x393
153B
Binary notation
*special problem
1800
x159
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