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Codeforces Round 997 (Div. 2)
2 days
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Difficulty:
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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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Problems
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Status
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Custom test
Problems
#
Name
178B2
Greedy Merchants
1600
x684
178B1
Greedy Merchants
1600
x773
177E1
Space Voyage
binary search
1700
x627
177D2
Encrypting Messages
data structures
1500
x2073
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2618
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x2617
176B
Word Cut
dp
1700
x1890
175C
Geometry Horse
greedy
,
implementation
,
sortings
,
two pointers
1600
x1336
175B
Plane of Tanks: Pro
implementation
1400
x1436
175A
Robot Bicorn Attack
brute force
,
implementation
1400
x2425
174B
File List
dp
,
greedy
,
implementation
1400
x2304
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2333
172D
Calendar Reform
*special problem
,
number theory
1500
x1407
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1151
171H
A polyline
*special problem
,
implementation
1700
x286
171G
Mysterious numbers - 2
*special problem
1600
x942
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1301
171D
Broken checker
*special problem
,
brute force
1300
x2597
171B
Star
*special problem
,
combinatorics
1300
x4105
168B
Wizards and Minimal Spell
implementation
,
strings
1700
x1225
167A
Wizards and Trolleybuses
implementation
,
math
1600
x2050
166E
Tetrahedron
dp
,
math
,
matrices
1500
x21779
166C
Median
greedy
,
math
,
sortings
1500
x6583
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x12485
165B
Burning Midnight Oil
binary search
,
implementation
1500
x18814
164A
Variable, or There and Back Again
dfs and similar
,
graphs
1700
x1021
163A
Substring and Subsequence
dp
1700
x2743
161B
Discounts
constructive algorithms
,
greedy
,
sortings
1700
x1967
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4957
160C
Find Pair
implementation
,
math
,
sortings
1700
x3476
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
x3014
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2499
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6268
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x9392
156B
Suspects
constructive algorithms
,
data structures
,
implementation
1600
x2255
156A
Message
brute force
1700
x3056
154B
Colliders
math
,
number theory
1600
x4912
154A
Hometask
greedy
1600
x4106
153A
A + B
*special problem
1600
x828
152C
Pocket Book
combinatorics
1400
x10751
152B
Steps
binary search
,
implementation
1300
x6829
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x4306
150A
Win or Freeze
games
,
math
,
number theory
1400
x7975
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5428
149B
Martian Clock
implementation
1600
x2285
148C
Terse princess
constructive algorithms
,
greedy
1700
x3165
148B
Escape
implementation
,
math
1500
x5566
147A
Punctuation
implementation
,
strings
1300
x3698
146B
Lucky Mask
brute force
,
implementation
1300
x4447
144C
Anagram Search
implementation
,
strings
1500
x4044
144B
Meeting
implementation
1300
x5331
142A
Help Farmer
brute force
,
math
1600
x2652
141B
Hopscotch
geometry
,
math
1400
x5439
140A
New Year Table
geometry
,
math
1700
x4179
139B
Wallpaper
implementation
,
math
1600
x1328
138A
Literature Lesson
implementation
1600
x2407
137C
History
sortings
1500
x7279
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2391
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7690
132A
Turing Tape
implementation
1300
x2801
131E
Yet Another Task with Queens
sortings
1700
x1870
131D
Subway
dfs and similar
,
graphs
1600
x4752
131C
The World is a Theatre
combinatorics
,
math
1400
x11388
130H
Balanced brackets
*special problem
1600
x618
130G
CAPS LOCK ON
*special problem
1700
x289
130F
Prime factorization
*special problem
1600
x281
130E
Tribonacci numbers
*special problem
1600
x299
130D
Exponentiation
*special problem
1500
x399
130C
Decimal sum
*special problem
1500
x509
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x540
128A
Statues
dfs and similar
1500
x3230
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x20125
125C
Hobbits' Party
constructive algorithms
,
greedy
1600
x939
125A
Measuring Lengths in Baden
math
1400
x2761
124B
Permutations
brute force
,
combinatorics
,
implementation
1400
x4039
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3659
121B
Lucky Transformation
strings
1500
x2595
120F
Spiders
dp
,
greedy
,
trees
1400
x3684
120E
Put Knight!
games
,
math
1400
x2767
120D
Three Sons
brute force
1400
x1946
118D
Caesar's Legions
dp
1700
x17835
117A
Elevator
implementation
,
math
1300
x2035
115B
Lawnmower
greedy
,
sortings
1500
x2634
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3773
113A
Grammar Lessons
implementation
,
strings
1600
x2312
111A
Petya and Inequiations
greedy
1400
x4824
108B
Datatypes
math
,
sortings
1400
x2492
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x3572
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x5172
106D
Treasure Island
brute force
,
implementation
1700
x1372
106C
Buns
dp
1700
x6118
105A
Transmigration
implementation
1700
x1847
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x9085
101B
Buses
binary search
,
data structures
,
dp
1700
x2654
100I
Rotation
*special problem
,
geometry
,
math
1500
x359
100E
Lamps in a Line
*special problem
,
math
1600
x279
100D
World of Mouth
*special problem
,
strings
1500
x312
100C
A+B
*special problem
,
implementation
1400
x548
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