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Before contest
Codeforces Round 987 (Div. 2)
09:49:11
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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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Custom test
Problems
#
Name
152C
Pocket Book
combinatorics
1400
x10663
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x860
150D
Mission Impassable
dp
,
strings
2600
x626
150C
Smart Cheater
data structures
,
math
,
probabilities
2200
x643
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x4210
150A
Win or Freeze
games
,
math
,
number theory
1400
x7855
149E
Martian Strings
string suffix structures
,
strings
2300
x2288
149D
Coloring Brackets
dp
1900
x3886
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5396
149B
Martian Clock
implementation
1600
x2262
148E
Porcelain
dp
1900
x4072
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x7323
148C
Terse princess
constructive algorithms
,
greedy
1700
x3144
148B
Escape
implementation
,
math
1500
x5508
147B
Smile House
binary search
,
graphs
,
matrices
2500
x787
145E
Lucky Queries
data structures
2400
x3192
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x243
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1911
145B
Lucky Number 2
constructive algorithms
1800
x2220
144E
Competition
data structures
,
greedy
2200
x590
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4022
144C
Anagram Search
implementation
,
strings
1500
x4015
142E
Help Greg the Dwarf 2
geometry
3000
x80
142D
Help Shrek and Donkey 2
games
2600
x347
142C
Help Caretaker
brute force
,
dp
2300
x926
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2219
142A
Help Farmer
brute force
,
math
1600
x2625
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x1096
141D
Take-off Ramps
graphs
,
shortest paths
2300
x899
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2469
141B
Hopscotch
geometry
,
math
1400
x5402
140F
New Year Snowflake
geometry
,
sortings
2600
x370
140E
New Year Garland
combinatorics
,
dp
2600
x947
140D
New Year Contest
greedy
,
sortings
1800
x2216
140C
New Year Snowmen
binary search
,
data structures
,
greedy
1800
x4383
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1683
140A
New Year Table
geometry
,
math
1700
x4151
139B
Wallpaper
implementation
,
math
1600
x1310
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x174
138D
World of Darkraft
dp
,
games
2500
x496
138C
Mushroom Gnomes - 2
binary search
,
data structures
,
probabilities
,
sortings
2200
x871
138B
Digits Permutations
greedy
1900
x1038
138A
Literature Lesson
implementation
1600
x2395
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1220
137D
Palindromes
dp
,
strings
1900
x1521
137C
History
sortings
1500
x7226
135E
Weak Subsequence
combinatorics
3000
x306
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x301
135C
Zero-One
constructive algorithms
,
games
,
greedy
1900
x1348
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2356
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x474
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x2048
132E
Bits of merry old England
flows
,
graphs
2700
x533
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x618
132C
Logo Turtle
dp
1800
x2352
132B
Piet
implementation
2100
x663
131F
Present to Mom
binary search
,
two pointers
2000
x649
131E
Yet Another Task with Queens
sortings
1700
x1856
131D
Subway
dfs and similar
,
graphs
1600
x4698
131C
The World is a Theatre
combinatorics
,
math
1400
x11204
130J
Date calculation
*special problem
1800
x341
130I
Array sorting
*special problem
,
sortings
2300
x167
130H
Balanced brackets
*special problem
1600
x605
130G
CAPS LOCK ON
*special problem
1700
x284
130F
Prime factorization
*special problem
1600
x278
130E
Tribonacci numbers
*special problem
1600
x296
130D
Exponentiation
*special problem
1500
x393
130C
Decimal sum
*special problem
1500
x501
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x531
128E
Birthday
geometry
,
math
2900
x99
128D
Numbers
constructive algorithms
,
implementation
2000
x1147
128C
Games with Rectangle
combinatorics
,
dp
2000
x2968
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2598
128A
Statues
dfs and similar
1500
x3211
126E
Pills
brute force
,
flows
2900
x83
126D
Fibonacci Sums
dp
,
math
2300
x835
126C
E-reader Display
constructive algorithms
,
greedy
2000
x723
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x19665
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1436
125E
MST Company
binary search
,
graphs
2400
x1090
125D
Two progressions
constructive algorithms
,
greedy
2200
x416
125C
Hobbits' Party
constructive algorithms
,
greedy
1600
x932
125A
Measuring Lengths in Baden
math
1400
x2735
124B
Permutations
brute force
,
combinatorics
,
implementation
1400
x3946
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x725
123D
String
string suffix structures
2300
x1231
123C
Brackets
combinatorics
,
dp
,
greedy
2300
x612
123B
Squares
math
1800
x1132
121E
Lucky Array
data structures
2400
x1731
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x277
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1288
121B
Lucky Transformation
strings
1500
x2577
120J
Minimum Sum
divide and conquer
,
geometry
,
sortings
1900
x923
120I
Luck is in Numbers
greedy
2200
x304
120H
Brevity is Soul of Wit
graph matchings
1800
x1413
120G
Boom
implementation
1800
x690
120F
Spiders
dp
,
greedy
,
trees
1400
x3624
120E
Put Knight!
games
,
math
1400
x2740
120D
Three Sons
brute force
1400
x1935
119E
Alternative Reality
geometry
2400
x95
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