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Codeforces Round 1006 (Div. 3)
3 days
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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
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number theory
probabilities
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shortest paths
sortings
string suffix structures
strings
ternary search
trees
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Problems
#
Name
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1940
145B
Lucky Number 2
constructive algorithms
1800
x2245
145A
Lucky Conversion
greedy
,
implementation
1200
x7225
144E
Competition
data structures
,
greedy
2200
x608
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4178
144C
Anagram Search
implementation
,
strings
1500
x4055
144B
Meeting
implementation
1300
x5364
144A
Arrival of the General
implementation
800
x101343
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x5067
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x14256
142E
Help Greg the Dwarf 2
geometry
3000
x83
142D
Help Shrek and Donkey 2
games
2600
x355
142C
Help Caretaker
brute force
,
dp
2300
x936
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2264
142A
Help Farmer
brute force
,
math
1600
x2660
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x1167
141D
Take-off Ramps
graphs
,
shortest paths
2300
x922
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2501
141B
Hopscotch
geometry
,
math
1400
x5478
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x87509
140F
New Year Snowflake
geometry
,
sortings
2600
x379
140E
New Year Garland
combinatorics
,
dp
2600
x967
140D
New Year Contest
greedy
,
sortings
1800
x2225
140C
New Year Snowmen
binary search
,
data structures
,
greedy
1800
x4428
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1690
140A
New Year Table
geometry
,
math
1700
x4186
139B
Wallpaper
implementation
,
math
1600
x1332
139A
Petr and Book
implementation
1000
x32774
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x177
138D
World of Darkraft
dp
,
games
2500
x505
138C
Mushroom Gnomes - 2
binary search
,
data structures
,
probabilities
,
sortings
2200
x882
138B
Digits Permutations
greedy
1900
x1043
138A
Literature Lesson
implementation
1600
x2411
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1258
137D
Palindromes
dp
,
strings
1900
x1537
137C
History
sortings
1500
x7345
137B
Permutation
greedy
1000
x13992
137A
Postcards and photos
implementation
900
x7328
136B
Ternary Logic
implementation
,
math
1100
x5019
136A
Presents
implementation
800
x124907
135E
Weak Subsequence
combinatorics
3000
x314
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x307
135C
Zero-One
constructive algorithms
,
games
,
greedy
1900
x1358
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2419
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7726
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x479
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x2120
134A
Average Numbers
brute force
,
implementation
1200
x4132
133B
Unary
implementation
1200
x8906
133A
HQ9+
implementation
900
x110074
132E
Bits of merry old England
flows
,
graphs
2700
x544
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x629
132C
Logo Turtle
dp
1800
x2374
132B
Piet
implementation
2100
x671
132A
Turing Tape
implementation
1300
x2805
131F
Present to Mom
binary search
,
two pointers
2000
x664
131E
Yet Another Task with Queens
sortings
1700
x1874
131D
Subway
dfs and similar
,
graphs
1600
x4808
131C
The World is a Theatre
combinatorics
,
math
1400
x11527
131B
Opposites Attract
implementation
,
math
1200
x7106
131A
cAPS lOCK
implementation
,
strings
1000
x89256
130J
Date calculation
*special problem
1800
x343
130I
Array sorting
*special problem
,
sortings
2300
x171
130H
Balanced brackets
*special problem
1600
x627
130G
CAPS LOCK ON
*special problem
1700
x290
130F
Prime factorization
*special problem
1600
x282
130E
Tribonacci numbers
*special problem
1600
x302
130D
Exponentiation
*special problem
1500
x403
130C
Decimal sum
*special problem
1500
x513
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x543
130A
Hexagonal numbers
*special problem
,
implementation
900
x1690
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x12582
129A
Cookies
implementation
900
x23311
128E
Birthday
geometry
,
math
2900
x101
128D
Numbers
constructive algorithms
,
implementation
2000
x1166
128C
Games with Rectangle
combinatorics
,
dp
2000
x3011
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2636
128A
Statues
dfs and similar
1500
x3243
127B
Canvas Frames
implementation
1000
x9143
127A
Wasted Time
geometry
900
x11475
126E
Pills
brute force
,
flows
2900
x91
126D
Fibonacci Sums
dp
,
math
2300
x857
126C
E-reader Display
constructive algorithms
,
greedy
2000
x750
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x20446
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1450
125E
MST Company
binary search
,
graphs
2400
x1129
125D
Two progressions
constructive algorithms
,
greedy
2200
x423
125C
Hobbits' Party
constructive algorithms
,
greedy
1600
x944
125B
Simple XML
implementation
1000
x3056
125A
Measuring Lengths in Baden
math
1400
x2776
124B
Permutations
brute force
,
combinatorics
,
implementation
1400
x4115
124A
The number of positions
math
1000
x39793
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x741
123D
String
string suffix structures
2300
x1240
123C
Brackets
combinatorics
,
dp
,
greedy
2300
x625
123B
Squares
math
1800
x1144
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3671
122B
Lucky Substring
brute force
,
implementation
1000
x12515
122A
Lucky Division
brute force
,
number theory
1000
x129670
121E
Lucky Array
data structures
2400
x1770
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