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Codeforces Round 950 (Div. 3)
45:41:47
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Difficulty:
—
brute force
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
#
Name
1823B
Sort with Step
brute force
,
math
,
sortings
900
x15417
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2331
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6580
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x5666
1822A
TubeTube Feed
brute force
,
implementation
800
x23713
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2270
1821D
Black Cells
binary search
,
brute force
,
greedy
,
math
1900
x4789
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x13711
1821B
Sort the Subarray
brute force
,
greedy
1100
x17151
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x601
1819A
Constructive Problem
brute force
,
greedy
1300
x12156
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x252
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x3897
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2880
1814F
Communication Towers
brute force
,
divide and conquer
,
dsu
2700
x472
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x828
1814B
Long Legs
brute force
,
math
1700
x9617
1812B
Was it Rated?
*special problem
,
*special problem
,
*special problem
,
brute force
,
implementation
x5591
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x2996
1810C
Make It Permutation
brute force
,
greedy
,
sortings
1300
x13909
1810A
Beautiful Sequence
brute force
,
greedy
800
x20433
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x424
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2186
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x3606
1808A
Lucky Numbers
brute force
,
implementation
900
x17435
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x17981
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x5945
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2705
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7269
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x829
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1535
1805A
We Need the Zero
bitmasks
,
brute force
800
x21407
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1375
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4445
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11604
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12175
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12236
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x778
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x10893
1798E
Multitest Generator
brute force
,
dp
2300
x1537
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x15984
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1203
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3729
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x170
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18603
1795B
Ideal Point
brute force
,
geometry
,
greedy
900
x21279
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23293
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1302
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x375
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1316
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13420
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x11634
1791D
Distinct Split
brute force
,
greedy
,
strings
1000
x27350
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3171
1790C
Premutation
brute force
,
implementation
,
math
1000
x23092
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x523
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x773
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1590
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15853
1789A
Serval and Mocha's Array
brute force
,
math
,
number theory
800
x17291
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3749
1788A
One and Two
brute force
,
implementation
,
math
800
x27993
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x400
1786B
Cake Assembly Line
brute force
,
sortings
1300
x8682
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x306
1784A
Monsters (easy version)
brute force
,
greedy
1000
x14567
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x2040
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4228
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1272
1781D
Many Perfect Squares
brute force
,
math
,
number theory
1800
x5300
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7140
1781B
Going to the Cinema
brute force
,
greedy
,
sortings
1000
x13289
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1396
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1318
1780B
GCD Partition
brute force
,
greedy
,
math
,
number theory
1100
x16778
1779H
Olympic Team Building
brute force
,
meet-in-the-middle
3500
x132
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x7746
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x19357
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x388
1774F2
Magician and Pigs (Hard Version)
binary search
,
brute force
,
data structures
,
implementation
2700
x645
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1025
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7475
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x458
1772B
Matrix Rotation
brute force
,
implementation
800
x28338
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x665
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2615
1770C
Koxia and Number Theory
brute force
,
chinese remainder theorem
,
math
,
number theory
1700
x8316
1770A
Koxia and Whiteboards
brute force
,
greedy
1000
x22975
1769D3
Игра в Девятку III
*special problem
,
brute force
2300
x118
1769D2
Игра в Девятку II
*special problem
,
brute force
2200
x189
1769D1
Игра в Девятку I
*special problem
,
brute force
,
dp
1800
x370
1769C1
Подкрутка I
*special problem
,
brute force
,
dp
,
greedy
1200
x933
1769B2
Копирование файлов II
*special problem
,
binary search
,
brute force
,
math
1400
x859
1769B1
Копирование файлов I
*special problem
,
brute force
,
implementation
,
math
1000
x1318
1767E
Algebra Flash
bitmasks
,
brute force
,
dp
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x847
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1141
1766A
Extremely Round
brute force
,
implementation
800
x24318
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x564
1765E
Exchange
brute force
,
math
1000
x9604
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x927
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