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Educational Codeforces Round 166 (Rated for Div. 2)
37:40:59
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Difficulty:
—
dp
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
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7384
1845C
Strong Password
binary search
,
dp
,
greedy
,
strings
1400
x13442
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x132
1844C
Particles
dp
,
greedy
,
implementation
,
math
1300
x14968
1843F2
Omsk Metro (hard version)
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
math
,
trees
2300
x1487
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x5023
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x17147
1842I
Tenzing and Necklace
divide and conquer
,
dp
,
greedy
3500
x108
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x565
1842G
Tenzing and Random Operations
combinatorics
,
dp
,
math
,
probabilities
2800
x931
1842E
Tenzing and Triangle
data structures
,
dp
,
geometry
,
greedy
,
math
2300
x1547
1842C
Tenzing and Balls
dp
1500
x11835
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7358
1840F
Railguns
brute force
,
dfs and similar
,
dp
,
graphs
2200
x1717
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1165
1839D
Ball Sorting
data structures
,
dp
,
sortings
2100
x2192
1838E
Count Supersequences
combinatorics
,
dp
,
math
2500
x1380
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x203
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4981
1832F
Zombies
binary search
,
dp
3200
x253
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2068
1830F
The Third Grace
data structures
,
dp
3200
x225
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x608
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12567
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7155
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x9528
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x24443
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1154
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1781
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3689
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1515
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x8715
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x1264
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x797
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x1201
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x5650
1821F
Timber
combinatorics
,
dp
,
fft
,
math
2600
x713
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2267
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x127
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x600
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1405
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x329
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x1059
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x1260
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1636
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x1930
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x11656
1810G
The Maximum Prefix
dp
3200
x641
1809G
Prediction
combinatorics
,
dp
,
math
2800
x421
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x796
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x422
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x654
1808E1
Minibuses on Venus (easy version)
combinatorics
,
divide and conquer
,
dp
2200
x1257
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x3603
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x17861
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x17960
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x855
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1534
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x6093
1804H
Code Lock
bitmasks
,
dp
3300
x169
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1372
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4443
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x549
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2070
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3248
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x272
1799G
Count Voting
combinatorics
,
dp
,
math
2600
x709
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x778
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2299
1799D1
Hot Start Up (easy version)
dp
1900
x4132
1798F
Gifts from Grandfather Ahmed
dp
,
math
,
number theory
2500
x468
1798E
Multitest Generator
brute force
,
dp
2300
x1534
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3724
1796E
Colored Subgraphs
dfs and similar
,
dp
,
games
,
greedy
,
trees
2500
x703
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x3920
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x1940
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1020
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3380
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x937
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5812
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x374
1792F1
Graph Coloring (easy version)
combinatorics
,
dp
,
graphs
2700
x676
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1316
1791E
Negatives and Positives
dp
,
greedy
,
sortings
1100
x25881
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
x772
1789C
Serval and Toxel's Arrays
combinatorics
,
dp
,
implementation
,
math
1500
x8143
1788E
Sum Over Zero
data structures
,
dfs and similar
,
dp
2200
x2497
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x202
1787C
Remove the Bracket
dp
,
greedy
,
math
1600
x6759
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x303
1784D
Wooden Spoon
combinatorics
,
dp
2400
x958
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4218
1781F
Bracket Insertion
combinatorics
,
dp
,
math
,
trees
2700
x741
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1391
1779F
Xorcerer's Stones
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x1225
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7558
1778F
Maximizing Root
dfs and similar
,
dp
,
graphs
,
math
,
number theory
,
trees
2600
x601
1778D
Flexible String Revisit
combinatorics
,
dp
,
math
,
probabilities
2100
x2576
1777D
Score of a Tree
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
math
,
probabilities
,
trees
1900
x3243
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