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Codeforces Round (Div. 2)
4 days
→ Filter Problems
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
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x2650
1832F
Zombies
binary search
,
dp
3200
x151
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x1414
1830F
The Third Grace
data structures
,
dp
x17
1830D
Mex Tree
brute force
,
dp
,
trees
x171
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
implementation
,
trees
x6834
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x3877
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x5380
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x15683
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x644
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1093
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x2495
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1034
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x4735
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x791
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x445
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x888
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x3373
1821F
Timber
combinatorics
,
dp
,
fft
,
math
2600
x485
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x1540
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x82
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x440
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1027
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x170
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x697
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x878
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1082
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x1313
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x8190
1810G
The Maximum Prefix
dp
3200
x222
1809G
Prediction
combinatorics
,
dp
,
math
2800
x257
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x600
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x265
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x434
1808E1
Minibuses on Venus (easy version)
combinatorics
,
divide and conquer
,
dp
2200
x874
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x2714
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x13863
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x14366
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x631
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1123
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x4366
1804H
Code Lock
bitmasks
,
dp
3300
x111
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1131
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x3687
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x396
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x1394
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x2307
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x173
1799G
Count Voting
combinatorics
,
dp
,
math
2600
x497
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x588
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x1755
1799D1
Hot Start Up (easy version)
dp
1900
x3019
1798F
Gifts from Grandfather Ahmed
dp
,
math
,
number theory
2500
x334
1798E
Multitest Generator
brute force
,
dp
2300
x1188
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x2646
1796E
Colored Subgraphs
dfs and similar
,
dp
,
games
,
greedy
,
trees
2500
x503
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x2833
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x1576
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x749
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x2658
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x716
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x4624
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x297
1792F1
Graph Coloring (easy version)
combinatorics
,
dp
,
graphs
2700
x507
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1053
1791E
Negatives and Positives
dp
,
greedy
,
sortings
1100
x19852
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x358
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x627
1789C
Serval and Toxel's Arrays
combinatorics
,
dp
,
implementation
,
math
1500
x6417
1788E
Sum Over Zero
data structures
,
dfs and similar
,
dp
2200
x1945
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x146
1787C
Remove the Bracket
dp
,
greedy
,
math
1600
x5447
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x207
1784D
Wooden Spoon
combinatorics
,
dp
2400
x732
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x3446
1781F
Bracket Insertion
combinatorics
,
dp
,
math
,
trees
2700
x581
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1068
1779F
Xorcerer's Stones
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x1047
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x6174
1778F
Maximizing Root
dfs and similar
,
dp
,
graphs
,
math
,
number theory
,
trees
2600
x427
1778D
Flexible String Revisit
combinatorics
,
dp
,
math
,
probabilities
2100
x2060
1777D
Score of a Tree
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
math
,
probabilities
,
trees
1900
x2493
1776M
Parmigiana With Seafood
binary search
,
dp
,
greedy
,
trees
3000
x221
1776K
Uniform Chemistry
dp
,
math
3200
x45
1776E
Crossing the Railways
data structures
,
dp
3500
x26
1776B
Vittorio Plays with LEGO Bricks
dp
,
geometry
2200
x971
1775F
Laboratory on Pluto
constructive algorithms
,
dp
,
greedy
,
math
2500
x627
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x230
1774E
Two Chess Pieces
dfs and similar
,
dp
,
greedy
,
trees
1900
x2771
1774C
Ice and Fire
constructive algorithms
,
dp
,
greedy
1300
x9966
1773L
Lisa's Sequences
dp
3500
x20
1773G
Game of Questions
bitmasks
,
combinatorics
,
dp
,
fft
,
math
,
probabilities
2800
x214
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x564
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2118
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x10028
1770F
Koxia and Sequence
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
3100
x410
1770E
Koxia and Tree
combinatorics
,
dfs and similar
,
dp
,
dsu
,
math
,
probabilities
,
trees
2400
x1135
1769D1
Игра в Девятку I
*special problem
,
brute force
,
dp
1800
x328
1769C2
Подкрутка II
*special problem
,
dp
1300
x746
1769C1
Подкрутка I
*special problem
,
brute force
,
dp
,
greedy
1200
x780
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