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Codeforces Round (Div. 2)
4 days
→ Filter Problems
Difficulty:
—
data structures
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
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
x1128
1837D
Bracket Coloring
constructive algorithms
,
data structures
,
greedy
x8561
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x3946
1830F
The Third Grace
data structures
,
dp
x16
1830E
Bully Sort
data structures
x30
1830C
Hyperregular Bracket Strings
combinatorics
,
data structures
,
hashing
,
number theory
,
sortings
x613
1830B
The BOSS Can Count Pairs
brute force
,
data structures
,
math
x2016
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x5374
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x53
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x367
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x645
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1091
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1035
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x78
1824D
LuoTianyi and the Function
data structures
3000
x251
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x790
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x1530
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x4235
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x82
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x440
1817A
Almost Increasing Subsequence
binary search
,
data structures
,
greedy
1500
x7195
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x878
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x604
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1080
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x398
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x2228
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x544
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x1662
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x14365
1807D
Odd Queries
data structures
,
implementation
900
x20691
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2000
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1123
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x9404
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x140
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x128
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x261
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x1393
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x2307
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x4405
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x15836
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x16870
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x17875
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x1754
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x10268
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x13360
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x185
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x851
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x2645
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x2832
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x1576
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x9053
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x749
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x993
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x716
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x13392
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x4854
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x8631
1790D
Matryoshkas
data structures
,
greedy
,
sortings
1200
x14052
1788E
Sum Over Zero
data structures
,
dfs and similar
,
dp
2200
x1945
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x110
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x146
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x282
1784C
Monsters (hard version)
data structures
,
greedy
2200
x1254
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x328
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x1712
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1167
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1068
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1055
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x6174
1779C
Least Prefix Sum
data structures
,
greedy
1600
x9844
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x596
1776E
Crossing the Railways
data structures
,
dp
3500
x26
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x230
1774F2
Magician and Pigs (Hard Version)
binary search
,
brute force
,
data structures
,
implementation
2700
x498
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x882
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x673
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2118
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3202
1767F
Two Subtrees
data structures
,
trees
3100
x114
1767C
Count Binary Strings
data structures
,
dp
2100
x2069
1767B
Block Towers
data structures
,
greedy
,
sortings
800
x17858
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x980
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x460
1764H
Doremy's Paint 2
data structures
3400
x113
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x273
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x11567
1762F
Good Pairs
binary search
,
data structures
,
dp
2600
x342
1760E
Binary Inversions
data structures
,
greedy
,
math
1100
x15709
1760C
Advantage
data structures
,
implementation
,
sortings
800
x28786
1759G
Restore the Permutation
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
1900
x3461
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x2933
1758F
Decent Division
constructive algorithms
,
data structures
3000
x120
1750H
BinaryStringForces
constructive algorithms
,
data structures
,
dp
3500
x57
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1148
1749F
Distance to the Path
data structures
,
dfs and similar
,
trees
2800
x398
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x11268
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1374
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x8462
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x3882
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x78
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