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Codeforces Round (Div. 3)
6 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
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6643
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x128
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x604
1817A
Almost Increasing Subsequence
binary search
,
data structures
,
greedy
1500
x10544
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x1270
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x832
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1665
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x549
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x3051
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x722
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2211
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x18106
1807D
Odd Queries
data structures
,
implementation
900
x29619
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2715
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1546
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x12159
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x194
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x354
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x436
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2092
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3274
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x5920
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x22063
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x21580
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x22609
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2319
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11418
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x16063
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x336
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1206
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3749
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x4050
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x1946
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x11710
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1027
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1309
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x946
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18662
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5978
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x11732
1790D
Matryoshkas
data structures
,
greedy
,
sortings
1200
x18669
1788E
Sum Over Zero
data structures
,
dfs and similar
,
dp
2200
x2506
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x149
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x203
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x401
1784C
Monsters (hard version)
data structures
,
greedy
2200
x1545
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x421
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x2044
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1273
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1402
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1325
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7602
1779C
Least Prefix Sum
data structures
,
greedy
1600
x11983
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x835
1776E
Crossing the Railways
data structures
,
dp
3500
x63
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x399
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
x1026
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x991
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2631
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3700
1767F
Two Subtrees
data structures
,
trees
3100
x255
1767C
Count Binary Strings
data structures
,
dp
2100
x2548
1767B
Block Towers
data structures
,
greedy
,
sortings
800
x19831
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1148
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x564
1764H
Doremy's Paint 2
data structures
3400
x171
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x427
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x14171
1762F
Good Pairs
binary search
,
data structures
,
dp
2600
x569
1760E
Binary Inversions
data structures
,
greedy
,
math
1100
x19565
1760C
Advantage
data structures
,
implementation
,
sortings
800
x35597
1759G
Restore the Permutation
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
1900
x4306
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x3767
1758F
Decent Division
constructive algorithms
,
data structures
3000
x161
1750H
BinaryStringForces
constructive algorithms
,
data structures
,
dp
3500
x74
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1370
1749F
Distance to the Path
data structures
,
dfs and similar
,
trees
2800
x482
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x13566
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1754
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x10654
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x4536
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x90
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x1591
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x248
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1437
1741F
Multi-Colored Segments
binary search
,
data structures
,
math
,
sortings
2000
x2264
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x107
1740H
MEX Tree Manipulation
data structures
,
trees
3300
x206
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4170
1740D
Knowledge Cards
constructive algorithms
,
data structures
1500
x7806
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x516
1739D
Reset K Edges
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x4944
1738H
Palindrome Addicts
data structures
,
strings
3300
x232
1738D
Permutation Addicts
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
1900
x3364
1737G
Ela Takes Dancing Class
binary search
,
data structures
3500
x110
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1250
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14663
1735F
Pebbles and Beads
data structures
,
geometry
2900
x219
1735E
House Planning
constructive algorithms
,
data structures
,
graph matchings
,
greedy
2400
x1027
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