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Codeforces Round 945 (Div. 2)
2 days
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Difficulty:
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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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Status
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Custom test
Problems
#
Name
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x5819
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21728
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x21372
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x22386
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2277
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11363
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x15899
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x328
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1196
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3701
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x3895
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x1919
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x11461
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1009
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1284
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x932
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18194
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5896
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x11538
1790D
Matryoshkas
data structures
,
greedy
,
sortings
1200
x18221
1788E
Sum Over Zero
data structures
,
dfs and similar
,
dp
2200
x2476
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x148
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x201
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x396
1784C
Monsters (hard version)
data structures
,
greedy
2200
x1530
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x409
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x2033
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1266
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1375
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1307
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7514
1779C
Least Prefix Sum
data structures
,
greedy
1600
x11840
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x818
1776E
Crossing the Railways
data structures
,
dp
3500
x62
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x366
1774F2
Magician and Pigs (Hard Version)
binary search
,
brute force
,
data structures
,
implementation
2700
x643
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1022
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x968
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2602
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3676
1767F
Two Subtrees
data structures
,
trees
3100
x246
1767C
Count Binary Strings
data structures
,
dp
2100
x2522
1767B
Block Towers
data structures
,
greedy
,
sortings
800
x19579
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1131
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x563
1764H
Doremy's Paint 2
data structures
3400
x166
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x418
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x13925
1762F
Good Pairs
binary search
,
data structures
,
dp
2600
x561
1760E
Binary Inversions
data structures
,
greedy
,
math
1100
x19302
1760C
Advantage
data structures
,
implementation
,
sortings
800
x35127
1759G
Restore the Permutation
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
1900
x4234
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x3711
1758F
Decent Division
constructive algorithms
,
data structures
3000
x154
1750H
BinaryStringForces
constructive algorithms
,
data structures
,
dp
3500
x72
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1361
1749F
Distance to the Path
data structures
,
dfs and similar
,
trees
2800
x471
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x13395
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1735
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x10462
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x4491
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x88
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x1521
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x244
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1413
1741F
Multi-Colored Segments
binary search
,
data structures
,
math
,
sortings
2000
x2233
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x104
1740H
MEX Tree Manipulation
data structures
,
trees
3300
x201
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4114
1740D
Knowledge Cards
constructive algorithms
,
data structures
1500
x7711
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x513
1739D
Reset K Edges
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x4881
1738H
Palindrome Addicts
data structures
,
strings
3300
x227
1738D
Permutation Addicts
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
1900
x3327
1737G
Ela Takes Dancing Class
binary search
,
data structures
3500
x108
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1241
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14535
1735F
Pebbles and Beads
data structures
,
geometry
2900
x218
1735E
House Planning
constructive algorithms
,
data structures
,
graph matchings
,
greedy
2400
x1022
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5284
1734D
Slime Escape
data structures
,
dp
,
greedy
,
two pointers
1800
x6031
1732E
Location
data structures
,
dp
,
math
,
number theory
2800
x414
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1365
1732D1
Balance (Easy version)
brute force
,
data structures
,
implementation
,
number theory
1500
x8282
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x6731
1730F
Almost Sorted
bitmasks
,
data structures
,
dp
2700
x411
1730E
Maximums and Minimums
combinatorics
,
data structures
,
divide and conquer
,
number theory
2700
x615
1730C
Minimum Notation
data structures
,
greedy
,
math
,
sortings
1200
x16068
1730A
Planets
data structures
,
greedy
,
sortings
800
x22534
1728E
Red-Black Pepper
brute force
,
data structures
,
greedy
,
math
,
number theory
2300
x1651
1728C
Digital Logarithm
data structures
,
greedy
,
sortings
1400
x15215
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x282
1726F
Late For Work (submissions are not allowed)
data structures
,
greedy
,
schedules
,
shortest paths
2900
x131
1726C
Jatayu's Balanced Bracket Sequence
data structures
,
dsu
,
graphs
,
greedy
1300
x12079
1725L
Lemper Cooking Competition
data structures
2400
x876
1725K
Kingdom of Criticism
data structures
,
dsu
2500
x580
1725F
Field Photography
bitmasks
,
data structures
,
sortings
2100
x938
1725E
Electrical Efficiency
combinatorics
,
data structures
,
dp
,
math
,
number theory
,
trees
2500
x432
1722E
Counting Rectangles
brute force
,
data structures
,
dp
,
implementation
1600
x10082
1722C
Word Game
data structures
,
implementation
800
x29540
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