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Codeforces Round 941 (Div. 1)
2 days
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Before contest
Codeforces Round 941 (Div. 2)
2 days
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data structures
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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
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number theory
probabilities
schedules
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sortings
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ternary search
trees
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Problems
#
Name
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3680
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x3853
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x1903
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x11326
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1003
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1270
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x923
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18011
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5857
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x11396
1790D
Matryoshkas
data structures
,
greedy
,
sortings
1200
x18051
1788E
Sum Over Zero
data structures
,
dfs and similar
,
dp
2200
x2454
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x147
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x197
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x394
1784C
Monsters (hard version)
data structures
,
greedy
2200
x1514
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x405
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x2015
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1261
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1366
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1297
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7451
1779C
Least Prefix Sum
data structures
,
greedy
1600
x11758
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x811
1776E
Crossing the Railways
data structures
,
dp
3500
x61
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x363
1774F2
Magician and Pigs (Hard Version)
binary search
,
brute force
,
data structures
,
implementation
2700
x636
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1017
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x953
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2584
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3653
1767F
Two Subtrees
data structures
,
trees
3100
x245
1767C
Count Binary Strings
data structures
,
dp
2100
x2491
1767B
Block Towers
data structures
,
greedy
,
sortings
800
x19548
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1123
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x559
1764H
Doremy's Paint 2
data structures
3400
x162
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x417
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x13854
1762F
Good Pairs
binary search
,
data structures
,
dp
2600
x558
1760E
Binary Inversions
data structures
,
greedy
,
math
1100
x19104
1760C
Advantage
data structures
,
implementation
,
sortings
800
x34801
1759G
Restore the Permutation
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
1900
x4200
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x3674
1758F
Decent Division
constructive algorithms
,
data structures
3000
x152
1750H
BinaryStringForces
constructive algorithms
,
data structures
,
dp
3500
x72
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1352
1749F
Distance to the Path
data structures
,
dfs and similar
,
trees
2800
x467
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x13250
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1695
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x10386
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x4462
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x88
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x1495
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x244
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1406
1741F
Multi-Colored Segments
binary search
,
data structures
,
math
,
sortings
2000
x2211
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
x4092
1740D
Knowledge Cards
constructive algorithms
,
data structures
1500
x7665
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x508
1739D
Reset K Edges
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x4848
1738H
Palindrome Addicts
data structures
,
strings
3300
x227
1738D
Permutation Addicts
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
1900
x3312
1737G
Ela Takes Dancing Class
binary search
,
data structures
3500
x108
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1229
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14451
1735F
Pebbles and Beads
data structures
,
geometry
2900
x218
1735E
House Planning
constructive algorithms
,
data structures
,
graph matchings
,
greedy
2400
x1021
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5262
1734D
Slime Escape
data structures
,
dp
,
greedy
,
two pointers
1800
x5998
1732E
Location
data structures
,
dp
,
math
,
number theory
2800
x404
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1358
1732D1
Balance (Easy version)
brute force
,
data structures
,
implementation
,
number theory
1500
x8221
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x6676
1730F
Almost Sorted
bitmasks
,
data structures
,
dp
2700
x409
1730E
Maximums and Minimums
combinatorics
,
data structures
,
divide and conquer
,
number theory
2700
x609
1730C
Minimum Notation
data structures
,
greedy
,
math
,
sortings
1200
x16015
1730A
Planets
data structures
,
greedy
,
sortings
800
x22476
1728E
Red-Black Pepper
brute force
,
data structures
,
greedy
,
math
,
number theory
2300
x1645
1728C
Digital Logarithm
data structures
,
greedy
,
sortings
1400
x15027
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
x11844
1725L
Lemper Cooking Competition
data structures
2400
x862
1725K
Kingdom of Criticism
data structures
,
dsu
2500
x575
1725F
Field Photography
bitmasks
,
data structures
,
sortings
2100
x933
1725E
Electrical Efficiency
combinatorics
,
data structures
,
dp
,
math
,
number theory
,
trees
2500
x432
1722E
Counting Rectangles
brute force
,
data structures
,
dp
,
implementation
1600
x9981
1722C
Word Game
data structures
,
implementation
800
x29275
1720E
Misha and Paintings
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
2700
x734
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1723
1720B
Interesting Sum
brute force
,
data structures
,
greedy
,
math
,
sortings
800
x20725
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x12839
1718F
Burenka, an Array and Queries
data structures
,
math
,
number theory
3300
x145
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x286
1718C
Tonya and Burenka-179
data structures
,
greedy
,
math
,
number theory
2400
x1509
1718A2
Burenka and Traditions (hard version)
data structures
,
dp
,
greedy
1900
x4972
1716E
Swap and Maximum Block
bitmasks
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
2500
x1018
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