Enter
|
Register
Home
Top
Catalog
Contests
Gym
Problemset
Groups
Rating
Edu
API
Calendar
Help
→ Pay attention
Before contest
Codeforces Round (Div. 2)
5 days
Register now »
*has extra registration
→ Filter Problems
Difficulty:
—
dfs and similar
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
Add tag
Main
acmsguru
|
Problems
Submit
Status
Standings
Custom test
Problems
#
Name
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x17390
1842F
Tenzing and Tree
dfs and similar
,
greedy
,
shortest paths
,
sortings
,
trees
2500
x1265
1840F
Railguns
brute force
,
dfs and similar
,
dp
,
graphs
2200
x1731
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1180
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x157
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x458
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x5102
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10946
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12837
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x16651
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x18938
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x25021
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x370
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x717
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x1275
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2525
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x5772
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x3949
1815C
Between
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2200
x1912
1811F
Is It Flower?
dfs and similar
,
graphs
,
implementation
2100
x1765
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x3064
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x6025
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2732
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1550
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x6250
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1381
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1973
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12327
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x275
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1171
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x337
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3785
1796E
Colored Subgraphs
dfs and similar
,
dp
,
games
,
greedy
,
trees
2500
x720
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x660
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1077
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1330
1790G
Tokens on Graph
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2300
x1084
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3203
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x809
1788E
Sum Over Zero
data structures
,
dfs and similar
,
dp
2200
x2535
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3321
1783F
Double Sort II
dfs and similar
,
flows
,
graph matchings
,
graphs
2500
x985
1778F
Maximizing Root
dfs and similar
,
dp
,
graphs
,
math
,
number theory
,
trees
2600
x610
1778E
The Tree Has Fallen!
bitmasks
,
dfs and similar
,
math
,
trees
2500
x840
1777E
Edge Reverse
binary search
,
dfs and similar
,
graphs
,
trees
2200
x1727
1777D
Score of a Tree
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
math
,
probabilities
,
trees
1900
x3308
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x5961
1774E
Two Chess Pieces
dfs and similar
,
dp
,
greedy
,
trees
1900
x3386
1772F
Copy of a Copy of a Copy
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
sortings
2000
x2277
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2642
1770E
Koxia and Tree
combinatorics
,
dfs and similar
,
dp
,
dsu
,
math
,
probabilities
,
trees
2400
x1313
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3722
1768D
Lucky Permutation
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1800
x6847
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x935
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x433
1761C
Set Construction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1400
x9301
1760G
SlavicG's Favorite Problem
bitmasks
,
dfs and similar
,
graphs
1700
x7083
1758E
Tick, Tock
combinatorics
,
dfs and similar
,
dsu
,
graphs
2500
x808
1753D
The Beach
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1690
1749F
Distance to the Path
data structures
,
dfs and similar
,
trees
2800
x488
1749E
Cactus Wall
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1644
1746D
Paths on the Tree
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1900
x4506
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1447
1741D
Masha and a Beautiful Tree
dfs and similar
,
divide and conquer
,
graphs
,
sortings
,
trees
1300
x14755
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4193
1739D
Reset K Edges
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x4968
1738D
Permutation Addicts
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
1900
x3380
1735C
Phase Shift
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
1400
x9686
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3592
1722F
L-shapes
dfs and similar
,
implementation
1700
x6677
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x372
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1846
1721D
Maximum AND
bitmasks
,
dfs and similar
,
divide and conquer
,
greedy
,
sortings
1800
x6444
1716E
Swap and Maximum Block
bitmasks
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
2500
x1032
1714G
Path Prefixes
binary search
,
data structures
,
dfs and similar
,
trees
1700
x7318
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x307
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2505
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x592
1707C
DFS Trees
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1408
1706E
Qpwoeirut and Vertices
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
trees
2300
x2438
1702G2
Passable Paths (hard version)
data structures
,
dfs and similar
,
trees
2000
x4433
1702G1
Passable Paths (easy version)
dfs and similar
,
trees
1900
x5227
1702E
Split Into Two Sets
dfs and similar
,
dsu
,
graphs
1600
x12699
1696F
Tree Recovery
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x857
1695E
Ambiguous Dominoes
constructive algorithms
,
dfs and similar
,
graphs
2700
x429
1695D2
Tree Queries (Hard Version)
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1940
1695D1
Tree Queries (Easy Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2200
x2117
1693B
Fake Plastic Trees
dfs and similar
,
dp
,
greedy
,
trees
1700
x8193
1691F
K-Set Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2500
x931
1691E
Number of Groups
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2300
x1767
1689E
ANDfinity
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1173
1689C
Infected Tree
dfs and similar
,
dp
,
trees
1600
x10843
1685D1
Permutation Weight (Easy Version)
constructive algorithms
,
dfs and similar
,
dsu
2800
x433
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x236
1682E
Unordered Swaps
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
,
trees
2700
x571
1681F
Unique Occurrences
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2300
x1609
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x9411
1680F
Lenient Vertex Cover
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x639
1679D
Toss a Coin to Your Graph...
binary search
,
dfs and similar
,
dp
,
graphs
1900
x4645
1677C
Tokitsukaze and Two Colorful Tapes
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1900
x3483
←
1
2
3
4
...
9
10
→
User lists
Name