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Before contest
Codeforces Round 941 (Div. 1)
4 days
Before contest
Codeforces Round 941 (Div. 2)
4 days
→ Filter Problems
Difficulty:
—
trees
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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Custom test
Problems
#
Name
533B
Work Group
dfs and similar
,
dp
,
graphs
,
strings
,
trees
2000
x2297
29D
Ant on the Tree
constructive algorithms
,
dfs and similar
,
trees
2000
x2290
615C
Running Track
dp
,
greedy
,
strings
,
trees
2000
x2251
814D
An overnight dance in discotheque
dfs and similar
,
dp
,
geometry
,
greedy
,
trees
2000
x2124
855C
Helga Hufflepuff's Cup
dp
,
trees
2000
x1973
761E
Dasha and Puzzle
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2000
x1889
681D
Gifts by the List
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2000
x1715
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1715
1092E
Minimal Diameter Forest
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2000
x1614
374D
Inna and Sequence
binary search
,
data structures
,
dp
,
trees
2000
x843
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x542
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x154
1919H
Tree Diameter
interactive
,
trees
2000
x126
1187E
Tree Painting
dfs and similar
,
dp
,
trees
2100
x7383
609E
Minimum spanning tree for each edge
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x6897
321C
Ciel the Commander
constructive algorithms
,
dfs and similar
,
divide and conquer
,
greedy
,
trees
2100
x6727
519E
A and B and Lecture Rooms
binary search
,
data structures
,
dfs and similar
,
dp
,
trees
2100
x6159
208E
Blood Cousins
binary search
,
data structures
,
dfs and similar
,
trees
2100
x6035
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5389
620E
New Year Tree
bitmasks
,
data structures
,
trees
2100
x5152
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5115
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5111
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x4009
1000E
We Need More Bosses
dfs and similar
,
graphs
,
trees
2100
x3901
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3851
486D
Valid Sets
dfs and similar
,
dp
,
math
,
trees
2100
x3849
734E
Anton and Tree
dfs and similar
,
dp
,
trees
2100
x3732
1278D
Segment Tree
data structures
,
dsu
,
graphs
,
trees
2100
x3702
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3559
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3381
1025D
Recovering BST
brute force
,
dp
,
math
,
number theory
,
trees
2100
x3294
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3126
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x2849
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2830
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x2802
771C
Bear and Tree Jumps
dfs and similar
,
dp
,
trees
2100
x2785
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2772
1547G
How Many Paths?
dfs and similar
,
dp
,
graphs
,
trees
2100
x2766
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2663
1296F
Berland Beauty
constructive algorithms
,
dfs and similar
,
greedy
,
sortings
,
trees
2100
x2663
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2636
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2580
1223E
Paint the Tree
dp
,
sortings
,
trees
2100
x2512
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2458
1152D
Neko and Aki's Prank
dp
,
greedy
,
trees
2100
x2241
466E
Information Graph
dfs and similar
,
dsu
,
graphs
,
trees
2100
x2052
348B
Apple Tree
dfs and similar
,
number theory
,
trees
2100
x2037
540E
Infinite Inversions
binary search
,
data structures
,
implementation
,
sortings
,
trees
2100
x2004
960D
Full Binary Tree Queries
brute force
,
implementation
,
trees
2100
x1676
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1647
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1638
165D
Beard Graph
data structures
,
dsu
,
trees
2100
x1579
576B
Invariance of Tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2100
x1572
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1539
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1532
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1382
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1309
746G
New Roads
constructive algorithms
,
graphs
,
trees
2100
x1306
1387B1
Village (Minimum)
*special problem
,
dp
,
greedy
,
trees
2100
x1299
1666J
Job Lookup
constructive algorithms
,
dp
,
shortest paths
,
trees
2100
x1290
238C
World Eater Brothers
dfs and similar
,
dp
,
greedy
,
trees
2100
x1018
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x977
1184E2
Daleks' Invasion (medium)
dfs and similar
,
graphs
,
shortest paths
,
trees
2100
x895
859D
Third Month Insanity
dp
,
probabilities
,
trees
2100
x847
838B
Diverging Directions
data structures
,
dfs and similar
,
trees
2100
x693
802K
Send the Fool Further! (medium)
dp
,
trees
2100
x577
570D
Tree Requests
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2200
x6612
587C
Duff in the Army
data structures
,
trees
2200
x3671
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3531
280C
Game on Tree
implementation
,
math
,
probabilities
,
trees
2200
x3452
282E
Sausage Maximization
bitmasks
,
data structures
,
trees
2200
x3341
1656E
Equal Tree Sums
constructive algorithms
,
dfs and similar
,
math
,
trees
2200
x3275
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3173
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2670
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2625
1220E
Tourism
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2200
x2540
592D
Super M
dfs and similar
,
dp
,
graphs
,
trees
2200
x2353
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2206
1583E
Moment of Bloom
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
,
trees
2200
x2158
1311E
Construct the Binary Tree
brute force
,
constructive algorithms
,
trees
2200
x2112
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2088
1249F
Maximum Weight Subset
dp
,
trees
2200
x2081
1695D1
Tree Queries (Easy Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2200
x2078
1181D
Irrigation
binary search
,
data structures
,
implementation
,
sortings
,
trees
,
two pointers
2200
x2016
622E
Ants in Leaves
dfs and similar
,
greedy
,
sortings
,
trees
2200
x1970
1179C
Serge and Dining Room
binary search
,
data structures
,
graph matchings
,
greedy
,
implementation
,
math
,
trees
2200
x1945
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1914
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1833
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1801
980E
The Number Games
data structures
,
greedy
,
trees
2200
x1795
1551F
Equidistant Vertices
brute force
,
combinatorics
,
dfs and similar
,
dp
,
trees
2200
x1738
1278E
Tests for problem D
constructive algorithms
,
dfs and similar
,
divide and conquer
,
trees
2200
x1722
618D
Hamiltonian Spanning Tree
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
2200
x1684
1238F
The Maximum Subtree
dfs and similar
,
dp
,
graphs
,
trees
2200
x1683
1777E
Edge Reverse
binary search
,
dfs and similar
,
graphs
,
trees
2200
x1679
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1679
1670E
Hemose on the Tree
bitmasks
,
constructive algorithms
,
dfs and similar
,
trees
2200
x1660
932D
Tree
binary search
,
dp
,
trees
2200
x1638
1283F
DIY Garland
constructive algorithms
,
greedy
,
trees
2200
x1635
490F
Treeland Tour
data structures
,
dfs and similar
,
dp
,
trees
2200
x1546
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