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Before contest
Codeforces Round 941 (Div. 1)
03:51:50
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Before contest
Codeforces Round 941 (Div. 2)
03:51:50
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trees
combine-tags-by-or
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2-sat
binary search
bitmasks
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data structures
dfs and similar
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expression parsing
fft
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games
geometry
graph matchings
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implementation
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Problems
#
Name
396C
On Changing Tree
data structures
,
graphs
,
trees
x1519
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x6075
382D
Ksenia and Pawns
dfs and similar
,
graphs
,
implementation
,
trees
2200
x650
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x2111
375D
Tree and Queries
data structures
,
dfs and similar
,
trees
2400
x6172
374D
Inna and Sequence
binary search
,
data structures
,
dp
,
trees
2000
x843
372D
Choosing Subtree is Fun
binary search
,
data structures
,
dfs and similar
,
trees
,
two pointers
2600
x906
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5303
369C
Valera and Elections
dfs and similar
,
graphs
,
trees
1600
x9376
348E
Pilgrims
dfs and similar
,
dp
,
trees
2800
x426
348B
Apple Tree
dfs and similar
,
number theory
,
trees
2100
x2039
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x670
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5408
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x7595
339D
Xenia and Bit Operations
data structures
,
trees
1700
x23557
337E
Divisor Tree
brute force
,
number theory
,
trees
2200
x1003
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x5775
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x168
321C
Ciel the Commander
constructive algorithms
,
dfs and similar
,
divide and conquer
,
greedy
,
trees
2100
x6762
317C
Balance
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x490
294E
Shaass the Great
dp
,
trees
2300
x889
293E
Close Vertices
data structures
,
divide and conquer
,
trees
2700
x1265
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1515
288D
Polo the Penguin and Trees
combinatorics
,
dfs and similar
,
trees
2400
x671
282E
Sausage Maximization
bitmasks
,
data structures
,
trees
2200
x3341
280C
Game on Tree
implementation
,
math
,
probabilities
,
trees
2200
x3463
277E
Binary Tree on Plane
flows
,
trees
2400
x1232
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1540
274B
Zero Tree
dfs and similar
,
dp
,
greedy
,
trees
1800
x4884
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1310
258E
Little Elephant and Tree
data structures
,
dfs and similar
,
trees
2400
x1026
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x168
238C
World Eater Brothers
dfs and similar
,
dp
,
greedy
,
trees
2100
x1018
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x542
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1536
226E
Noble Knight's Path
data structures
,
trees
2900
x431
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x8534
217E
Alien DNA
data structures
,
dsu
,
trees
2800
x290
212E
IT Restaurants
dfs and similar
,
dp
,
trees
1500
x1656
208E
Blood Cousins
binary search
,
data structures
,
dfs and similar
,
trees
2100
x6053
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x738
193A
Cutting Figure
constructive algorithms
,
graphs
,
trees
1700
x3825
191E
Thwarting Demonstrations
binary search
,
data structures
,
trees
2200
x805
191C
Fools and Roads
data structures
,
dfs and similar
,
trees
1900
x6706
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x1019
165D
Beard Graph
data structures
,
dsu
,
trees
2100
x1582
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1520
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x13518
152E
Garden
bitmasks
,
dp
,
graphs
,
trees
2500
x459
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x786
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x689
120F
Spiders
dp
,
greedy
,
trees
1400
x3503
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x307
115A
Party
dfs and similar
,
graphs
,
trees
900
x32738
109C
Lucky Tree
dp
,
dsu
,
trees
1900
x3183
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x671
98B
Help King
implementation
,
probabilities
,
trees
2200
x114
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x370
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x845
86C
Genetic engineering
dp
,
string suffix structures
,
trees
2500
x680
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x521
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x325
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x977
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1438
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1715
70E
Information Reform
dp
,
implementation
,
trees
2700
x476
61E
Enemy is weak
data structures
,
trees
1900
x10023
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6233
51F
Caterpillar
dfs and similar
,
dp
,
graphs
,
trees
2800
x545
48G
Galaxy Union
dp
,
trees
,
two pointers
2700
x254
42E
Baldman and the military
dfs and similar
,
graphs
,
trees
2700
x187
37C
Old Berland Language
data structures
,
greedy
,
trees
1900
x1491
29D
Ant on the Tree
constructive algorithms
,
dfs and similar
,
trees
2000
x2294
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x10307
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1531
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4294
6E
Exposition
binary search
,
data structures
,
dsu
,
trees
,
two pointers
1900
x2989
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