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Codeforces Round (Div. 2)
3 days
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Difficulty:
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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
466E
Information Graph
dfs and similar
,
dsu
,
graphs
,
trees
2100
x2103
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1579
461B
Appleman and Tree
dfs and similar
,
dp
,
trees
2000
x5420
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x105
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5526
455B
A Lot of Games
dfs and similar
,
dp
,
games
,
implementation
,
strings
,
trees
1900
x5765
452B
4-point polyline
brute force
,
constructive algorithms
,
geometry
,
trees
1800
x1987
444E
DZY Loves Planting
binary search
,
dsu
,
trees
2700
x748
442D
Adam and Tree
data structures
,
trees
2600
x967
440D
Berland Federalization
dp
,
trees
2200
x642
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2596
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x257
431C
k-Tree
dp
,
implementation
,
trees
1600
x24963
429C
Guess the Tree
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
trees
2300
x932
429A
Xor-tree
dfs and similar
,
trees
1300
x10095
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x472
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x676
406D
Hill Climbing
dfs and similar
,
geometry
,
trees
2200
x1133
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x203
396C
On Changing Tree
data structures
,
graphs
,
trees
x1549
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x6205
382D
Ksenia and Pawns
dfs and similar
,
graphs
,
implementation
,
trees
2200
x657
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x2173
375D
Tree and Queries
data structures
,
dfs and similar
,
trees
2400
x6343
374D
Inna and Sequence
binary search
,
data structures
,
dp
,
trees
2000
x852
372D
Choosing Subtree is Fun
binary search
,
data structures
,
dfs and similar
,
trees
,
two pointers
2600
x947
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5427
369C
Valera and Elections
dfs and similar
,
graphs
,
trees
1600
x9588
348E
Pilgrims
dfs and similar
,
dp
,
trees
2800
x430
348B
Apple Tree
dfs and similar
,
number theory
,
trees
2100
x2060
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x697
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5589
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x7835
339D
Xenia and Bit Operations
data structures
,
trees
1700
x24343
337E
Divisor Tree
brute force
,
number theory
,
trees
2200
x1011
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x5924
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x175
321C
Ciel the Commander
constructive algorithms
,
dfs and similar
,
divide and conquer
,
greedy
,
trees
2100
x6955
317C
Balance
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x491
294E
Shaass the Great
dp
,
trees
2300
x918
293E
Close Vertices
data structures
,
divide and conquer
,
trees
2700
x1327
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1527
288D
Polo the Penguin and Trees
combinatorics
,
dfs and similar
,
trees
2400
x679
282E
Sausage Maximization
bitmasks
,
data structures
,
trees
2200
x3491
280C
Game on Tree
implementation
,
math
,
probabilities
,
trees
2200
x3621
277E
Binary Tree on Plane
flows
,
trees
2400
x1248
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1569
274B
Zero Tree
dfs and similar
,
dp
,
greedy
,
trees
1800
x4928
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1375
258E
Little Elephant and Tree
data structures
,
dfs and similar
,
trees
2400
x1043
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x169
238C
World Eater Brothers
dfs and similar
,
dp
,
greedy
,
trees
2100
x1092
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x549
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1628
226E
Noble Knight's Path
data structures
,
trees
2900
x450
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x8863
217E
Alien DNA
data structures
,
dsu
,
trees
2800
x296
212E
IT Restaurants
dfs and similar
,
dp
,
trees
1500
x1688
208E
Blood Cousins
binary search
,
data structures
,
dfs and similar
,
trees
2100
x6256
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x798
193A
Cutting Figure
constructive algorithms
,
graphs
,
trees
1700
x3879
191E
Thwarting Demonstrations
binary search
,
data structures
,
trees
2200
x817
191C
Fools and Roads
data structures
,
dfs and similar
,
trees
1900
x6910
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x1086
165D
Beard Graph
data structures
,
dsu
,
trees
2100
x1602
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1549
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x13968
152E
Garden
bitmasks
,
dp
,
graphs
,
trees
2500
x466
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x814
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x698
120F
Spiders
dp
,
greedy
,
trees
1400
x3529
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x317
115A
Party
dfs and similar
,
graphs
,
trees
900
x33412
109C
Lucky Tree
dp
,
dsu
,
trees
1900
x3243
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x672
98B
Help King
implementation
,
probabilities
,
trees
2200
x117
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x374
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x861
86C
Genetic engineering
dp
,
string suffix structures
,
trees
2500
x689
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x523
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x331
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x982
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1538
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1755
70E
Information Reform
dp
,
implementation
,
trees
2700
x481
61E
Enemy is weak
data structures
,
trees
1900
x10435
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6333
51F
Caterpillar
dfs and similar
,
dp
,
graphs
,
trees
2800
x551
48G
Galaxy Union
dp
,
trees
,
two pointers
2700
x255
42E
Baldman and the military
dfs and similar
,
graphs
,
trees
2700
x197
37C
Old Berland Language
data structures
,
greedy
,
trees
1900
x1603
29D
Ant on the Tree
constructive algorithms
,
dfs and similar
,
trees
2000
x2364
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x10696
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1568
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4373
6E
Exposition
binary search
,
data structures
,
dsu
,
trees
,
two pointers
1900
x3175
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