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Codeforces Round (Div. 2)
3 days
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Difficulty:
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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
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Problems
#
Name
331D1
Escaping on Beaveractor
dfs and similar
,
implementation
2400
x202
329B
Biridian Forest
dfs and similar
,
shortest paths
1500
x6186
327D
Block Tower
constructive algorithms
,
dfs and similar
,
graphs
1900
x2248
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x758
325C
Monsters and Diamonds
dfs and similar
,
graphs
,
shortest paths
2600
x333
321C
Ciel the Commander
constructive algorithms
,
dfs and similar
,
divide and conquer
,
greedy
,
trees
2100
x6955
320B
Ping-Pong (Easy Version)
dfs and similar
,
graphs
1500
x7131
317C
Balance
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x491
316F3
Suns and Rays
constructive algorithms
,
dfs and similar
,
implementation
2200
x164
316F1
Suns and Rays
dfs and similar
,
implementation
2200
x165
316B2
EKG
dfs and similar
,
dp
1600
x1573
316B1
EKG
brute force
,
dfs and similar
1500
x1364
314B
Sereja and Periods
binary search
,
dfs and similar
,
strings
2000
x1457
300B
Coach
brute force
,
dfs and similar
,
graphs
1500
x6183
292D
Connected Components
data structures
,
dfs and similar
,
dp
,
dsu
1900
x2356
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1285
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x130
288D
Polo the Penguin and Trees
combinatorics
,
dfs and similar
,
trees
2400
x679
283B
Cow Program
dfs and similar
,
dp
,
graphs
1700
x3622
277A
Learning Languages
dfs and similar
,
dsu
1400
x18338
274D
Lovely Matrix
dfs and similar
,
graphs
,
greedy
,
sortings
2200
x1014
274B
Zero Tree
dfs and similar
,
dp
,
greedy
,
trees
1800
x4928
267B
Dominoes
dfs and similar
,
graphs
2000
x617
263D
Cycle in Graph
dfs and similar
,
graphs
1800
x3366
263C
Circle of Numbers
brute force
,
dfs and similar
,
implementation
2000
x1062
258E
Little Elephant and Tree
data structures
,
dfs and similar
,
trees
2400
x1043
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x506
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2551
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x169
246E
Blood Cousins Return
binary search
,
data structures
,
dfs and similar
,
dp
,
sortings
2400
x3039
246D
Colorful Graph
brute force
,
dfs and similar
,
graphs
1600
x9282
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4412
243C
Colorado Potato Beetle
dfs and similar
,
implementation
2200
x524
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1851
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8242
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x354
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
228E
The Road to Berland is Paved With Good Intentions
2-sat
,
dfs and similar
,
dsu
,
graphs
1900
x2374
225D
Snake
bitmasks
,
dfs and similar
,
graphs
,
implementation
2200
x917
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x8863
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x246
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x20662
216B
Forming Teams
dfs and similar
,
implementation
1700
x6189
213A
Game
dfs and similar
,
greedy
1700
x1695
212E
IT Restaurants
dfs and similar
,
dp
,
trees
1500
x1688
208E
Blood Cousins
binary search
,
data structures
,
dfs and similar
,
trees
2100
x6256
208B
Solitaire
dfs and similar
,
dp
1900
x1347
196B
Infinite Maze
dfs and similar
,
graphs
2000
x2139
191C
Fools and Roads
data structures
,
dfs and similar
,
trees
1900
x6910
190C
STL
dfs and similar
1500
x2744
187C
Weak Memory
dfs and similar
,
dsu
2000
x1305
183C
Cyclic Coloring
dfs and similar
2200
x600
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2481
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x2491
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x1086
173B
Chamber of Secrets
dfs and similar
,
shortest paths
1800
x2923
172E
BHTML+BCSS
*special problem
,
dfs and similar
,
expression parsing
2200
x269
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x550
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x6369
164A
Variable, or There and Back Again
dfs and similar
,
graphs
1700
x987
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1549
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x13968
160D
Edges in MST
dfs and similar
,
dsu
,
graphs
,
sortings
2300
x2409
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x4035
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3846
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x295
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x1938
131D
Subway
dfs and similar
,
graphs
1600
x4553
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x11864
128A
Statues
dfs and similar
1500
x3141
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x698
118E
Bertown roads
dfs and similar
,
graphs
2000
x6291
117C
Cycle
dfs and similar
,
graphs
2000
x2569
115A
Party
dfs and similar
,
graphs
,
trees
900
x33411
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x4996
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x8618
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x75
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x374
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x861
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x523
82C
General Mobilization
data structures
,
dfs and similar
,
sortings
2000
x802
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x331
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x982
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x1052
73D
FreeDiv
dfs and similar
,
graphs
,
greedy
2200
x619
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x89
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x421
63E
Sweets Game
bitmasks
,
dfs and similar
,
dp
,
games
,
implementation
2000
x718
62D
Wormhouse
dfs and similar
,
graphs
2300
x350
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6333
60C
Mushroom Strife
brute force
,
dfs and similar
2100
x553
60B
Serial Time!
dfs and similar
,
dsu
1400
x4507
57A
Square Earth?
dfs and similar
,
greedy
,
implementation
1300
x2830
51F
Caterpillar
dfs and similar
,
dp
,
graphs
,
trees
2800
x551
42E
Baldman and the military
dfs and similar
,
graphs
,
trees
2700
x197
35C
Fire Again
brute force
,
dfs and similar
,
shortest paths
1500
x6567
34D
Road Map
dfs and similar
,
graphs
1600
x4941
31D
Chocolate
dfs and similar
,
implementation
2000
x1002
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