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Codeforces Round 959 sponsored by NEAR (Div. 1 + Div. 2)
06:14:18
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combine-tags-by-or
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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
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1572
274D
Lovely Matrix
dfs and similar
,
graphs
,
greedy
,
sortings
2200
x1016
272E
Dima and Horses
combinatorics
,
constructive algorithms
,
graphs
2200
x1180
271E
Three Horses
constructive algorithms
,
math
,
number theory
2200
x481
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1626
268E
Playlist
math
,
probabilities
,
sortings
2100
x981
268D
Wall Bars
dp
2300
x503
266C
Below the Diagonal
constructive algorithms
,
greedy
,
math
2100
x1340
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1519
257E
Greedy Elevator
data structures
,
implementation
2200
x281
255E
Furlo and Rublo and Game
games
,
implementation
,
math
2200
x836
254E
Dormitory
dp
,
implementation
2100
x661
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x527
253E
Printer
binary search
,
data structures
,
implementation
,
sortings
2200
x525
248D
Sweets for Everyone!
binary search
,
greedy
,
implementation
2300
x487
245G
Suggested Friends
brute force
,
graphs
2200
x428
243C
Colorado Potato Beetle
dfs and similar
,
implementation
2200
x524
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1854
241F
Race
brute force
,
implementation
2300
x261
238C
World Eater Brothers
dfs and similar
,
dp
,
greedy
,
trees
2100
x1215
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1768
229D
Towers
dp
,
greedy
,
two pointers
2100
x2177
228D
Zigzag
data structures
2100
x377
226D
The table
constructive algorithms
,
greedy
2100
x956
225E
Unsolvable
math
,
number theory
2100
x790
225D
Snake
bitmasks
,
dfs and similar
,
graphs
,
implementation
2200
x919
220C
Little Elephant and Shifts
data structures
2100
x928
219E
Parking Lot
data structures
2200
x606
217B
Blackboard Fibonacci
brute force
,
math
2100
x873
215E
Periodical Numbers
combinatorics
,
dp
,
number theory
2100
x545
215C
Crosses
brute force
,
implementation
2100
x661
213D
Stars
constructive algorithms
,
geometry
2300
x335
212C
Cowboys
combinatorics
,
dp
,
math
2100
x377
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x329
209B
Pixels
constructive algorithms
,
math
2100
x363
208E
Blood Cousins
binary search
,
data structures
,
dfs and similar
,
trees
2100
x6296
207D8
The Beaver's Problem - 3
2300
x89
207D6
The Beaver's Problem - 3
2100
x80
207D4
The Beaver's Problem - 3
2100
x149
207D10
The Beaver's Problem - 3
2100
x82
207C2
Game with Two Trees
2200
x80
207C1
Game with Two Trees
2100
x104
203E
Transportation
greedy
,
sortings
,
two pointers
2300
x279
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x807
191E
Thwarting Demonstrations
binary search
,
data structures
,
trees
2200
x818
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1466
183C
Cyclic Coloring
dfs and similar
2200
x603
182A
Battlefield
geometry
,
graphs
,
implementation
,
shortest paths
2200
x280
180B
Divisibility Rules
math
,
number theory
2300
x331
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x322
178E3
The Beaver's Problem - 2
2300
x201
178D3
Magic Squares
2100
x242
177F2
Script Generation
2300
x204
172E
BHTML+BCSS
*special problem
,
dfs and similar
,
expression parsing
2200
x269
167C
Wizards and Numbers
games
,
math
2300
x659
166B
Polygons
geometry
,
sortings
2100
x2374
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x6450
165D
Beard Graph
data structures
,
dsu
,
trees
2100
x1608
163C
Conveyor
sortings
,
two pointers
2100
x538
160D
Edges in MST
dfs and similar
,
dsu
,
graphs
,
sortings
2300
x2419
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2728
153E
Euclidean Distance
*special problem
2100
x78
153C
Caesar Cipher
*special problem
2200
x372
150C
Smart Cheater
data structures
,
math
,
probabilities
2200
x638
149E
Martian Strings
string suffix structures
,
strings
2300
x2060
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1897
144E
Competition
data structures
,
greedy
2200
x573
142C
Help Caretaker
brute force
,
dp
2300
x907
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x917
141D
Take-off Ramps
graphs
,
shortest paths
2300
x888
138C
Mushroom Gnomes - 2
binary search
,
data structures
,
probabilities
,
sortings
2200
x847
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x465
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x608
132B
Piet
implementation
2100
x659
130I
Array sorting
*special problem
,
sortings
2300
x166
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2484
126D
Fibonacci Sums
dp
,
math
2300
x813
125D
Two progressions
constructive algorithms
,
greedy
2200
x394
123D
String
string suffix structures
2300
x1191
123C
Brackets
combinatorics
,
dp
,
greedy
2300
x597
120I
Luck is in Numbers
greedy
2200
x303
115C
Plumber
math
2200
x589
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1216
111D
Petya and Coloring
combinatorics
,
dp
2300
x727
111C
Petya and Spiders
bitmasks
,
dp
,
dsu
2100
x1314
106E
Space Rescuers
geometry
,
ternary search
2100
x852
105C
Item World
brute force
,
implementation
,
sortings
2200
x329
103D
Time to Raid Cowavans
brute force
,
data structures
,
sortings
2100
x2037
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x674
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x75
98B
Help King
implementation
,
probabilities
,
trees
2200
x118
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x375
97B
Superset
constructive algorithms
,
divide and conquer
2300
x811
91C
Ski Base
combinatorics
,
dsu
,
graphs
2300
x868
89C
Chip Play
brute force
,
data structures
,
implementation
2300
x614
89B
Widget Library
dp
,
expression parsing
,
graphs
,
implementation
2300
x513
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x861
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x13098
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x403
85D
Sum of Medians
binary search
,
brute force
,
data structures
,
implementation
2300
x1968
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