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Before contest
Codeforces Round 959 sponsored by NEAR (Div. 1 + Div. 2)
06:08:38
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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
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number theory
probabilities
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shortest paths
sortings
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ternary search
trees
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Problems
#
Name
207D6
The Beaver's Problem - 3
2100
x80
207D4
The Beaver's Problem - 3
2100
x149
207D3
The Beaver's Problem - 3
2000
x136
207D2
The Beaver's Problem - 3
2000
x105
207D10
The Beaver's Problem - 3
2100
x82
207C2
Game with Two Trees
2200
x80
207C1
Game with Two Trees
2100
x104
207A3
Beaver's Calculator 1.0
greedy
2000
x206
204D
Little Elephant and Retro Strings
dp
2400
x446
204C
Little Elephant and Furik and Rubik
math
,
probabilities
2000
x1090
203E
Transportation
greedy
,
sortings
,
two pointers
2300
x279
201C
Fragile Bridges
dp
2000
x1303
200E
Tractor College
implementation
,
math
,
number theory
,
ternary search
2400
x340
200A
Cinema
brute force
,
data structures
2400
x675
198E
Gripping Story
binary search
,
data structures
,
sortings
2400
x405
198C
Delivering Carcinogen
binary search
,
geometry
2400
x370
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x807
196B
Infinite Maze
dfs and similar
,
graphs
2000
x2150
195E
Building Forest
data structures
,
dsu
,
graphs
2000
x693
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x508
193B
Xor
brute force
2000
x999
191E
Thwarting Demonstrations
binary search
,
data structures
,
trees
2200
x818
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1466
187C
Weak Memory
dfs and similar
,
dsu
2000
x1307
185C
Clever Fat Rat
dp
2500
x133
183C
Cyclic Coloring
dfs and similar
2200
x603
182C
Optimal Sum
data structures
,
greedy
2000
x713
182A
Battlefield
geometry
,
graphs
,
implementation
,
shortest paths
2200
x280
180B
Divisibility Rules
math
,
number theory
2300
x331
178F3
Representative Sampling
2500
x412
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x322
178E3
The Beaver's Problem - 2
2300
x201
178E2
The Beaver's Problem - 2
2000
x230
178D3
Magic Squares
2100
x242
178C3
Smart Beaver and Resolving Collisions
2000
x299
177G1
Fibonacci Strings
strings
2400
x170
177F2
Script Generation
2300
x204
176D
Hyper String
dp
2500
x305
176C
Playing with Superglue
combinatorics
,
constructive algorithms
2000
x470
175D
Plane of Tanks: Duel
brute force
,
dp
,
math
,
probabilities
2400
x296
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x247
172E
BHTML+BCSS
*special problem
,
dfs and similar
,
expression parsing
2200
x269
171E
MYSTERIOUS LANGUAGE
*special problem
2000
x1435
171C
A Piece of Cake
*special problem
,
implementation
2000
x1068
167C
Wizards and Numbers
games
,
math
2300
x659
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x349
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
164C
Machine Programming
flows
,
graphs
2400
x887
164B
Ancient Berland Hieroglyphs
two pointers
2000
x451
163C
Conveyor
sortings
,
two pointers
2100
x538
163B
Lemmings
binary search
2000
x1048
162I
Truncatable primes
*special problem
2000
x75
162G
Non-decimal sum
*special problem
2000
x60
161E
Polycarpus the Safecracker
brute force
,
dp
2500
x464
161C
Abracadabra
divide and conquer
2400
x643
160E
Buses and People
binary search
,
data structures
,
sortings
2400
x580
160D
Edges in MST
dfs and similar
,
dsu
,
graphs
,
sortings
2300
x2419
156D
Clues
combinatorics
,
graphs
2500
x1508
156C
Cipher
combinatorics
,
dp
2000
x2332
154D
Flatland Fencing
games
,
math
2400
x423
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2728
153E
Euclidean Distance
*special problem
2100
x78
153D
Date Change
*special problem
2000
x82
153C
Caesar Cipher
*special problem
2200
x372
152E
Garden
bitmasks
,
dp
,
graphs
,
trees
2500
x466
150C
Smart Cheater
data structures
,
math
,
probabilities
2200
x638
149E
Martian Strings
string suffix structures
,
strings
2300
x2060
147B
Smile House
binary search
,
graphs
,
matrices
2500
x764
145E
Lucky Queries
data structures
2400
x2998
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
138D
World of Darkraft
dp
,
games
2500
x478
138C
Mushroom Gnomes - 2
binary search
,
data structures
,
probabilities
,
sortings
2200
x847
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1200
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x295
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
131F
Present to Mom
binary search
,
two pointers
2000
x636
130I
Array sorting
*special problem
,
sortings
2300
x166
128D
Numbers
constructive algorithms
,
implementation
2000
x1097
128C
Games with Rectangle
combinatorics
,
dp
2000
x2748
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2484
126D
Fibonacci Sums
dp
,
math
2300
x813
126C
E-reader Display
constructive algorithms
,
greedy
2000
x715
125E
MST Company
binary search
,
graphs
2400
x1040
125D
Two progressions
constructive algorithms
,
greedy
2200
x394
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x702
123D
String
string suffix structures
2300
x1191
123C
Brackets
combinatorics
,
dp
,
greedy
2300
x597
121E
Lucky Array
data structures
2400
x1679
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x273
120I
Luck is in Numbers
greedy
2200
x303
119E
Alternative Reality
geometry
2400
x94
119D
String Transformation
hashing
,
strings
2500
x481
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