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Before contest
Codeforces Round #851 (Div. 2)
2 days
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→ Filter Problems
Difficulty:
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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
162G
Non-decimal sum
*special problem
2000
x44
153E
Euclidean Distance
*special problem
2100
x54
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x58
207C1
Game with Two Trees
2100
x60
162I
Truncatable primes
*special problem
2000
x60
207D6
The Beaver's Problem - 3
2100
x63
207D10
The Beaver's Problem - 3
2100
x65
153D
Date Change
*special problem
2000
x65
661E
Divisibility Check
*special problem
2000
x69
207D2
The Beaver's Problem - 3
2000
x85
530F
Jumping frogs
*special problem
2100
x89
345C
Counting Fridays
*special problem
2000
x113
530H
Points in triangle
*special problem
,
geometry
2100
x114
530G
Levenshtein distance
*special problem
2100
x114
345B
Triskaidekaphobia
*special problem
2100
x114
207D3
The Beaver's Problem - 3
2000
x116
1431G
Number Deletion Game
*special problem
,
dp
,
games
,
greedy
2100
x118
661D
Maximal Difference
*special problem
2100
x118
661C
Array Sum
*special problem
2000
x121
207D4
The Beaver's Problem - 3
2100
x130
1431F
Neural Network Problem
*special problem
,
binary search
,
greedy
2100
x141
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x142
45H
Road Problem
graphs
2100
x147
64F
Domain
*special problem
,
expression parsing
2000
x152
926F
Mobile Communications
2000
x154
1211E
Double Permutation Inc.
*special problem
,
binary search
,
greedy
2000
x169
1211D
Teams
*special problem
,
binary search
,
greedy
,
math
2000
x181
207A3
Beaver's Calculator 1.0
greedy
2000
x184
774B
Significant Cups
*special problem
,
binary search
,
data structures
,
two pointers
2100
x193
1431E
Chess Match
*special problem
2000
x201
1346F
Dune II: Battle For Arrakis
*special problem
,
data structures
,
greedy
,
math
2000
x205
178E2
The Beaver's Problem - 2
2000
x210
178D3
Magic Squares
2100
x210
178C3
Smart Beaver and Resolving Collisions
2000
x270
774A
Amusement Park
*special problem
,
ternary search
2100
x278
774L
Bars
*special problem
,
binary search
2000
x279
926J
Segments
data structures
2100
x288
852C
Property
greedy
,
sortings
2100
x289
209B
Pixels
constructive algorithms
,
math
2100
x313
774J
Stepan's Series
*special problem
,
dp
2000
x320
38F
Smart Boy
dp
,
games
,
strings
2100
x334
212C
Cowboys
combinatorics
,
dp
,
math
2100
x339
386D
Game with Points
dp
,
graphs
,
implementation
,
shortest paths
2100
x344
228D
Zigzag
data structures
2100
x349
54D
Writing a Song
brute force
,
dp
,
strings
2100
x376
802D
Marmots (easy)
math
2100
x380
306C
White, Black and White Again
combinatorics
,
number theory
2100
x387
306B
Optimizer
data structures
,
greedy
,
sortings
2100
x393
309B
Context Advertising
dp
,
two pointers
2100
x399
250E
Mad Joe
brute force
2000
x409
228C
Fractal Detector
dp
,
hashing
2000
x416
164B
Ancient Berland Hieroglyphs
two pointers
2000
x417
176C
Playing with Superglue
combinatorics
,
constructive algorithms
2000
x424
491B
New York Hotel
greedy
,
math
2100
x425
254E
Dormitory
dp
,
implementation
2100
x429
309A
Morning run
binary search
,
math
,
two pointers
2000
x435
132B
Piet
implementation
2100
x443
76B
Mice
greedy
,
two pointers
2100
x443
690D3
The Wall (hard)
dp
2100
x451
215C
Crosses
brute force
,
implementation
2100
x455
73B
Need For Brake
binary search
,
greedy
,
sortings
2000
x462
342D
Xenia and Dominoes
bitmasks
,
dfs and similar
,
dp
2100
x463
48E
Ivan the Fool VS Gorynych the Dragon
dp
,
games
,
graphs
2100
x469
241C
Mirror Box
geometry
,
implementation
2000
x476
45E
Director
constructive algorithms
,
greedy
2000
x481
215E
Periodical Numbers
combinatorics
,
dp
,
number theory
2100
x482
335C
More Reclamation
games
2100
x487
838B
Diverging Directions
data structures
,
dfs and similar
,
trees
2100
x495
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x500
44J
Triminoes
constructive algorithms
,
greedy
2000
x507
1218I
The Light Square
2-sat
,
dfs and similar
,
greedy
2100
x511
216E
Martian Luck
math
,
number theory
2000
x514
163C
Conveyor
sortings
,
two pointers
2100
x517
60C
Mushroom Strife
brute force
,
dfs and similar
2100
x520
69C
Game
implementation
2000
x522
39C
Moon Craters
dp
,
sortings
2100
x522
1219G
Harvester
implementation
2000
x523
802K
Send the Fool Further! (medium)
dp
,
trees
2100
x528
234H
Merging Two Decks
constructive algorithms
,
greedy
2000
x529
34E
Collisions
brute force
,
implementation
,
math
2000
x530
267B
Dominoes
dfs and similar
,
graphs
2000
x537
59D
Team Arrangement
constructive algorithms
,
greedy
,
implementation
2000
x539
131F
Present to Mom
binary search
,
two pointers
2000
x546
1387A
Graph
*special problem
,
binary search
,
dfs and similar
,
dp
,
math
,
ternary search
2100
x555
50D
Bombing
binary search
,
dp
,
probabilities
2100
x558
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x563
370D
Broken Monitor
brute force
,
constructive algorithms
,
greedy
,
implementation
2100
x572
952E
Cheese Board
2000
x577
109D
Lucky Sorting
constructive algorithms
,
sortings
2000
x577
47C
Crossword
implementation
2000
x584
81D
Polycarp's Picture Gallery
constructive algorithms
,
greedy
2100
x586
39A
C*++ Calculations
expression parsing
,
greedy
2000
x598
656C
Without Text
*special problem
2000
x600
66E
Petya and Post
data structures
,
dp
2000
x600
63E
Sweets Game
bitmasks
,
dfs and similar
,
dp
,
games
,
implementation
2000
x615
630O
Arrow
geometry
2000
x623
195E
Building Forest
data structures
,
dsu
,
graphs
2000
x629
101C
Vectors
implementation
,
math
2000
x629
35E
Parade
data structures
,
sortings
2100
x629
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x634
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