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Codeforces Round 1131 (Div. 3)
4 days
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combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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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Status
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Custom test
Problems
#
Name
518A
Vitaly and Strings
constructive algorithms
,
strings
1600
x9618
510C
Fox And Names
dfs and similar
,
graphs
,
sortings
1600
x24516
508C
Anya and Ghosts
constructive algorithms
,
greedy
1600
x4707
500C
New Year Book Reading
constructive algorithms
,
greedy
,
implementation
,
math
1600
x6068
500B
New Year Permutation
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
1600
x9823
495B
Modular Equations
math
,
number theory
1600
x8576
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x7636
476C
Dreamoon and Sums
math
1600
x6086
453A
Little Pony and Expected Maximum
probabilities
1600
x13370
446A
DZY Loves Sequences
dp
,
implementation
,
two pointers
1600
x13850
444A
DZY Loves Physics
greedy
,
math
1600
x3610
440B
Balancer
greedy
,
implementation
1600
x2366
435C
Cardiogram
implementation
1600
x2762
431C
k-Tree
dp
,
implementation
,
trees
1600
x31278
430A
Points and Segments (easy)
constructive algorithms
,
sortings
1600
x2440
429B
Working out
dp
1600
x10672
424C
Magic Formulas
math
1600
x6063
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x8881
411B
Multi-core Processor
implementation
1600
x1432
407B
Long Path
dp
,
implementation
1600
x7315
407A
Triangle
brute force
,
geometry
,
implementation
,
math
1600
x5233
405C
Unusual Product
implementation
,
math
1600
x4987
383A
Milking cows
data structures
,
greedy
1600
x5649
380A
Sereja and Prefixes
binary search
,
brute force
1600
x2965
377A
Maze
dfs and similar
1600
x29114
375B
Maximum Submatrix 2
data structures
,
dp
,
implementation
,
sortings
1600
x5491
375A
Divisible by Seven
math
,
number theory
1600
x5444
373B
Making Sequences is Fun
binary search
,
implementation
,
math
1600
x2833
372A
Counting Kangaroos is Fun
binary search
,
greedy
,
sortings
,
two pointers
1600
x16217
371C
Hamburgers
binary search
,
brute force
1600
x37927
369C
Valera and Elections
dfs and similar
,
graphs
,
trees
1600
x12438
364A
Matrix
combinatorics
,
data structures
,
implementation
1600
x5019
353C
Find Maximum
implementation
,
math
,
number theory
1600
x5323
350C
Bombs
greedy
,
implementation
,
sortings
1600
x6886
348A
Mafia
binary search
,
math
,
sortings
1600
x15243
346A
Alice and Bob
games
,
math
,
number theory
1600
x9509
343B
Alternating Current
data structures
,
greedy
,
implementation
1600
x19361
343A
Rational Resistance
math
,
number theory
1600
x10264
340C
Tourist Problem
combinatorics
,
implementation
,
math
1600
x4771
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x5302
333A
Secrets
greedy
1600
x4381
323A
Black-and-White Cube
combinatorics
,
constructive algorithms
1600
x990
322B
Ciel and Flowers
combinatorics
,
math
1600
x13504
319A
Malek Dance Club
combinatorics
,
math
1600
x3067
317A
Perfect Pair
brute force
1600
x4979
316B2
EKG
dfs and similar
,
dp
1600
x1803
314A
Sereja and Contest
implementation
1600
x2202
305C
Ivan and Powers of Two
greedy
,
implementation
1600
x2693
305A
Strange Addition
brute force
,
constructive algorithms
,
implementation
1600
x5292
297B
Fish Weight
constructive algorithms
,
greedy
1600
x3800
291D
Parallel Programming
*special problem
,
greedy
1600
x1545
291C
Network Mask
*special problem
,
bitmasks
,
brute force
,
implementation
1600
x1908
283A
Cows and Sequence
constructive algorithms
,
data structures
,
implementation
1600
x6951
272D
Dima and Two Sequences
combinatorics
,
math
,
sortings
1600
x2890
269A
Magical Boxes
greedy
,
math
1600
x3730
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x4117
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2974
250C
Movie Critics
greedy
1600
x2279
246D
Colorful Graph
brute force
,
dfs and similar
,
graphs
1600
x10482
246C
Beauty Pageant
brute force
,
constructive algorithms
,
greedy
1600
x2886
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x5018
243A
The Brand New Function
bitmasks
1600
x4562
237C
Primes on Interval
binary search
,
number theory
,
two pointers
1600
x6961
235A
LCM Challenge
number theory
1600
x21937
234G
Practice
constructive algorithms
,
divide and conquer
,
implementation
1600
x1611
234E
Champions' League
implementation
1600
x1064
234D
Cinema
implementation
1600
x1616
232A
Cycles
binary search
,
constructive algorithms
,
graphs
,
greedy
1600
x2891
231D
Magic Box
brute force
,
geometry
1600
x4386
231C
To Add or Not to Add
binary search
,
sortings
,
two pointers
1600
x10033
225B
Well-known Numbers
binary search
,
greedy
,
number theory
1600
x3441
219C
Color Stripe
brute force
,
dp
,
greedy
1600
x7332
214B
Hometask
brute force
,
constructive algorithms
,
greedy
,
math
1600
x5430
209A
Multicolored Marbles
dp
,
math
1600
x2976
207D7
The Beaver's Problem - 3
1600
x114
207D5
The Beaver's Problem - 3
1600
x157
207B1
Military Trainings
1600
x364
207A1
Beaver's Calculator 1.0
greedy
1600
x381
197A
Plate Game
constructive algorithms
,
games
,
math
1600
x6980
188G
Array Sorting
*special problem
,
implementation
1600
x365
178C1
Smart Beaver and Resolving Collisions
1600
x593
178B2
Greedy Merchants
1600
x811
178B1
Greedy Merchants
1600
x904
175C
Geometry Horse
greedy
,
implementation
,
sortings
,
two pointers
1600
x1593
171G
Mysterious numbers - 2
*special problem
1600
x1078
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1503
167A
Wizards and Trolleybuses
implementation
,
math
1600
x2219
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x14237
156B
Suspects
constructive algorithms
,
data structures
,
implementation
1600
x2510
154B
Colliders
math
,
number theory
1600
x6391
154A
Hometask
greedy
1600
x4367
153A
A + B
*special problem
1600
x962
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x5665
149B
Martian Clock
implementation
1600
x2412
142A
Help Farmer
brute force
,
math
1600
x2889
139B
Wallpaper
implementation
,
math
1600
x1480
138A
Literature Lesson
implementation
1600
x2628
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2762
131D
Subway
dfs and similar
,
graphs
1600
x5394
130H
Balanced brackets
*special problem
1600
x975
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