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Before contest
Codeforces Round 941 (Div. 1)
46:17:14
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
46:17:14
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math
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
986B
Petr and Permutations
combinatorics
,
math
1800
x4553
442B
Andrey and Problem
greedy
,
math
,
probabilities
1800
x4845
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x4954
1781D
Many Perfect Squares
brute force
,
math
,
number theory
1800
x5217
1151C
Problem for Nazar
constructive algorithms
,
math
1800
x5246
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5264
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5376
1750D
Count GCD
combinatorics
,
math
,
number theory
1800
x5528
687B
Remainders Game
chinese remainder theorem
,
math
,
number theory
1800
x5534
1477A
Nezzar and Board
constructive algorithms
,
math
,
number theory
1800
x5654
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5731
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x5735
776C
Molly's Chemicals
binary search
,
brute force
,
data structures
,
implementation
,
math
1800
x5738
1872F
Selling a Menagerie
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1800
x5749
1186C
Vus the Cossack and Strings
implementation
,
math
1800
x5827
1848C
Vika and Price Tags
math
,
number theory
1800
x5917
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x5986
1705D
Mark and Lightbulbs
combinatorics
,
constructive algorithms
,
greedy
,
math
,
sortings
1800
x6083
1648B
Integral Array
brute force
,
constructive algorithms
,
data structures
,
math
1800
x6168
1620C
BA-String
brute force
,
dp
,
greedy
,
implementation
,
math
1800
x6340
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x6457
1152C
Neko does Maths
brute force
,
math
,
number theory
1800
x6517
1846E2
Rudolf and Snowflakes (hard version)
binary search
,
brute force
,
implementation
,
math
1800
x6550
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x6673
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x6735
988D
Points and Powers of Two
brute force
,
math
1800
x6772
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x6840
1491D
Zookeeper and The Infinite Zoo
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
1800
x6869
1466E
Apollo versus Pan
bitmasks
,
brute force
,
math
1800
x6932
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x6961
1316C
Primitive Primes
constructive algorithms
,
math
,
ternary search
1800
x7005
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x7200
1426E
Rock, Paper, Scissors
brute force
,
constructive algorithms
,
flows
,
greedy
,
math
1800
x7211
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7263
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7278
1637D
Yet Another Minimization Problem
dp
,
greedy
,
math
1800
x7347
1225D
Power Products
hashing
,
math
,
number theory
1800
x7364
1852A
Ntarsis' Set
binary search
,
math
,
number theory
1800
x7524
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x8039
1295D
Same GCDs
math
,
number theory
1800
x8399
1327E
Count The Blocks
combinatorics
,
dp
,
math
1800
x8487
1500A
Going Home
brute force
,
hashing
,
implementation
,
math
1800
x8527
1329A
Dreamoon Likes Coloring
constructive algorithms
,
greedy
,
implementation
,
math
1800
x8771
584D
Dima and Lisa
brute force
,
math
,
number theory
1800
x8798
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x8843
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x9249
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x9330
1437C
Chef Monocarp
dp
,
flows
,
graph matchings
,
greedy
,
math
,
sortings
1800
x10084
1355C
Count Triangles
binary search
,
implementation
,
math
,
two pointers
1800
x10177
1328D
Carousel
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
1800
x12485
183A
Headquarters
constructive algorithms
,
math
1700
x525
929C
Красивая команда
*special problem
,
combinatorics
,
math
1700
x1141
630Q
Pyramids
geometry
,
math
1700
x1209
457A
Golden System
math
,
meet-in-the-middle
1700
x1261
303B
Rectangle Puzzle II
implementation
,
math
1700
x1329
203D
Hit Ball
geometry
,
implementation
,
math
1700
x1398
81C
Average Score
greedy
,
math
,
sortings
1700
x1624
49C
Disposition
constructive algorithms
,
math
1700
x1637
76E
Points
implementation
,
math
1700
x1651
910C
Minimum Sum
constructive algorithms
,
greedy
,
math
1700
x1731
76D
Plus and xor
dp
,
greedy
,
math
1700
x1988
305B
Continued Fractions
brute force
,
implementation
,
math
1700
x2032
32C
Flea
math
1700
x2049
18B
Platforms
brute force
,
math
1700
x2059
533C
Board Game
games
,
greedy
,
implementation
,
math
1700
x2140
288C
Polo the Penguin and XOR operation
implementation
,
math
1700
x2232
1906M
Triangle Construction
greedy
,
math
1700
x2286
765D
Artsem and Saunders
constructive algorithms
,
dsu
,
math
1700
x2438
201A
Clear Symmetry
constructive algorithms
,
dp
,
math
1700
x2960
850A
Five Dimensional Points
brute force
,
geometry
,
math
1700
x2992
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3041
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3043
405D
Toy Sum
greedy
,
implementation
,
math
1700
x3083
198A
About Bacteria
implementation
,
math
1700
x3100
327C
Magic Five
combinatorics
,
math
1700
x3107
1142A
The Beatles
brute force
,
math
1700
x3257
931C
Laboratory Work
implementation
,
math
1700
x3289
451C
Predict Outcome of the Game
brute force
,
implementation
,
math
1700
x3296
696B
Puzzles
dfs and similar
,
math
,
probabilities
,
trees
1700
x3377
160C
Find Pair
implementation
,
math
,
sortings
1700
x3380
581D
Three Logos
bitmasks
,
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3411
895B
XK Segments
binary search
,
math
,
sortings
,
two pointers
1700
x3416
471C
MUH and House of Cards
binary search
,
brute force
,
greedy
,
math
1700
x3533
321A
Ciel and Robot
binary search
,
implementation
,
math
1700
x3549
729D
Sea Battle
constructive algorithms
,
greedy
,
math
1700
x3608
949B
A Leapfrog in the Array
constructive algorithms
,
math
1700
x3638
758C
Unfair Poll
binary search
,
constructive algorithms
,
implementation
,
math
1700
x3817
449A
Jzzhu and Chocolate
greedy
,
math
1700
x3865
627A
XOR Equation
dp
,
math
1700
x3946
1677B
Tokitsukaze and Meeting
data structures
,
implementation
,
math
1700
x4008
140A
New Year Table
geometry
,
math
1700
x4080
685A
Robbers' watch
brute force
,
combinatorics
,
dp
,
math
1700
x4142
678D
Iterated Linear Function
math
,
number theory
1700
x4261
507C
Guess Your Way Out!
implementation
,
math
,
trees
1700
x4273
936A
Save Energy!
binary search
,
implementation
,
math
1700
x4313
718A
Efim and Strange Grade
dp
,
implementation
,
math
1700
x4316
789B
Masha and geometric depression
brute force
,
implementation
,
math
1700
x4342
773A
Success Rate
binary search
,
math
1700
x4352
1043D
Mysterious Crime
brute force
,
combinatorics
,
math
,
meet-in-the-middle
,
two pointers
1700
x4366
900C
Remove Extra One
brute force
,
data structures
,
math
1700
x4408
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