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Before contest
Codeforces Round 945 (Div. 2)
4 days
→ Filter Problems
Difficulty:
—
brute force
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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Custom test
Problems
#
Name
496A
Minimum Difficulty
brute force
,
implementation
,
math
900
x16106
670A
Holidays
brute force
,
constructive algorithms
,
greedy
,
math
900
x16421
1351B
Square?
brute force
,
implementation
,
math
900
x16454
1808A
Lucky Numbers
brute force
,
implementation
900
x17339
6A
Triangle
brute force
,
geometry
900
x19088
1272A
Three Friends
brute force
,
greedy
,
math
,
sortings
900
x20046
1496A
Split it!
brute force
,
constructive algorithms
,
greedy
,
strings
900
x20277
1494A
ABC String
bitmasks
,
brute force
,
implementation
900
x20418
1430A
Number of Apartments
brute force
,
constructive algorithms
,
math
900
x20463
1795B
Ideal Point
brute force
,
geometry
,
greedy
900
x21174
205A
Little Elephant and Rozdil
brute force
,
implementation
900
x21540
1875A
Jellyfish and Undertale
brute force
,
greedy
900
x21836
1679A
AvtoBus
brute force
,
greedy
,
math
,
number theory
900
x21917
1005B
Delete from the Left
brute force
,
implementation
,
strings
900
x22361
1617B
GCD Problem
brute force
,
constructive algorithms
,
math
,
number theory
900
x22432
1380A
Three Indices
brute force
,
data structures
900
x23326
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x23829
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x25138
1555A
PizzaForces
brute force
,
math
900
x27294
1535B
Array Reodering
brute force
,
greedy
,
math
,
number theory
,
sortings
900
x29628
1339A
Filling Diamonds
brute force
,
dp
,
implementation
,
math
900
x31120
1462C
Unique Number
brute force
,
greedy
,
math
900
x31283
1850D
Balanced Round
brute force
,
greedy
,
implementation
,
sortings
900
x32476
320A
Magic Numbers
brute force
,
greedy
900
x33672
460A
Vasya and Socks
brute force
,
implementation
,
math
900
x44325
1343A
Candies
brute force
,
math
900
x46340
1475B
New Year's Number
brute force
,
dp
,
math
900
x46502
580A
Kefa and First Steps
brute force
,
dp
,
implementation
900
x84073
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x5899
181A
Series of Crimes
brute force
,
geometry
,
implementation
800
x6711
794A
Bank Robbery
brute force
,
implementation
800
x6918
1250F
Data Center
brute force
,
implementation
800
x7150
157A
Game Outcome
brute force
800
x7414
46A
Ball Game
brute force
,
implementation
800
x8383
747A
Display Size
brute force
,
math
800
x10040
888A
Local Extrema
brute force
,
implementation
800
x10668
931A
Friends Meeting
brute force
,
greedy
,
implementation
,
math
800
x11700
811A
Vladik and Courtesy
brute force
,
implementation
800
x11707
32A
Reconnaissance
brute force
800
x12016
1534A
Colour the Flag
brute force
,
implementation
800
x12583
796A
Buying A House
brute force
,
implementation
800
x12840
629A
Far Relative’s Birthday Cake
brute force
,
combinatorics
,
constructive algorithms
,
implementation
800
x13122
854A
Fraction
brute force
,
constructive algorithms
,
math
800
x13403
1060A
Phone Numbers
brute force
800
x13721
1305A
Kuroni and the Gifts
brute force
,
constructive algorithms
,
greedy
,
sortings
800
x13785
47A
Triangular numbers
brute force
,
math
800
x14326
908A
New Year and Counting Cards
brute force
,
implementation
800
x14613
1271A
Suits
brute force
,
greedy
,
math
800
x14687
1415A
Prison Break
brute force
,
math
800
x14921
1898A
Milica and String
brute force
,
implementation
,
strings
800
x15072
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15797
1236A
Stones
brute force
,
greedy
,
math
800
x15816
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x15884
919A
Supermarket
brute force
,
greedy
,
implementation
800
x15912
1750B
Maximum Substring
brute force
,
greedy
,
implementation
800
x15955
551A
GukiZ and Contest
brute force
,
implementation
,
sortings
800
x16021
764A
Taymyr is calling you
brute force
,
implementation
,
math
800
x16046
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x16259
1689A
Lex String
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
800
x16381
1088A
Ehab and another construction problem
brute force
,
constructive algorithms
800
x16437
1561A
Simply Strange Sort
brute force
,
implementation
,
sortings
800
x16451
1884A
Simple Design
brute force
,
greedy
,
math
800
x16461
918A
Eleven
brute force
,
implementation
800
x16763
1761A
Two Permutations
brute force
,
constructive algorithms
800
x16975
1789A
Serval and Mocha's Array
brute force
,
math
,
number theory
800
x17054
1091A
New Year and the Christmas Ornament
brute force
,
implementation
,
math
800
x17336
1612A
Distance
brute force
,
constructive algorithms
800
x17489
755A
PolandBall and Hypothesis
brute force
,
graphs
,
math
,
number theory
800
x17533
1437A
Marketing Scheme
brute force
,
constructive algorithms
,
greedy
,
math
800
x17823
1191A
Tokitsukaze and Enhancement
brute force
800
x17851
1491A
K-th Largest Value
brute force
,
greedy
,
implementation
800
x18041
1546A
AquaMoon and Two Arrays
brute force
,
greedy
800
x18084
1114A
Got Any Grapes?
brute force
,
greedy
,
implementation
800
x18247
1654A
Maximum Cake Tastiness
brute force
,
greedy
,
implementation
,
sortings
800
x18414
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18567
1167A
Telephone Number
brute force
,
greedy
,
strings
800
x18790
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x18886
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x19315
1323A
Even Subset Sum Problem
brute force
,
dp
,
greedy
,
implementation
800
x19377
1623A
Robot Cleaner
brute force
,
implementation
,
math
800
x19892
1536A
Omkar and Bad Story
brute force
,
constructive algorithms
800
x20042
1200A
Hotelier
brute force
,
data structures
,
implementation
800
x20046
855A
Tom Riddle's Diary
brute force
,
implementation
,
strings
800
x20145
1810A
Beautiful Sequence
brute force
,
greedy
800
x20355
1644B
Anti-Fibonacci Permutation
brute force
,
constructive algorithms
,
implementation
800
x20458
1734A
Select Three Sticks
brute force
,
greedy
,
sortings
800
x20763
1720B
Interesting Sum
brute force
,
data structures
,
greedy
,
math
,
sortings
800
x20765
1688A
Cirno's Perfect Bitmasks Classroom
bitmasks
,
brute force
800
x20823
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x20872
1269A
Equation
brute force
,
math
800
x20895
22A
Second Order Statistics
brute force
800
x20919
1230A
Dawid and Bags of Candies
brute force
,
implementation
800
x20994
1680A
Minimums and Maximums
brute force
,
math
800
x21028
1805A
We Need the Zero
bitmasks
,
brute force
800
x21106
1228A
Distinct Digits
brute force
,
implementation
800
x21242
1207A
There Are Two Types Of Burgers
brute force
,
greedy
,
implementation
,
math
800
x21356
1064A
Make a triangle!
brute force
,
geometry
,
math
800
x21710
1176A
Divide it!
brute force
,
greedy
,
implementation
800
x21915
1637A
Sorting Parts
brute force
,
sortings
800
x22078
1466A
Bovine Dilemma
brute force
,
geometry
,
math
800
x22273
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