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Before contest
Codeforces Round 941 (Div. 1)
4 days
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
4 days
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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
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
215B
Olympic Medal
greedy
,
math
1300
x5349
886C
Petya and Catacombs
dsu
,
greedy
,
implementation
,
trees
1300
x5425
887B
Cubes for Masha
brute force
,
implementation
1300
x5526
814B
An express train to reveries
constructive algorithms
1300
x5543
907A
Masha and Bears
brute force
,
implementation
1300
x5549
787B
Not Afraid
greedy
,
implementation
,
math
1300
x5567
821B
Okabe and Banana Trees
brute force
,
math
1300
x5623
1424G
Years
data structures
,
sortings
1300
x5634
628C
Bear and String Distance
greedy
,
strings
1300
x5647
828B
Black Square
implementation
1300
x5650
957A
Tritonic Iridescence
implementation
1300
x5656
976B
Lara Croft and the New Game
implementation
,
math
1300
x5662
185A
Plant
math
1300
x5682
471B
MUH and Important Things
implementation
,
sortings
1300
x5881
792B
Counting-out Rhyme
implementation
1300
x5893
222B
Cosmic Tables
data structures
,
implementation
1300
x5972
1776H
Beppa and SwerChat
two pointers
1300
x5983
493A
Vasya and Football
implementation
1300
x6018
83A
Magical Array
math
1300
x6059
376B
I.O.U.
implementation
1300
x6081
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6169
659B
Qualifying Contest
constructive algorithms
,
sortings
1300
x6176
66A
Petya and Java
implementation
,
strings
1300
x6188
909B
Segments
constructive algorithms
,
math
1300
x6191
288A
Polo the Penguin and Strings
greedy
1300
x6272
152B
Steps
binary search
,
implementation
1300
x6313
485B
Valuable Resources
brute force
,
greedy
1300
x6442
626B
Cards
constructive algorithms
,
dp
,
math
1300
x6500
633B
A Trivial Problem
brute force
,
constructive algorithms
,
math
,
number theory
1300
x6529
630F
Selection of Personnel
combinatorics
,
math
1300
x6542
808B
Average Sleep Time
data structures
,
implementation
,
math
1300
x6567
722A
Broken Clock
brute force
,
implementation
1300
x6569
625C
K-special Tables
constructive algorithms
,
implementation
1300
x6638
572B
Order Book
data structures
,
greedy
,
implementation
,
sortings
1300
x6732
761B
Dasha and friends
brute force
,
implementation
,
math
1300
x6798
257B
Playing Cubes
games
,
greedy
,
implementation
1300
x6848
1159B
Expansion coefficient of the array
implementation
,
math
1300
x6873
1059B
Forgery
implementation
1300
x6889
840A
Leha and Function
combinatorics
,
greedy
,
math
,
number theory
,
sortings
1300
x6953
844B
Rectangles
combinatorics
,
math
1300
x6972
612A
The Text Splitting
brute force
,
implementation
,
strings
1300
x7004
1040B
Shashlik Cooking
dp
,
greedy
,
math
1300
x7008
610B
Vika and Squares
constructive algorithms
,
implementation
1300
x7038
897B
Chtholly's request
brute force
1300
x7072
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7357
318B
Strings of Power
implementation
,
strings
,
two pointers
1300
x7359
472B
Design Tutorial: Learn from Life
1300
x7375
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7421
962B
Students in Railway Carriage
constructive algorithms
,
greedy
,
implementation
1300
x7583
900B
Position in Fraction
math
,
number theory
1300
x7619
915B
Browser
implementation
1300
x7634
1113B
Sasha and Magnetic Machines
greedy
,
number theory
1300
x7657
303A
Lucky Permutation Triple
constructive algorithms
,
implementation
,
math
1300
x7670
558B
Amr and The Large Array
implementation
1300
x7752
932B
Recursive Queries
binary search
,
data structures
,
dfs and similar
1300
x7777
1209B
Koala and Lights
implementation
,
math
,
number theory
1300
x7933
982B
Bus of Characters
data structures
,
greedy
,
implementation
1300
x8142
899C
Dividing the numbers
constructive algorithms
,
graphs
,
math
1300
x8257
798B
Mike and strings
brute force
,
dp
,
strings
1300
x8258
922B
Magic Forest
brute force
1300
x8278
567B
Berland National Library
implementation
1300
x8329
416B
Art Union
brute force
,
dp
,
implementation
1300
x8458
1786B
Cake Assembly Line
brute force
,
sortings
1300
x8581
1062A
A Prank
greedy
,
implementation
1300
x8646
876B
Divisiblity of Differences
implementation
,
math
,
number theory
1300
x8675
681B
Economy Game
brute force
1300
x8745
347A
Difference Row
constructive algorithms
,
implementation
,
sortings
1300
x8750
946C
String Transformation
greedy
,
strings
1300
x8756
1152B
Neko Performs Cat Furrier Transform
bitmasks
,
constructive algorithms
,
dfs and similar
,
math
1300
x8779
740A
Alyona and copybooks
brute force
,
implementation
1300
x8805
919C
Seat Arrangements
brute force
,
implementation
1300
x8808
996B
World Cup
binary search
,
math
1300
x8845
437A
The Child and Homework
implementation
1300
x8872
670C
Cinema
implementation
,
sortings
1300
x8910
1315B
Homecoming
binary search
,
dp
,
greedy
,
strings
1300
x8928
796B
Find The Bone
implementation
1300
x8944
870C
Maximum splitting
dp
,
greedy
,
math
,
number theory
1300
x8950
1155C
Alarm Clocks Everywhere
math
,
number theory
1300
x9048
665C
Simple Strings
dp
,
greedy
,
strings
1300
x9108
1737B
Ela's Fitness and the Luxury Number
binary search
,
implementation
,
math
1300
x9156
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x9160
1004B
Sonya and Exhibition
constructive algorithms
,
greedy
,
implementation
,
math
1300
x9199
1016B
Segment Occurrences
brute force
,
implementation
1300
x9220
1093C
Mishka and the Last Exam
greedy
1300
x9273
1030C
Vasya and Golden Ticket
implementation
1300
x9304
777B
Game of Credit Cards
data structures
,
dp
,
greedy
,
sortings
1300
x9326
1038C
Gambling
greedy
,
sortings
1300
x9329
750B
New Year and North Pole
geometry
,
implementation
1300
x9419
509B
Painting Pebbles
constructive algorithms
,
greedy
,
implementation
1300
x9511
1107C
Brutality
greedy
,
sortings
,
two pointers
1300
x9638
611B
New Year and Old Property
bitmasks
,
brute force
,
implementation
1300
x9752
1119B
Alyona and a Narrow Fridge
binary search
,
flows
,
greedy
,
sortings
1300
x9775
1236C
Labs
constructive algorithms
,
greedy
,
implementation
1300
x9805
1220C
Substring Game in the Lesson
games
,
greedy
,
strings
1300
x9887
429A
Xor-tree
dfs and similar
,
trees
1300
x9963
1194B
Yet Another Crosses Problem
implementation
1300
x10034
1225B2
TV Subscriptions (Hard Version)
implementation
,
two pointers
1300
x10065
192A
Funky Numbers
binary search
,
brute force
,
implementation
1300
x10109
1037B
Reach Median
greedy
1300
x10180
1063A
Oh Those Palindromes
constructive algorithms
,
strings
1300
x10206
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