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Before contest
Codeforces Round 941 (Div. 1)
2 days
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Before contest
Codeforces Round 941 (Div. 2)
2 days
Register now »
*has extra registration
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implementation
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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Status
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Custom test
Problems
#
Name
1070K
Video Posts
implementation
1100
x4826
312A
Whose sentence is it?
implementation
,
strings
1100
x4845
813A
The Contest
implementation
1100
x5007
245B
Internet Address
implementation
,
strings
1100
x5118
90B
African Crossword
implementation
,
strings
1100
x5144
252A
Little Xor
brute force
,
implementation
1100
x5155
12C
Fruits
greedy
,
implementation
,
sortings
1100
x5704
103A
Testing Pants for Sadness
greedy
,
implementation
,
math
1100
x5853
192B
Walking in the Rain
brute force
,
implementation
1100
x6137
242A
Heads or Tails
brute force
,
implementation
1100
x6228
257A
Sockets
greedy
,
implementation
,
sortings
1100
x6374
381B
Sereja and Stairs
greedy
,
implementation
,
sortings
1100
x6573
505A
Mr. Kitayuta's Gift
brute force
,
implementation
,
strings
1100
x6587
975B
Mancala
brute force
,
implementation
1100
x6733
884B
Japanese Crosswords Strike Back
implementation
1100
x6792
389B
Fox and Cross
greedy
,
implementation
1100
x6809
765B
Code obfuscation
greedy
,
implementation
,
strings
1100
x7015
1121A
Technogoblet of Fire
implementation
,
sortings
1100
x7087
754B
Ilya and tic-tac-toe game
brute force
,
implementation
1100
x7143
984B
Minesweeper
implementation
1100
x7251
950B
Intercepted Message
greedy
,
implementation
1100
x7293
825A
Binary Protocol
implementation
1100
x7523
596A
Wilbur and Swimming Pool
geometry
,
implementation
1100
x7594
845A
Chess Tourney
implementation
,
sortings
1100
x7625
686B
Little Robber Girl's Zoo
constructive algorithms
,
implementation
,
sortings
1100
x7696
544A
Set of Strings
implementation
,
strings
1100
x7714
556B
Case of Fake Numbers
brute force
,
implementation
1100
x7869
12B
Correct Solution?
implementation
,
sortings
1100
x7946
985A
Chess Placing
implementation
1100
x8061
557A
Ilya and Diplomas
greedy
,
implementation
,
math
1100
x8197
495A
Digital Counter
implementation
1100
x8287
1146B
Hate "A"
implementation
,
strings
1100
x8305
602A
Two Bases
brute force
,
implementation
1100
x8346
834B
The Festive Evening
data structures
,
implementation
1100
x8506
522B
Photo to Remember
*special problem
,
data structures
,
dp
,
implementation
1100
x8640
289A
Polo the Penguin and Segments
brute force
,
implementation
1100
x8668
792A
New Bus Route
implementation
,
sortings
1100
x8719
609B
The Best Gift
constructive algorithms
,
implementation
1100
x8783
121A
Lucky Sum
implementation
1100
x8795
218A
Mountain Scenery
brute force
,
constructive algorithms
,
implementation
1100
x8860
347B
Fixed Points
brute force
,
implementation
,
math
1100
x9130
789A
Anastasia and pebbles
implementation
,
math
1100
x9211
898B
Proper Nutrition
brute force
,
implementation
,
number theory
1100
x9246
355A
Vasya and Digital Root
constructive algorithms
,
implementation
1100
x9256
25B
Phone numbers
implementation
1100
x9261
869A
The Artful Expedient
brute force
,
implementation
1100
x9349
1132A
Regular Bracket Sequence
greedy
,
implementation
1100
x9414
712B
Memory and Trident
implementation
,
strings
1100
x9601
902A
Visiting a Friend
greedy
,
implementation
1100
x9676
1105B
Zuhair and Strings
brute force
,
implementation
,
strings
1100
x9785
548A
Mike and Fax
brute force
,
implementation
,
strings
1100
x9830
723B
Text Document Analysis
expression parsing
,
implementation
,
strings
1100
x9988
758B
Blown Garland
brute force
,
implementation
,
number theory
1100
x10030
558A
Lala Land and Apple Trees
brute force
,
implementation
,
sortings
1100
x10153
596B
Wilbur and Array
greedy
,
implementation
1100
x10184
1119A
Ilya and a Colorful Walk
greedy
,
implementation
1100
x10392
714A
Meeting of Old Friends
implementation
,
math
1100
x10669
877A
Alex and broken contest
implementation
,
strings
1100
x10684
1117A
Best Subsegment
implementation
,
math
1100
x10748
1105A
Salem and Sticks
brute force
,
implementation
1100
x10766
911A
Nearest Minimums
implementation
1100
x11277
1609B
William the Vigilant
implementation
,
strings
1100
x11493
1413B
A New Technique
implementation
1100
x11595
1255B
Fridge Lockers
graphs
,
implementation
1100
x11666
382A
Ksenia and Pan Scales
greedy
,
implementation
1100
x11727
721B
Passwords
implementation
,
math
,
sortings
,
strings
1100
x11964
534A
Exam
constructive algorithms
,
implementation
,
math
1100
x12004
6B
President's Office
implementation
1100
x12081
1534B
Histogram Ugliness
greedy
,
implementation
,
math
1100
x12346
1670B
Dorms War
brute force
,
implementation
,
strings
1100
x12401
1042A
Benches
binary search
,
implementation
1100
x12480
1421B
Putting Bricks in the Wall
constructive algorithms
,
implementation
1100
x12871
581B
Luxurious Houses
implementation
,
math
1100
x12878
1672C
Unequal Array
constructive algorithms
,
greedy
,
implementation
1100
x12901
285A
Slightly Decreasing Permutations
greedy
,
implementation
1100
x13074
1863C
MEX Repetition
implementation
,
math
1100
x13309
471A
MUH and Sticks
implementation
1100
x13312
116B
Little Pigs and Wolves
greedy
,
implementation
1100
x13396
362B
Petya and Staircases
implementation
,
sortings
1100
x13483
1165A
Remainder
implementation
,
math
1100
x13514
259B
Little Elephant and Magic Square
brute force
,
implementation
1100
x13663
427B
Prison Transfer
data structures
,
implementation
1100
x13679
570A
Elections
implementation
1100
x13727
1602B
Divine Array
constructive algorithms
,
implementation
1100
x13811
1623B
Game on Ranges
brute force
,
dfs and similar
,
implementation
,
sortings
1100
x13889
797A
k-Factorization
implementation
,
math
,
number theory
1100
x13901
365B
The Fibonacci Segment
implementation
1100
x14004
527A
Playing with Paper
implementation
,
math
1100
x14079
1717B
Madoka and Underground Competitions
constructive algorithms
,
implementation
1100
x14461
1293A
ConneR and the A.R.C. Markland-N
binary search
,
brute force
,
implementation
1100
x14954
242B
Big Segment
implementation
,
sortings
1100
x15171
1157A
Reachable Numbers
implementation
1100
x15356
719A
Vitya in the Countryside
implementation
1100
x15385
43B
Letter
implementation
,
strings
1100
x15624
433A
Kitahara Haruki's Gift
brute force
,
implementation
1100
x15696
218B
Airport
implementation
1100
x15703
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x15970
1762B
Make Array Good
constructive algorithms
,
implementation
,
number theory
,
sortings
1100
x16151
186A
Comparing Strings
implementation
,
strings
1100
x16186
166A
Rank List
binary search
,
implementation
,
sortings
1100
x16707
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