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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
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geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
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probabilities
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Custom test
Problems
#
Name
4A
Watermelon
brute force
,
math
800
x478767
71A
Way Too Long Words
strings
800
x351581
231A
Team
brute force
,
greedy
800
x297483
282A
Bit++
implementation
800
x234575
158A
Next Round
*special problem
,
implementation
800
x231348
50A
Domino piling
greedy
,
math
800
x227568
263A
Beautiful Matrix
implementation
800
x223361
112A
Petya and Strings
implementation
,
strings
800
x208028
339A
Helpful Maths
greedy
,
implementation
,
sortings
,
strings
800
x197115
281A
Word Capitalization
implementation
,
strings
800
x195031
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x192012
791A
Bear and Big Brother
implementation
800
x177640
266A
Stones on the Table
implementation
800
x176972
617A
Elephant
math
800
x169031
546A
Soldier and Bananas
brute force
,
implementation
,
math
800
x166540
59A
Word
implementation
,
strings
800
x161004
977A
Wrong Subtraction
implementation
800
x153976
110A
Nearly Lucky Number
implementation
800
x141716
734A
Anton and Danik
implementation
,
strings
800
x139116
41A
Translation
implementation
,
strings
800
x134067
116A
Tram
implementation
800
x131417
677A
Vanya and Fence
implementation
800
x129742
271A
Beautiful Year
brute force
800
x126822
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x126173
1030A
In Search of an Easy Problem
implementation
800
x119111
467A
George and Accommodation
implementation
800
x113160
344A
Magnets
implementation
800
x111065
486A
Calculating Function
implementation
,
math
800
x108753
136A
Presents
implementation
800
x108523
200B
Drinks
implementation
,
math
800
x107158
61A
Ultra-Fast Mathematician
implementation
800
x103112
228A
Is your horseshoe on the other hoof?
implementation
800
x101366
705A
Hulk
implementation
800
x98924
1328A
Divisibility Problem
math
800
x92735
469A
I Wanna Be the Guy
greedy
,
implementation
800
x90867
520A
Pangram
implementation
,
strings
800
x89215
144A
Arrival of the General
implementation
800
x88556
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x86743
996A
Hit the Lottery
dp
,
greedy
800
x83751
443A
Anton and Letters
constructive algorithms
,
implementation
800
x83451
785A
Anton and Polyhedrons
implementation
,
strings
800
x81698
268A
Games
brute force
800
x80501
1335A
Candies and Two Sisters
math
800
x78247
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x77530
510A
Fox And Snake
implementation
800
x76391
427A
Police Recruits
implementation
800
x72033
1352A
Sum of Round Numbers
implementation
,
math
800
x71349
750A
New Year and Hurry
binary search
,
brute force
,
implementation
,
math
800
x70445
155A
I_love_\%username\%
brute force
800
x70298
723A
The New Year: Meeting Friends
implementation
,
math
,
sortings
800
x70262
732A
Buy a Shovel
brute force
,
constructive algorithms
,
implementation
,
math
800
x66846
581A
Vasya the Hipster
implementation
,
math
800
x66804
1154A
Restoring Three Numbers
math
800
x66046
151A
Soft Drinking
implementation
,
math
800
x65338
1742A
Sum
implementation
800
x63986
1399A
Remove Smallest
greedy
,
sortings
800
x62413
1409A
Yet Another Two Integers Problem
greedy
,
math
800
x62211
1703A
YES or YES?
brute force
,
implementation
,
strings
800
x61974
630A
Again Twenty Five!
number theory
800
x61515
381A
Sereja and Dima
greedy
,
implementation
,
two pointers
800
x59812
1512A
Spy Detected!
brute force
,
implementation
800
x59530
1692A
Marathon
implementation
800
x59209
32B
Borze
expression parsing
,
implementation
800
x58334
1676A
Lucky?
implementation
800
x57529
758A
Holiday Of Equality
implementation
,
math
800
x56949
472A
Design Tutorial: Learn from Math
math
,
number theory
800
x56778
1669A
Division?
implementation
800
x56559
432A
Choosing Teams
greedy
,
implementation
,
sortings
800
x56408
1560A
Dislike of Threes
implementation
800
x55576
490A
Team Olympiad
greedy
,
implementation
,
sortings
800
x55197
1807A
Plus or Minus
implementation
800
x55155
1367A
Short Substrings
implementation
,
strings
800
x54618
1791A
Codeforces Checking
implementation
,
strings
800
x54408
1343B
Balanced Array
constructive algorithms
,
math
800
x53453
703A
Mishka and Game
implementation
800
x53333
1760A
Medium Number
implementation
,
sortings
800
x53101
9A
Die Roll
math
,
probabilities
800
x52216
431A
Black Square
implementation
800
x51130
1850A
To My Critics
implementation
,
sortings
800
x50517
1374A
Required Remainder
math
800
x50399
1367B
Even Array
greedy
,
math
800
x50027
1624A
Plus One on the Subset
math
800
x49542
1520A
Do Not Be Distracted!
brute force
,
implementation
800
x49408
80A
Panoramix's Prediction
brute force
800
x49230
1433A
Boring Apartments
implementation
,
math
800
x49074
1915A
Odd One Out
bitmasks
,
implementation
800
x48916
1370A
Maximum GCD
greedy
,
implementation
,
math
,
number theory
800
x48507
1873A
Short Sort
brute force
,
implementation
800
x48157
1551A
Polycarp and Coins
greedy
,
math
800
x48155
1619A
Square String?
implementation
,
strings
800
x47995
1360A
Minimal Square
greedy
,
math
800
x47837
1353B
Two Arrays And Swaps
greedy
,
sortings
800
x47379
1472B
Fair Division
dp
,
greedy
,
math
800
x47256
1722A
Spell Check
implementation
800
x46480
492A
Vanya and Cubes
implementation
800
x46462
1283A
Minutes Before the New Year
math
800
x46309
749A
Bachgold Problem
greedy
,
implementation
,
math
,
number theory
800
x46262
1535A
Fair Playoff
brute force
,
implementation
800
x46076
707A
Brain's Photos
implementation
800
x45965
1360B
Honest Coach
greedy
,
sortings
800
x45874
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