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Before contest
Codeforces Round 941 (Div. 1)
31:42:22
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Before contest
Codeforces Round 941 (Div. 2)
31:42:21
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→ Filter Problems
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combine-tags-by-or
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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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Custom test
Problems
#
Name
4A
Watermelon
brute force
,
math
800
x479317
71A
Way Too Long Words
strings
800
x352002
231A
Team
brute force
,
greedy
800
x297854
1A
Theatre Square
math
1000
x244953
282A
Bit++
implementation
800
x234863
158A
Next Round
*special problem
,
implementation
800
x231572
50A
Domino piling
greedy
,
math
800
x227796
263A
Beautiful Matrix
implementation
800
x223630
112A
Petya and Strings
implementation
,
strings
800
x208261
339A
Helpful Maths
greedy
,
implementation
,
sortings
,
strings
800
x197344
281A
Word Capitalization
implementation
,
strings
800
x195234
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x192287
118A
String Task
implementation
,
strings
1000
x180611
791A
Bear and Big Brother
implementation
800
x177912
266A
Stones on the Table
implementation
800
x177197
617A
Elephant
math
800
x169296
546A
Soldier and Bananas
brute force
,
implementation
,
math
800
x166737
59A
Word
implementation
,
strings
800
x161200
69A
Young Physicist
implementation
,
math
1000
x154461
977A
Wrong Subtraction
implementation
800
x154145
96A
Football
implementation
,
strings
900
x148482
110A
Nearly Lucky Number
implementation
800
x141860
734A
Anton and Danik
implementation
,
strings
800
x139352
41A
Translation
implementation
,
strings
800
x134278
116A
Tram
implementation
800
x131524
677A
Vanya and Fence
implementation
800
x129934
271A
Beautiful Year
brute force
800
x126971
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x126272
58A
Chat room
greedy
,
strings
1000
x121765
1030A
In Search of an Easy Problem
implementation
800
x119303
122A
Lucky Division
brute force
,
number theory
1000
x115566
467A
George and Accommodation
implementation
800
x113266
344A
Magnets
implementation
800
x111209
160A
Twins
greedy
,
sortings
900
x110428
486A
Calculating Function
implementation
,
math
800
x108879
136A
Presents
implementation
800
x108654
200B
Drinks
implementation
,
math
800
x107287
318A
Even Odds
math
900
x105726
61A
Ultra-Fast Mathematician
implementation
800
x103216
228A
Is your horseshoe on the other hoof?
implementation
800
x101485
133A
HQ9+
implementation
900
x99637
705A
Hulk
implementation
800
x99028
405A
Gravity Flip
greedy
,
implementation
,
sortings
900
x93990
1328A
Divisibility Problem
math
800
x92846
469A
I Wanna Be the Guy
greedy
,
implementation
800
x90963
520A
Pangram
implementation
,
strings
800
x89347
144A
Arrival of the General
implementation
800
x88636
479A
Expression
brute force
,
math
1000
x88296
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x86808
996A
Hit the Lottery
dp
,
greedy
800
x83844
580A
Kefa and First Steps
brute force
,
dp
,
implementation
900
x83666
443A
Anton and Letters
constructive algorithms
,
implementation
800
x83547
208A
Dubstep
strings
900
x83216
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x82203
785A
Anton and Polyhedrons
implementation
,
strings
800
x81807
131A
cAPS lOCK
implementation
,
strings
1000
x80955
25A
IQ test
brute force
1300
x80811
268A
Games
brute force
800
x80603
1335A
Candies and Two Sisters
math
800
x78342
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x77604
4C
Registration System
data structures
,
hashing
,
implementation
1300
x76724
510A
Fox And Snake
implementation
800
x76570
337A
Puzzles
greedy
900
x75300
230A
Dragons
greedy
,
sortings
1000
x74021
427A
Police Recruits
implementation
800
x72142
1352A
Sum of Round Numbers
implementation
,
math
800
x71475
492B
Vanya and Lanterns
binary search
,
implementation
,
math
,
sortings
1200
x70881
750A
New Year and Hurry
binary search
,
brute force
,
implementation
,
math
800
x70527
155A
I_love_\%username\%
brute force
800
x70371
723A
The New Year: Meeting Friends
implementation
,
math
,
sortings
800
x70369
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x69588
732A
Buy a Shovel
brute force
,
constructive algorithms
,
implementation
,
math
800
x66953
581A
Vasya the Hipster
implementation
,
math
800
x66880
339B
Xenia and Ringroad
implementation
1000
x66210
1154A
Restoring Three Numbers
math
800
x66125
151A
Soft Drinking
implementation
,
math
800
x65432
1742A
Sum
implementation
800
x64101
1399A
Remove Smallest
greedy
,
sortings
800
x62481
451A
Game With Sticks
implementation
900
x62434
1409A
Yet Another Two Integers Problem
greedy
,
math
800
x62272
189A
Cut Ribbon
brute force
,
dp
1300
x62242
1703A
YES or YES?
brute force
,
implementation
,
strings
800
x62111
630A
Again Twenty Five!
number theory
800
x61612
381A
Sereja and Dima
greedy
,
implementation
,
two pointers
800
x59932
1512A
Spy Detected!
brute force
,
implementation
800
x59629
466A
Cheap Travel
implementation
1200
x59319
1692A
Marathon
implementation
800
x59310
32B
Borze
expression parsing
,
implementation
800
x58406
706B
Interesting drink
binary search
,
dp
,
implementation
1100
x58064
1676A
Lucky?
implementation
800
x57613
758A
Holiday Of Equality
implementation
,
math
800
x57021
472A
Design Tutorial: Learn from Math
math
,
number theory
800
x56822
1669A
Division?
implementation
800
x56655
432A
Choosing Teams
greedy
,
implementation
,
sortings
800
x56467
579A
Raising Bacteria
bitmasks
1000
x55824
1560A
Dislike of Threes
implementation
800
x55629
1807A
Plus or Minus
implementation
800
x55261
490A
Team Olympiad
greedy
,
implementation
,
sortings
800
x55253
1475A
Odd Divisor
math
,
number theory
900
x54833
1367A
Short Substrings
implementation
,
strings
800
x54657
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