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Before contest
Codeforces Round (Div. 2)
4 days
→ Filter Problems
Difficulty:
—
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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Problems
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Status
Standings
Custom test
Problems
#
Name
4A
Watermelon
brute force
,
math
800
x391588
71A
Way Too Long Words
strings
800
x287898
231A
Team
brute force
,
greedy
800
x242281
1A
Theatre Square
math
1000
x209085
158A
Next Round
*special problem
,
implementation
800
x192645
50A
Domino piling
greedy
,
math
800
x187897
282A
Bit++
implementation
800
x186469
263A
Beautiful Matrix
implementation
800
x183636
112A
Petya and Strings
implementation
,
strings
800
x172870
339A
Helpful Maths
greedy
,
implementation
,
sortings
,
strings
800
x163161
281A
Word Capitalization
implementation
,
strings
800
x160678
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x156368
118A
String Task
implementation
,
strings
1000
x154496
266A
Stones on the Table
implementation
800
x147500
791A
Bear and Big Brother
implementation
800
x143225
546A
Soldier and Bananas
brute force
,
implementation
,
math
800
x135155
617A
Elephant
math
800
x134534
59A
Word
implementation
,
strings
800
x130811
69A
Young Physicist
implementation
,
math
1000
x129754
977A
Wrong Subtraction
implementation
800
x125601
96A
Football
implementation
,
strings
900
x125130
110A
Nearly Lucky Number
implementation
800
x115254
734A
Anton and Danik
implementation
,
strings
800
x113267
116A
Tram
implementation
800
x110728
41A
Translation
implementation
,
strings
800
x109932
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x107220
677A
Vanya and Fence
implementation
800
x105715
271A
Beautiful Year
brute force
800
x104614
58A
Chat room
greedy
,
strings
1000
x103915
122A
Lucky Division
brute force
,
number theory
1000
x99254
1030A
In Search of an Easy Problem
implementation
800
x96256
160A
Twins
greedy
,
sortings
900
x94937
467A
George and Accommodation
implementation
800
x93977
344A
Magnets
implementation
800
x91672
136A
Presents
implementation
800
x91419
486A
Calculating Function
implementation
,
math
800
x88838
200B
Drinks
implementation
,
math
800
x88190
318A
Even Odds
math
900
x87663
61A
Ultra-Fast Mathematician
implementation
800
x86092
133A
HQ9+
implementation
900
x85668
705A
Hulk
implementation
800
x83472
228A
Is your horseshoe on the other hoof?
implementation
800
x83078
405A
Gravity Flip
greedy
,
implementation
,
sortings
900
x78196
469A
I Wanna Be the Guy
greedy
,
implementation
800
x76460
479A
Expression
brute force
,
math
1000
x75146
1328A
Divisibility Problem
math
800
x74692
144A
Arrival of the General
implementation
800
x74634
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x73321
580A
Kefa and First Steps
brute force
,
dp
,
implementation
900
x72546
520A
Pangram
implementation
,
strings
800
x72424
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x72133
208A
Dubstep
strings
900
x71600
131A
cAPS lOCK
implementation
,
strings
1000
x70418
443A
Anton and Letters
constructive algorithms
,
implementation
800
x70336
25A
IQ test
brute force
1300
x68644
996A
Hit the Lottery
dp
,
greedy
800
x68522
268A
Games
brute force
800
x68503
785A
Anton and Polyhedrons
implementation
,
strings
800
x67443
337A
Puzzles
greedy
900
x65941
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x65568
1335A
Candies and Two Sisters
math
800
x65131
4C
Registration System
data structures
,
hashing
,
implementation
1300
x63187
510A
Fox And Snake
implementation
800
x62861
230A
Dragons
greedy
,
sortings
1000
x62354
492B
Vanya and Lanterns
binary search
,
implementation
,
math
,
sortings
1200
x61302
427A
Police Recruits
implementation
800
x59539
155A
I_love_\%username\%
brute force
800
x59185
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x58406
750A
New Year and Hurry
binary search
,
brute force
,
implementation
,
math
800
x58129
339B
Xenia and Ringroad
implementation
1000
x57634
1352A
Sum of Round Numbers
implementation
,
math
800
x57262
581A
Vasya the Hipster
implementation
,
math
800
x56856
723A
The New Year: Meeting Friends
implementation
,
math
,
sortings
800
x56415
732A
Buy a Shovel
brute force
,
constructive algorithms
,
implementation
,
math
800
x56182
451A
Game With Sticks
implementation
900
x54972
1154A
Restoring Three Numbers
math
800
x54641
1399A
Remove Smallest
greedy
,
sortings
800
x53316
1409A
Yet Another Two Integers Problem
greedy
,
math
800
x53175
189A
Cut Ribbon
brute force
,
dp
1300
x53099
151A
Soft Drinking
implementation
,
math
800
x51467
466A
Cheap Travel
implementation
1200
x50477
472A
Design Tutorial: Learn from Math
math
,
number theory
800
x49537
432A
Choosing Teams
greedy
,
implementation
,
sortings
800
x48635
1367A
Short Substrings
implementation
,
strings
800
x48190
1512A
Spy Detected!
brute force
,
implementation
800
x48170
758A
Holiday Of Equality
implementation
,
math
800
x47880
381A
Sereja and Dima
greedy
,
implementation
,
two pointers
800
x47657
490A
Team Olympiad
greedy
,
implementation
,
sortings
800
x47493
1343B
Balanced Array
constructive algorithms
,
math
800
x47173
455A
Boredom
dp
1500
x46964
630A
Again Twenty Five!
number theory
800
x46909
706B
Interesting drink
binary search
,
dp
,
implementation
1100
x46751
32B
Borze
expression parsing
,
implementation
800
x46700
1560A
Dislike of Threes
implementation
800
x46275
1703A
YES or YES?
brute force
,
implementation
,
strings
800
x45907
579A
Raising Bacteria
bitmasks
1000
x45901
313A
Ilya and Bank Account
implementation
,
number theory
900
x45788
703A
Mishka and Game
implementation
800
x45199
1742A
Sum
implementation
800
x44954
1475A
Odd Divisor
math
,
number theory
900
x44740
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