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Educational Codeforces Round 131 (Rated for Div. 2)
39:09:06
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Difficulty:
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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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Custom test
Problems
#
Name
4A
Watermelon
brute force
,
math
800
x309583
71A
Way Too Long Words
strings
800
x227243
231A
Team
brute force
,
greedy
800
x187138
1A
Theatre Square
math
1000
x175531
158A
Next Round
*special problem
,
implementation
800
x154477
50A
Domino piling
greedy
,
math
800
x147785
282A
Bit++
implementation
800
x144907
263A
Beautiful Matrix
implementation
800
x143552
112A
Petya and Strings
implementation
,
strings
800
x138365
118A
String Task
implementation
,
strings
1000
x129511
339A
Helpful Maths
greedy
,
implementation
,
sortings
,
strings
800
x129432
281A
Word Capitalization
implementation
,
strings
800
x125891
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x120143
266A
Stones on the Table
implementation
800
x117793
791A
Bear and Big Brother
implementation
800
x109203
546A
Soldier and Bananas
brute force
,
implementation
,
math
800
x105061
69A
Young Physicist
implementation
,
math
1000
x104937
96A
Football
implementation
,
strings
900
x103295
617A
Elephant
math
800
x102053
59A
Word
implementation
,
strings
800
x100317
977A
Wrong Subtraction
implementation
800
x98300
116A
Tram
implementation
800
x89807
110A
Nearly Lucky Number
implementation
800
x89611
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x88214
58A
Chat room
greedy
,
strings
1000
x86389
734A
Anton and Danik
implementation
,
strings
800
x86291
41A
Translation
implementation
,
strings
800
x86000
122A
Lucky Division
brute force
,
number theory
1000
x82963
271A
Beautiful Year
brute force
800
x82842
677A
Vanya and Fence
implementation
800
x81636
160A
Twins
greedy
,
sortings
900
x79460
467A
George and Accommodation
implementation
800
x75362
1030A
In Search of an Easy Problem
implementation
800
x73966
136A
Presents
implementation
800
x73850
344A
Magnets
implementation
800
x73239
133A
HQ9+
implementation
900
x72143
318A
Even Odds
math
900
x70385
486A
Calculating Function
implementation
,
math
800
x69912
200B
Drinks
implementation
,
math
800
x69435
61A
Ultra-Fast Mathematician
implementation
800
x69092
705A
Hulk
implementation
800
x67210
228A
Is your horseshoe on the other hoof?
implementation
800
x65271
405A
Gravity Flip
greedy
,
implementation
,
sortings
900
x62628
580A
Kefa and First Steps
brute force
,
dp
,
implementation
900
x62450
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x62311
479A
Expression
brute force
,
math
1000
x62298
469A
I Wanna Be the Guy
greedy
,
implementation
800
x61968
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x60645
144A
Arrival of the General
implementation
800
x60339
131A
cAPS lOCK
implementation
,
strings
1000
x60260
208A
Dubstep
strings
900
x59795
1328A
Divisibility Problem
math
800
x59107
443A
Anton and Letters
constructive algorithms
,
implementation
800
x57204
520A
Pangram
implementation
,
strings
800
x56680
337A
Puzzles
greedy
900
x56440
25A
IQ test
brute force
1300
x56111
268A
Games
brute force
800
x56077
996A
Hit the Lottery
dp
,
greedy
800
x54592
785A
Anton and Polyhedrons
implementation
,
strings
800
x53867
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x53529
1335A
Candies and Two Sisters
math
800
x52908
492B
Vanya and Lanterns
binary search
,
implementation
,
math
,
sortings
1200
x51414
230A
Dragons
greedy
,
sortings
1000
x50999
4C
Registration System
data structures
,
hashing
,
implementation
1300
x50469
510A
Fox And Snake
implementation
800
x49708
339B
Xenia and Ringroad
implementation
1000
x49250
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x47942
155A
I_love_\%username\%
brute force
800
x47544
451A
Game With Sticks
implementation
900
x47366
750A
New Year and Hurry
binary search
,
brute force
,
implementation
,
math
800
x47275
427A
Police Recruits
implementation
800
x46664
581A
Vasya the Hipster
implementation
,
math
800
x46328
1352A
Sum of Round Numbers
implementation
,
math
800
x45389
732A
Buy a Shovel
brute force
,
constructive algorithms
,
implementation
,
math
800
x45144
189A
Cut Ribbon
brute force
,
dp
1300
x44785
1154A
Restoring Three Numbers
math
800
x44542
1399A
Remove Smallest
greedy
,
sortings
800
x44504
1409A
Yet Another Two Integers Problem
greedy
,
math
800
x44415
723A
The New Year: Meeting Friends
implementation
,
math
,
sortings
800
x43129
472A
Design Tutorial: Learn from Math
math
,
number theory
800
x42089
466A
Cheap Travel
implementation
1200
x41690
1367A
Short Substrings
implementation
,
strings
800
x41267
432A
Choosing Teams
greedy
,
implementation
,
sortings
800
x40553
455A
Boredom
dp
1500
x40401
1343B
Balanced Array
constructive algorithms
,
math
800
x40339
758A
Holiday Of Equality
implementation
,
math
800
x39287
490A
Team Olympiad
greedy
,
implementation
,
sortings
800
x39246
151A
Soft Drinking
implementation
,
math
800
x38646
313A
Ilya and Bank Account
implementation
,
number theory
900
x38467
1512A
Spy Detected!
brute force
,
implementation
800
x38075
706B
Interesting drink
binary search
,
dp
,
implementation
1100
x37798
500A
New Year Transportation
dfs and similar
,
graphs
,
implementation
1000
x37498
1374A
Required Remainder
math
800
x37456
1353B
Two Arrays And Swaps
greedy
,
sortings
800
x37229
1367B
Even Array
greedy
,
math
800
x37194
579A
Raising Bacteria
bitmasks
1000
x37178
703A
Mishka and Game
implementation
800
x37063
1560A
Dislike of Threes
implementation
800
x36915
1360A
Minimal Square
greedy
,
math
800
x36891
1520A
Do Not Be Distracted!
brute force
,
implementation
800
x36806
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