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Before contest
Educational Codeforces Round 165 (Rated for Div. 2)
26:55:28
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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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Problems
#
Name
427A
Police Recruits
implementation
800
x72199
230A
Dragons
greedy
,
sortings
1000
x74085
337A
Puzzles
greedy
900
x75349
510A
Fox And Snake
implementation
800
x76665
4C
Registration System
data structures
,
hashing
,
implementation
1300
x76788
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x77657
1335A
Candies and Two Sisters
math
800
x78391
268A
Games
brute force
800
x80661
25A
IQ test
brute force
1300
x80864
131A
cAPS lOCK
implementation
,
strings
1000
x81006
785A
Anton and Polyhedrons
implementation
,
strings
800
x81898
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x82244
208A
Dubstep
strings
900
x83280
443A
Anton and Letters
constructive algorithms
,
implementation
800
x83617
580A
Kefa and First Steps
brute force
,
dp
,
implementation
900
x83720
996A
Hit the Lottery
dp
,
greedy
800
x83915
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x86863
479A
Expression
brute force
,
math
1000
x88352
144A
Arrival of the General
implementation
800
x88693
520A
Pangram
implementation
,
strings
800
x89427
469A
I Wanna Be the Guy
greedy
,
implementation
800
x91036
1328A
Divisibility Problem
math
800
x92941
405A
Gravity Flip
greedy
,
implementation
,
sortings
900
x94084
705A
Hulk
implementation
800
x99109
133A
HQ9+
implementation
900
x99690
228A
Is your horseshoe on the other hoof?
implementation
800
x101568
61A
Ultra-Fast Mathematician
implementation
800
x103281
318A
Even Odds
math
900
x105814
200B
Drinks
implementation
,
math
800
x107359
136A
Presents
implementation
800
x108742
486A
Calculating Function
implementation
,
math
800
x108966
160A
Twins
greedy
,
sortings
900
x110502
344A
Magnets
implementation
800
x111314
467A
George and Accommodation
implementation
800
x113341
122A
Lucky Division
brute force
,
number theory
1000
x115644
1030A
In Search of an Easy Problem
implementation
800
x119407
58A
Chat room
greedy
,
strings
1000
x121836
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x126339
271A
Beautiful Year
brute force
800
x127065
677A
Vanya and Fence
implementation
800
x130083
116A
Tram
implementation
800
x131618
41A
Translation
implementation
,
strings
800
x134397
734A
Anton and Danik
implementation
,
strings
800
x139533
110A
Nearly Lucky Number
implementation
800
x141985
96A
Football
implementation
,
strings
900
x148595
977A
Wrong Subtraction
implementation
800
x154278
69A
Young Physicist
implementation
,
math
1000
x154566
59A
Word
implementation
,
strings
800
x161345
546A
Soldier and Bananas
brute force
,
implementation
,
math
800
x166962
617A
Elephant
math
800
x169446
266A
Stones on the Table
implementation
800
x177417
791A
Bear and Big Brother
implementation
800
x178102
118A
String Task
implementation
,
strings
1000
x180724
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x192478
281A
Word Capitalization
implementation
,
strings
800
x195395
339A
Helpful Maths
greedy
,
implementation
,
sortings
,
strings
800
x197530
112A
Petya and Strings
implementation
,
strings
800
x208439
263A
Beautiful Matrix
implementation
800
x223845
50A
Domino piling
greedy
,
math
800
x227979
158A
Next Round
*special problem
,
implementation
800
x231744
282A
Bit++
implementation
800
x235099
1A
Theatre Square
math
1000
x245106
231A
Team
brute force
,
greedy
800
x298116
71A
Way Too Long Words
strings
800
x352316
4A
Watermelon
brute force
,
math
800
x479709
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