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Educational Codeforces Round 167 (Rated for Div. 2)
21:19:38
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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
1006B
Polycarp's Practice
greedy
,
implementation
,
sortings
1200
x12938
1002D1
Oracle for f(x) = b * x mod 2
1200
x399
1001H
Oracle for f(x) = parity of the number of 1s in x
*special problem
1200
x527
1000A
Codehorses T-shirts
greedy
,
implementation
1200
x8632
999C
Alphabetic Removals
implementation
1200
x17610
998B
Cutting
dp
,
greedy
,
sortings
1200
x12851
990B
Micro-World
greedy
,
sortings
1200
x8004
989B
A Tide of Riverscape
constructive algorithms
,
strings
1200
x6999
985B
Switches and Lamps
implementation
1200
x7332
982A
Row
brute force
,
constructive algorithms
1200
x8987
977C
Less or Equal
sortings
1200
x33008
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x19681
960A
Check the string
implementation
1200
x8091
959B
Mahmoud and Ehab and the message
dsu
,
greedy
,
implementation
1200
x9209
958C1
Encryption (easy)
brute force
1200
x2808
940A
Points on the line
brute force
,
greedy
,
sortings
1200
x8193
934B
A Prosperous Lot
constructive algorithms
,
implementation
1200
x8564
931B
World Cup
constructive algorithms
,
implementation
1200
x7061
928A
Login Verification
*special problem
,
strings
1200
x3354
920B
Tea Queue
implementation
1200
x7143
914B
Conan and Agasa play a Card Game
games
,
greedy
,
implementation
1200
x8531
913B
Christmas Spruce
implementation
,
trees
1200
x15608
911B
Two Cakes
binary search
,
brute force
,
implementation
1200
x11101
908B
New Year and Buggy Bot
brute force
,
implementation
1200
x7602
903C
Boxes Packing
greedy
1200
x16686
903B
The Modcrab
greedy
,
implementation
1200
x7605
902B
Coloring a Tree
dfs and similar
,
dsu
,
greedy
1200
x10574
899B
Months and Years
implementation
1200
x5787
895A
Pizza Separation
brute force
,
implementation
1200
x6483
892B
Wrath
greedy
,
implementation
,
two pointers
1200
x8735
879B
Table Tennis
data structures
,
implementation
1200
x12038
875A
Classroom Watch
brute force
,
math
1200
x9511
870B
Maximum of Maximums of Minimums
greedy
1200
x9218
854B
Maxim Buys an Apartment
constructive algorithms
,
math
1200
x8147
842A
Kirill And The Game
brute force
,
two pointers
1200
x10029
828A
Restaurant Tables
implementation
1200
x7842
817A
Treasure Hunt
implementation
,
math
,
number theory
1200
x6092
812A
Sagheer and Crossroads
implementation
1200
x6181
811B
Vladik and Complicated Book
implementation
,
sortings
1200
x6448
803B
Distances to Zero
constructive algorithms
1200
x6445
802M
April Fools' Problem (easy)
greedy
,
sortings
1200
x3042
794B
Cutting Carrot
geometry
,
math
1200
x6378
787A
The Monster
brute force
,
math
,
number theory
1200
x11114
779C
Dishonest Sellers
constructive algorithms
,
greedy
,
sortings
1200
x11676
776B
Sherlock and his girlfriend
constructive algorithms
,
number theory
1200
x19843
774C
Maximum Number
*special problem
,
constructive algorithms
,
greedy
,
implementation
1200
x4047
769B
News About Credit
*special problem
,
greedy
,
two pointers
1200
x3248
765C
Table Tennis Game 2
math
1200
x6872
754A
Lesha and array splitting
constructive algorithms
,
greedy
,
implementation
1200
x8571
749B
Parallelogram is Back
brute force
,
constructive algorithms
,
geometry
1200
x8433
743B
Chloe and the sequence
binary search
,
bitmasks
,
constructive algorithms
,
implementation
1200
x14377
743A
Vladik and flights
constructive algorithms
,
greedy
,
implementation
1200
x10885
740B
Alyona and flowers
constructive algorithms
1200
x8184
732C
Sanatorium
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
1200
x9488
729B
Spotlights
dp
,
implementation
1200
x7770
725B
Food on the Plane
implementation
,
math
1200
x5103
722B
Verse Pattern
implementation
,
strings
1200
x6362
717C
Potions Homework
implementation
,
sortings
1200
x3909
714B
Filya and Homework
implementation
,
sortings
1200
x14124
708A
Letters Cyclic Shift
constructive algorithms
,
greedy
,
implementation
,
strings
1200
x8937
701B
Cells Not Under Attack
data structures
,
math
1200
x11605
690D1
The Wall (easy)
1200
x2573
683A
The Check of the Point
*special problem
,
geometry
1200
x787
682B
Alyona and Mex
sortings
1200
x11162
660A
Co-prime Array
greedy
,
implementation
,
math
,
number theory
1200
x8624
659C
Tanya and Toys
greedy
,
implementation
1200
x11404
651B
Beautiful Paintings
greedy
,
sortings
1200
x11424
645B
Mischievous Mess Makers
greedy
,
math
1200
x3345
645A
Amity Assessment
brute force
,
constructive algorithms
,
implementation
1200
x3398
639A
Bear and Displayed Friends
implementation
1200
x6102
637B
Chat Order
*special problem
,
binary search
,
constructive algorithms
,
data structures
,
sortings
1200
x15383
632A
Grandma Laura and Apples
1200
x4513
631B
Print Check
constructive algorithms
,
implementation
1200
x7275
630R
Game
games
,
math
1200
x8440
630B
Moore's Law
math
1200
x7193
625B
War of the Corporations
constructive algorithms
,
greedy
,
strings
1200
x10189
612B
HDD is Outdated Technology
implementation
,
math
1200
x6874
606A
Magic Spheres
implementation
1200
x7756
593A
2Char
brute force
,
implementation
1200
x5688
592A
PawnChess
implementation
1200
x6314
591B
Rebranding
implementation
,
strings
1200
x8154
583B
Robot's Task
greedy
,
implementation
1200
x8644
574A
Bear and Elections
greedy
,
implementation
1200
x9022
569B
Inventory
greedy
,
math
1200
x6986
560B
Gerald is into Art
constructive algorithms
,
implementation
1200
x7857
554B
Ohana Cleans Up
brute force
,
greedy
,
strings
1200
x9762
552B
Vanya and Books
implementation
,
math
1200
x15276
546B
Soldier and Badges
brute force
,
greedy
,
implementation
,
sortings
1200
x17344
523A
Rotate, Flip and Zoom
*special problem
,
implementation
1200
x2599
522A
Reposts
*special problem
,
dfs and similar
,
dp
,
graphs
,
trees
1200
x15859
514A
Chewbaсca and Number
greedy
,
implementation
1200
x47763
492B
Vanya and Lanterns
binary search
,
implementation
,
math
,
sortings
1200
x72525
489B
BerSU Ball
dfs and similar
,
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
1200
x47249
489A
SwapSort
greedy
,
implementation
,
sortings
1200
x9876
482A
Diverse Permutation
constructive algorithms
,
greedy
1200
x9556
474B
Worms
binary search
,
implementation
1200
x45771
466A
Cheap Travel
implementation
1200
x60760
463A
Caisa and Sugar
brute force
,
implementation
1200
x9128
461A
Appleman and Toastman
greedy
,
sortings
1200
x15283
459A
Pashmak and Garden
implementation
1200
x31818
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