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Before contest
Educational Codeforces Round 169 (Rated for Div. 2)
10:12:50
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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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Status
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Custom test
Problems
#
Name
886C
Petya and Catacombs
dsu
,
greedy
,
implementation
,
trees
1300
x5455
884C
Bertown Subway
dfs and similar
,
greedy
,
math
1500
x4668
883F
Lost in Transliteration
implementation
1300
x2255
883E
Field of Wonders
implementation
,
strings
1500
x1890
878A
Short Program
bitmasks
,
constructive algorithms
1600
x5362
877C
Slava and tanks
constructive algorithms
1600
x5650
877B
Nikita and string
brute force
,
dp
1500
x10279
876B
Divisiblity of Differences
implementation
,
math
,
number theory
1300
x8961
875B
Sorting the Coins
dsu
,
implementation
,
sortings
,
two pointers
1500
x5176
873C
Strange Game On Matrix
greedy
,
two pointers
1600
x3235
873B
Balanced Substring
dp
,
implementation
1500
x7682
870C
Maximum splitting
dp
,
greedy
,
math
,
number theory
1300
x9032
868C
Qualification Rounds
bitmasks
,
brute force
,
constructive algorithms
,
dp
1500
x4592
868B
Race Against Time
implementation
1400
x3664
865A
Save the problem!
constructive algorithms
1400
x4317
864D
Make a Permutation!
greedy
,
implementation
,
math
1500
x5974
864C
Bus
greedy
,
implementation
,
math
1500
x5845
863B
Kayaking
brute force
,
greedy
,
sortings
1500
x8033
862B
Mahmoud and Ehab and the bipartiteness
dfs and similar
,
graphs
,
trees
1300
x16980
859C
Pie Rules
dp
,
games
1500
x5345
858D
Polycarp's phone book
data structures
,
implementation
,
sortings
1600
x3762
858C
Did you mean...
dp
,
greedy
,
implementation
1500
x5607
858B
Which floor?
brute force
,
implementation
1500
x3719
856A
Set Theory
brute force
,
constructive algorithms
1600
x1411
855B
Marvolo Gaunt's Ring
brute force
,
data structures
,
dp
1500
x8519
853A
Planning
greedy
1500
x5826
852G
Bathroom terminal
implementation
1700
x1278
851B
Arpa and an exam about geometry
geometry
,
math
1400
x5474
850A
Five Dimensional Points
brute force
,
geometry
,
math
1700
x3140
849B
Tell Your World
brute force
,
geometry
1600
x3584
848A
From Y to Y
constructive algorithms
1600
x5109
847H
Load Testing
greedy
1600
x2381
847B
Preparing for Merge Sort
binary search
,
data structures
1600
x4813
847A
Union of Doubly Linked Lists
implementation
1500
x3343
846A
Curriculum Vitae
brute force
,
implementation
1500
x4194
845C
Two TVs
data structures
,
greedy
,
sortings
1500
x8347
845B
Luba And The Ticket
brute force
,
greedy
,
implementation
1600
x4983
844B
Rectangles
combinatorics
,
math
1300
x7259
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x5600
840A
Leha and Function
combinatorics
,
greedy
,
math
,
number theory
,
sortings
1300
x6976
839C
Journey
dfs and similar
,
dp
,
graphs
,
probabilities
,
trees
1500
x16506
838A
Binary Blocks
brute force
1400
x916
837C
Two Seals
brute force
,
implementation
1500
x3974
837B
Flag of Berland
brute force
,
implementation
1600
x3917
835C
Star sky
dp
,
implementation
1600
x7807
833A
The Meaningless Game
math
,
number theory
1700
x6141
832B
Petya and Exam
implementation
,
strings
1600
x4368
831C
Jury Marks
brute force
,
constructive algorithms
1700
x4486
830B
Cards Sorting
data structures
,
implementation
,
sortings
1600
x2824
828B
Black Square
implementation
1300
x5677
827A
String Reconstruction
data structures
,
greedy
,
sortings
,
strings
1700
x4006
825D
Suitable Replacement
binary search
,
greedy
,
implementation
1500
x3228
825C
Multi-judge Solving
greedy
,
implementation
1600
x4498
825B
Five-In-a-Row
brute force
,
implementation
1600
x4205
822C
Hacker, pack your bags!
binary search
,
greedy
,
implementation
,
sortings
1600
x4561
821C
Okabe and Boxes
data structures
,
greedy
,
trees
1500
x6754
821B
Okabe and Banana Trees
brute force
,
math
1300
x5728
820B
Mister B and Angle in Polygon
constructive algorithms
,
geometry
,
math
1300
x5177
818D
Multicolored Cars
data structures
,
implementation
1700
x3441
818B
Permutation Game
implementation
1600
x2996
817C
Really Big Numbers
binary search
,
brute force
,
dp
,
math
1600
x7238
817B
Makes And The Product
combinatorics
,
implementation
,
math
,
sortings
1500
x5672
816B
Karen and Coffee
binary search
,
data structures
,
implementation
1400
x17382
815A
Karen and Game
brute force
,
greedy
,
implementation
1700
x5602
814C
An impassioned circulation of affection
brute force
,
dp
,
strings
,
two pointers
1600
x6504
814B
An express train to reveries
constructive algorithms
1300
x5606
813C
The Tag Game
dfs and similar
,
graphs
1700
x5852
812C
Sagheer and Nubian Market
binary search
,
sortings
1500
x13529
812B
Sagheer, the Hausmeister
bitmasks
,
brute force
,
dp
1600
x5147
810B
Summer sell-off
greedy
,
sortings
1300
x11269
809A
Do you want a date?
implementation
,
math
,
sortings
1500
x4683
808C
Tea Party
constructive algorithms
,
greedy
,
sortings
1400
x6086
808B
Average Sleep Time
data structures
,
implementation
,
math
1300
x7262
807B
T-Shirt Hunt
brute force
,
implementation
1300
x3534
804B
Minimum number of steps
combinatorics
,
greedy
,
implementation
,
math
1400
x9593
803A
Maximal Binary Matrix
constructive algorithms
1400
x4786
802J
Send the Fool Further! (easy)
dfs and similar
,
graphs
,
trees
1400
x4470
799B
T-shirt buying
data structures
,
implementation
1400
x8701
798C
Mike and gcd problem
dp
,
greedy
,
number theory
1700
x5763
798B
Mike and strings
brute force
,
dp
,
strings
1300
x8353
797C
Minimal string
data structures
,
greedy
,
strings
1700
x6547
797B
Odd sum
dp
,
greedy
,
implementation
1400
x10424
796B
Find The Bone
implementation
1300
x9023
793B
Igor and his way to work
dfs and similar
,
graphs
,
implementation
,
shortest paths
1600
x4411
792B
Counting-out Rhyme
implementation
1300
x5962
789B
Masha and geometric depression
brute force
,
implementation
,
math
1700
x4368
788A
Functions again
dp
,
two pointers
1600
x9052
787B
Not Afraid
greedy
,
implementation
,
math
1300
x5587
785C
Anton and Fairy Tale
binary search
,
math
1600
x7303
784A
Numbers Joke
*special problem
1700
x3169
780C
Andryusha and Colored Balloons
dfs and similar
,
graphs
,
greedy
,
trees
1600
x9030
780B
The Meeting Place Cannot Be Changed
binary search
1600
x9379
778A
String Game
binary search
,
greedy
,
strings
1700
x11382
777C
Alyona and Spreadsheet
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
1600
x6340
777B
Game of Credit Cards
data structures
,
dp
,
greedy
,
sortings
1300
x9407
774K
Stepan and Vowels
*special problem
,
implementation
,
strings
1600
x1263
774D
Lie or Truth
*special problem
,
constructive algorithms
,
implementation
,
sortings
1500
x1937
773A
Success Rate
binary search
,
math
1700
x4425
771B
Bear and Different Names
constructive algorithms
,
greedy
1500
x6861
771A
Bear and Friendship Condition
dfs and similar
,
dsu
,
graphs
1500
x15059
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