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Educational Codeforces Round 169 (Rated for Div. 2)
10:19:07
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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
770D
Draw Brackets!
*special problem
,
implementation
1400
x1569
770C
Online Courses In BSU
*special problem
,
dfs and similar
,
graphs
,
implementation
1500
x2603
770B
Maximize Sum of Digits
*special problem
,
implementation
,
math
1300
x2782
769D
k-Interesting Pairs Of Integers
*special problem
,
bitmasks
,
brute force
,
meet-in-the-middle
1700
x2271
769C
Cycle In Maze
*special problem
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1700
x2213
768B
Code For 1
constructive algorithms
,
dfs and similar
,
divide and conquer
1600
x5906
766C
Mahmoud and a Message
brute force
,
dp
,
greedy
,
strings
1700
x4366
765D
Artsem and Saunders
constructive algorithms
,
dsu
,
math
1700
x2460
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x10406
762B
USB vs. PS/2
greedy
,
implementation
,
sortings
,
two pointers
1400
x7917
762A
k-th divisor
math
,
number theory
1400
x19143
761D
Dasha and Very Difficult Problem
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
1700
x3953
761C
Dasha and Password
brute force
,
dp
,
implementation
1500
x5858
761B
Dasha and friends
brute force
,
implementation
,
math
1300
x6834
760B
Frodo and pillows
binary search
,
greedy
1500
x6443
758C
Unfair Poll
binary search
,
constructive algorithms
,
implementation
,
math
1700
x3855
757B
Bash's Big Day
greedy
,
math
,
number theory
1400
x10111
756B
Travel Card
binary search
,
dp
1600
x3431
756A
Pavel and barbecue
constructive algorithms
,
dfs and similar
1700
x3008
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x12098
753B
Interactive Bulls and Cows (Easy)
brute force
,
constructive algorithms
,
implementation
1600
x1186
750C
New Year and Rating
binary search
,
greedy
,
math
1600
x6536
750B
New Year and North Pole
geometry
,
implementation
1300
x9454
749C
Voting
greedy
,
implementation
,
two pointers
1500
x5947
748C
Santa Claus and Robot
constructive algorithms
,
math
1400
x4578
748B
Santa Claus and Keyboard Check
implementation
,
strings
1500
x5309
747E
Comments
dfs and similar
,
expression parsing
,
implementation
,
strings
1700
x1950
747C
Servers
implementation
1300
x4571
746D
Green and Black Tea
constructive algorithms
,
greedy
,
math
1500
x5065
746C
Tram
constructive algorithms
,
implementation
,
math
1600
x3701
745B
Hongcow Solves A Puzzle
implementation
1400
x3733
744A
Hongcow Builds A Nation
dfs and similar
,
graphs
1500
x8201
743C
Vladik and fractions
brute force
,
constructive algorithms
,
math
,
number theory
1500
x12150
742B
Arpa’s obvious problem and Mehrdad’s terrible solution
brute force
,
math
,
number theory
1500
x9175
741B
Arpa's weak amphitheater and Mehrdad's valuable Hoses
dfs and similar
,
dp
,
dsu
1600
x5196
741A
Arpa's loud Owf and Mehrdad's evil plan
dfs and similar
,
math
1600
x5416
740A
Alyona and copybooks
brute force
,
implementation
1300
x8878
739A
Alyona and mex
constructive algorithms
,
greedy
1700
x7780
735D
Taxes
math
,
number theory
1600
x13200
735C
Tennis Championship
combinatorics
,
constructive algorithms
,
greedy
,
math
1600
x7418
734D
Anton and Chess
implementation
1700
x3715
734C
Anton and Making Potions
binary search
,
dp
,
greedy
,
two pointers
1600
x5315
733D
Kostya the Sculptor
data structures
,
hashing
1600
x4157
732D
Exams
binary search
,
greedy
,
sortings
1700
x5468
731C
Socks
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x6878
730H
Delete Them
constructive algorithms
,
implementation
1300
x2952
730G
Car Repair Shop
implementation
1600
x2122
729D
Sea Battle
constructive algorithms
,
greedy
,
math
1700
x3691
729C
Road to Cinema
binary search
,
greedy
,
sortings
1700
x3893
727C
Guess the Array
constructive algorithms
,
interactive
,
math
1400
x7210
727B
Bill Total Value
expression parsing
,
implementation
,
strings
1600
x1983
725C
Hidden Word
brute force
,
constructive algorithms
,
implementation
,
strings
1600
x2618
724B
Batch Sort
brute force
,
greedy
,
implementation
,
math
1500
x4003
723D
Lakes in Berland
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1600
x6912
723C
Polycarp at the Radio
greedy
1600
x4591
722C
Destroying Array
data structures
,
dsu
1600
x9177
722A
Broken Clock
brute force
,
implementation
1300
x6622
719B
Anatoly and Cockroaches
greedy
1400
x8436
718A
Efim and Strange Grade
dp
,
implementation
,
math
1700
x4386
716B
Complete the Word
greedy
,
two pointers
1300
x12002
715A
Plus and Square Root
constructive algorithms
,
math
1600
x5584
713A
Sonya and Queries
data structures
,
implementation
1400
x8426
712C
Memory and De-Evolution
greedy
,
math
1600
x5750
711C
Coloring Trees
dp
1700
x7995
711B
Chris and Magic Square
constructive algorithms
,
implementation
1400
x8403
710C
Magic Odd Square
constructive algorithms
,
math
1500
x5059
710B
Optimal Point on a Line
brute force
,
sortings
1400
x8691
709B
Checkpoints
greedy
,
implementation
,
sortings
1500
x4722
707C
Pythagorean Triples
math
,
number theory
1500
x12507
707B
Bakery
graphs
1300
x12878
706C
Hard problem
dp
,
strings
1600
x15967
704A
Thor
brute force
,
data structures
,
implementation
1600
x9109
703B
Mishka and trip
implementation
,
math
1400
x5657
702C
Cellular Network
binary search
,
implementation
,
two pointers
1500
x14275
702B
Powers of Two
brute force
,
data structures
,
implementation
,
math
1500
x11591
701C
They Are Everywhere
binary search
,
strings
,
two pointers
1500
x14490
699B
One Bomb
implementation
1400
x7565
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x5680
698A
Vacations
dp
1400
x29648
697B
Barnicle
brute force
,
implementation
,
math
,
strings
1400
x5691
696B
Puzzles
dfs and similar
,
math
,
probabilities
,
trees
1700
x3456
696A
Lorenzo Von Matterhorn
brute force
,
data structures
,
implementation
,
trees
1500
x6027
691D
Swaps in Permutation
dfs and similar
,
dsu
,
math
1700
x5452
691B
s-palindrome
implementation
,
strings
1600
x4782
690F1
Tree of Life (easy)
1300
x2134
690C2
Brain Network (medium)
dfs and similar
,
graphs
,
trees
1500
x3661
690C1
Brain Network (easy)
1300
x2728
690B1
Recover Polygon (easy)
1700
x937
689C
Mike and Chocolate Thieves
binary search
,
combinatorics
,
math
1700
x5149
689B
Mike and Shortcuts
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x5667
689A
Mike and Cellphone
brute force
,
constructive algorithms
,
implementation
1400
x5233
687A
NP-Hard Problem
dfs and similar
,
graphs
1500
x14085
685A
Robbers' watch
brute force
,
combinatorics
,
dp
,
math
1700
x4180
683D
Chocolate Bar
*special problem
,
math
1400
x322
683C
Symmetric Difference
*special problem
1600
x315
683B
The Teacher of Physical Education
*special problem
1600
x317
682C
Alyona and the Tree
dfs and similar
,
dp
,
graphs
,
trees
1600
x7107
681C
Heap Operations
constructive algorithms
,
data structures
,
greedy
1600
x7494
681B
Economy Game
brute force
1300
x8844
679A
Bear and Prime 100
constructive algorithms
,
interactive
,
math
1400
x12710
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