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Before contest
Codeforces Round (Div. 3)
7 days
→ Filter Problems
Difficulty:
—
data structures
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
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x420
776C
Molly's Chemicals
binary search
,
brute force
,
data structures
,
implementation
,
math
1800
x5808
774B
Significant Cups
*special problem
,
binary search
,
data structures
,
two pointers
2100
x217
773E
Blog Post Rating
data structures
,
sortings
3000
x335
768G
The Winds of Winter
binary search
,
data structures
3300
x355
767D
Cartons of milk
binary search
,
data structures
,
greedy
,
sortings
,
two pointers
2100
x2199
767A
Snacktower
data structures
,
implementation
1100
x19432
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x2874
766D
Mahmoud and a Dictionary
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
2000
x3286
765F
Souvenirs
data structures
3100
x1889
763E
Timofey and our friends animals
data structures
,
divide and conquer
,
dsu
2900
x476
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x523
762E
Radio stations
binary search
,
data structures
2200
x1306
761F
Dasha and Photos
brute force
,
data structures
,
dp
,
implementation
2600
x408
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x484
757F
Team Rocket Rises Again
data structures
,
graphs
,
shortest paths
2800
x1108
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2315
756C
Nikita and stack
data structures
2200
x1292
755D
PolandBall and Polygon
data structures
2000
x2475
755B
PolandBall and Game
binary search
,
data structures
,
games
,
greedy
,
sortings
,
strings
1100
x10999
754D
Fedor and coupons
binary search
,
data structures
,
greedy
,
sortings
2100
x2205
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x1471
750D
New Year and Fireworks
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
1900
x3065
749E
Inversions After Shuffle
data structures
,
probabilities
2400
x1035
749D
Leaving Auction
binary search
,
data structures
2000
x2530
748E
Santa Claus and Tangerines
binary search
,
data structures
,
greedy
,
two pointers
2100
x1449
748D
Santa Claus and a Palindrome
constructive algorithms
,
data structures
,
greedy
2100
x1816
746F
Music in Car
data structures
,
greedy
,
two pointers
2200
x724
741E
Arpa’s abnormal DNA and Mehrdad’s deep interest
data structures
,
string suffix structures
3400
x176
741D
Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths
data structures
,
dfs and similar
,
trees
2900
x2481
739E
Gosha is hunting
brute force
,
data structures
,
dp
,
flows
,
math
,
probabilities
,
sortings
3000
x2077
739C
Alyona and towers
data structures
2500
x1444
739B
Alyona and a tree
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
1900
x4457
733F
Drivers Dissatisfaction
data structures
,
dsu
,
graphs
,
trees
2200
x1093
733E
Sleep in Class
constructive algorithms
,
data structures
,
math
,
two pointers
2400
x874
733D
Kostya the Sculptor
data structures
,
hashing
1600
x4142
731F
Video Cards
brute force
,
data structures
,
implementation
,
math
,
number theory
1900
x2768
731D
80-th Level Archeology
brute force
,
data structures
,
greedy
,
sortings
2200
x1157
730L
Expression Queries
data structures
3200
x85
729E
Subordinates
constructive algorithms
,
data structures
,
graphs
,
greedy
,
sortings
1900
x2158
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x1146
725D
Contest Balloons
data structures
,
greedy
1800
x2740
724D
Dense Subsequence
data structures
,
greedy
,
strings
1900
x2261
722F
Cyclic Cipher
chinese remainder theorem
,
data structures
,
implementation
,
number theory
,
two pointers
2800
x474
722D
Generating Sets
binary search
,
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
1900
x3101
722C
Destroying Array
data structures
,
dsu
1600
x8971
721D
Maxim and Array
constructive algorithms
,
data structures
,
greedy
,
math
2000
x2303
720F
Array Covering
data structures
3100
x145
720D
Slalom
data structures
,
dp
,
sortings
3100
x225
718C
Sasha and Array
data structures
,
math
,
matrices
2300
x3421
717F
Heroes of Making Magic III
data structures
2600
x288
713D
Animals and Puzzle
binary search
,
data structures
2700
x1085
713A
Sonya and Queries
data structures
,
implementation
1400
x8352
712E
Memory and Casinos
data structures
,
math
,
probabilities
2500
x605
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1706
708C
Centroids
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2300
x3055
707E
Garlands
data structures
2400
x1009
707D
Persistent Bookcase
bitmasks
,
data structures
,
dfs and similar
,
implementation
2200
x2614
706E
Working routine
data structures
,
implementation
2500
x1119
706D
Vasiliy's Multiset
binary search
,
bitmasks
,
data structures
,
trees
1800
x9513
704E
Iron Man
data structures
,
geometry
,
trees
3300
x279
704A
Thor
brute force
,
data structures
,
implementation
1600
x9011
703D
Mishka and Interesting sum
data structures
2100
x3429
702F
T-Shirts
data structures
2800
x1206
702E
Analysis of Pathes in Functional Graph
data structures
,
graphs
2100
x2331
702B
Powers of Two
brute force
,
data structures
,
implementation
,
math
1500
x11403
701B
Cells Not Under Attack
data structures
,
math
1200
x11596
700D
Huffman Coding on Segment
data structures
,
greedy
3100
x455
696E
...Wait for it...
data structures
,
dsu
,
trees
3000
x492
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x1239
696A
Lorenzo Von Matterhorn
brute force
,
data structures
,
implementation
,
trees
1500
x6002
690B3
Recover Polygon (hard)
data structures
2600
x91
689E
Mike and Geometry Problem
combinatorics
,
data structures
,
dp
,
geometry
,
implementation
2000
x1822
689D
Friends and Subsequences
binary search
,
data structures
2100
x3130
687D
Dividing Kingdom II
brute force
,
data structures
,
dsu
,
graphs
,
sortings
2500
x856
685B
Kay and Snowflake
data structures
,
dfs and similar
,
dp
,
trees
1900
x3815
681C
Heap Operations
constructive algorithms
,
data structures
,
greedy
1600
x7344
679E
Bear and Bad Powers of 42
data structures
3100
x671
678F
Lena and Queries
data structures
,
divide and conquer
,
geometry
2500
x849
677D
Vanya and Treasure
data structures
,
dp
,
graphs
,
shortest paths
2300
x1534
675E
Trains and Statistic
data structures
,
dp
,
greedy
2300
x2630
675D
Tree Construction
data structures
,
trees
1800
x3713
675C
Money Transfers
constructive algorithms
,
data structures
,
greedy
,
sortings
2100
x3484
671E
Organizing a Race
data structures
,
greedy
3300
x397
671D
Roads in Yusland
data structures
,
dp
,
greedy
2900
x1113
671C
Ultimate Weirdness of an Array
data structures
,
number theory
2800
x665
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x3161
666E
Forensic Examination
data structures
,
string suffix structures
3100
x1340
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x579
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x2930
660F
Bear and Bowling 4
binary search
,
data structures
,
divide and conquer
,
geometry
,
ternary search
2500
x1538
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7356
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x966
652D
Nested Segments
data structures
,
sortings
1800
x3845
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x588
650D
Zip-line
binary search
,
data structures
,
dp
,
hashing
2600
x1244
650A
Watchmen
data structures
,
geometry
,
math
1400
x15150
649E
Автобус
binary search
,
data structures
,
greedy
,
sortings
2100
x105
648D
Собачки и миски
data structures
,
greedy
,
sortings
1900
x225
644C
Hostname Aliases
*special problem
,
binary search
,
data structures
,
implementation
,
sortings
,
strings
2100
x910
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