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Before contest
Codeforces Round 941 (Div. 1)
2 days
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Before contest
Codeforces Round 941 (Div. 2)
2 days
Register now »
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data structures
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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
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number theory
probabilities
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shortest paths
sortings
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ternary search
trees
two pointers
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Problems
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Name
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4331
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4352
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4392
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x4445
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4452
1536D
Omkar and Medians
data structures
,
greedy
,
implementation
2000
x4551
1296E2
String Coloring (hard version)
data structures
,
dp
2000
x4721
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x4811
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x4847
938D
Buy a Ticket
data structures
,
graphs
,
shortest paths
2000
x5016
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5397
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5669
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x6073
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6115
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6191
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6444
242E
XOR on Segment
bitmasks
,
data structures
2000
x8368
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x8922
380C
Sereja and Brackets
data structures
,
schedules
2000
x13516
648D
Собачки и миски
data structures
,
greedy
,
sortings
1900
x221
421D
Bug in Code
binary search
,
data structures
,
sortings
1900
x492
331B2
Shave Beaver!
data structures
1900
x672
45C
Dancing Lessons
data structures
1900
x847
926E
Merge Equal Elements
constructive algorithms
,
data structures
1900
x908
46E
Comb
data structures
,
dp
1900
x916
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1192
67D
Optical Experiment
binary search
,
data structures
,
dp
1900
x1329
37C
Old Berland Language
data structures
,
greedy
,
trees
1900
x1490
819B
Mister B and PR Shifts
data structures
,
implementation
,
math
1900
x1620
362C
Insertion Sort
data structures
,
dp
,
implementation
,
math
1900
x1645
223B
Two Strings
data structures
,
dp
,
strings
1900
x1717
848B
Rooter's Song
constructive algorithms
,
data structures
,
geometry
,
implementation
,
sortings
,
two pointers
1900
x1813
1912A
Accumulator Apex
data structures
,
implementation
,
sortings
1900
x1837
818E
Card Game Again
binary search
,
data structures
,
number theory
,
two pointers
1900
x1871
377B
Preparing for the Contest
binary search
,
data structures
,
greedy
,
sortings
1900
x1971
930C
Teodor is not a liar!
data structures
,
dp
1900
x2068
729E
Subordinates
constructive algorithms
,
data structures
,
graphs
,
greedy
,
sortings
1900
x2132
982D
Shark
brute force
,
data structures
,
dsu
,
trees
1900
x2242
724D
Dense Subsequence
data structures
,
greedy
,
strings
1900
x2249
292D
Connected Components
data structures
,
dfs and similar
,
dp
,
dsu
1900
x2303
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2306
846D
Monitor
binary search
,
data structures
1900
x2340
534D
Handshakes
binary search
,
constructive algorithms
,
data structures
,
greedy
1900
x2367
367B
Sereja ans Anagrams
binary search
,
data structures
1900
x2402
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2598
731F
Video Cards
brute force
,
data structures
,
implementation
,
math
,
number theory
1900
x2749
1648C
Tyler and Strings
combinatorics
,
data structures
,
implementation
1900
x2857
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2884
893D
Credit Card
data structures
,
dp
,
greedy
,
implementation
1900
x2913
1644E
Expand the Path
brute force
,
combinatorics
,
data structures
,
implementation
,
math
1900
x2957
1277D
Let's Play the Words?
data structures
,
hashing
,
implementation
,
math
1900
x2960
796C
Bank Hacking
constructive algorithms
,
data structures
,
dp
,
trees
1900
x2964
6E
Exposition
binary search
,
data structures
,
dsu
,
trees
,
two pointers
1900
x2982
750D
New Year and Fireworks
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
1900
x3054
1477B
Nezzar and Binary String
data structures
,
greedy
1900
x3058
722D
Generating Sets
binary search
,
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
1900
x3073
566D
Restructuring Company
data structures
,
dsu
1900
x3087
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3193
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x3298
1738D
Permutation Addicts
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
1900
x3312
1017D
The Wu
bitmasks
,
brute force
,
data structures
1900
x3329
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3403
961E
Tufurama
data structures
1900
x3434
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x3455
1041E
Tree Reconstruction
constructive algorithms
,
data structures
,
graphs
,
greedy
1900
x3498
1163C2
Power Transmission (Hard Edition)
data structures
,
geometry
,
implementation
,
math
1900
x3513
111B
Petya and Divisors
binary search
,
data structures
,
number theory
1900
x3534
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3588
1076E
Vasya and a Tree
data structures
,
trees
1900
x3605
1585D
Yet Another Sorting Problem
data structures
,
math
1900
x3619
1902D
Robot Queries
binary search
,
data structures
,
dp
,
implementation
1900
x3628
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3681
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3684
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3690
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x3707
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x3724
685B
Kay and Snowflake
data structures
,
dfs and similar
,
dp
,
trees
1900
x3762
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3770
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3859
292E
Copying Data
data structures
1900
x3894
1200D
White Lines
brute force
,
data structures
,
dp
,
implementation
,
two pointers
1900
x3909
1311F
Moving Points
data structures
,
divide and conquer
,
implementation
,
sortings
1900
x3926
557C
Arthur and Table
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
1900
x3937
1650E
Rescheduling the Exam
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1900
x4001
319B
Psychos in a Line
data structures
,
implementation
1900
x4009
1689D
Lena and Matrix
data structures
,
dp
,
geometry
,
shortest paths
1900
x4018
1141F2
Same Sum Blocks (Hard)
data structures
,
greedy
1900
x4048
999D
Equalize the Remainders
data structures
,
greedy
,
implementation
1900
x4136
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4200
1759G
Restore the Permutation
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
1900
x4200
1569D
Inconvenient Pairs
binary search
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x4239
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4328
552D
Vanya and Triangles
brute force
,
combinatorics
,
data structures
,
geometry
,
math
,
sortings
1900
x4351
817D
Imbalanced Array
data structures
,
divide and conquer
,
dsu
,
sortings
1900
x4382
739B
Alyona and a tree
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
1900
x4417
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x4462
1661D
Progressions Covering
data structures
,
greedy
1900
x4502
597C
Subsequences
data structures
,
dp
1900
x4504
1208D
Restore Permutation
binary search
,
data structures
,
greedy
,
implementation
1900
x4649
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4758
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