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Before contest
Codeforces Round 941 (Div. 1)
28:18:55
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Before contest
Codeforces Round 941 (Div. 2)
28:18:55
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two pointers
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
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x995
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x1065
498B
Name That Tune
dp
,
probabilities
,
two pointers
2400
x1147
1443E
Long Permutation
brute force
,
math
,
two pointers
2400
x1223
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1229
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1320
220E
Little Elephant and Inversions
data structures
,
two pointers
2400
x1327
1367F2
Flying Sort (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2400
x1440
912E
Prime Gift
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
,
two pointers
2400
x1470
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1542
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1559
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1649
1582F2
Korney Korneevich and XOR (hard version)
binary search
,
brute force
,
dp
,
greedy
,
two pointers
2400
x1709
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1719
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1849
1326E
Bombs
data structures
,
two pointers
2400
x1953
1436E
Complicated Computations
binary search
,
data structures
,
two pointers
2400
x2108
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2160
203E
Transportation
greedy
,
sortings
,
two pointers
2300
x276
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x301
43E
Race
brute force
,
implementation
,
two pointers
2300
x370
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x667
594C
Edo and Magnets
brute force
,
greedy
,
implementation
,
two pointers
2300
x673
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x673
1250G
Discarding Game
dp
,
greedy
,
two pointers
2300
x707
1379D
New Passenger Trams
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
2300
x1057
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1123
901C
Bipartite Segments
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2300
x1131
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1179
830C
Bamboo Partition
brute force
,
data structures
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2300
x1181
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1261
610D
Vika and Segments
constructive algorithms
,
data structures
,
geometry
,
two pointers
2300
x1433
1738E
Balance Addicts
combinatorics
,
dp
,
math
,
two pointers
2300
x1448
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1449
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1491
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1519
1698E
PermutationForces II
brute force
,
combinatorics
,
greedy
,
sortings
,
trees
,
two pointers
2300
x1567
1148E
Earth Wind and Fire
constructive algorithms
,
greedy
,
math
,
sortings
,
two pointers
2300
x1654
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1659
1550D
Excellent Arrays
binary search
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
sortings
,
two pointers
2300
x1779
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2036
1404C
Fixed Point Removal
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2300
x2484
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x4207
70C
Lucky Tickets
binary search
,
data structures
,
sortings
,
two pointers
2200
x561
746F
Music in Car
data structures
,
greedy
,
two pointers
2200
x722
1607H
Banquet Preparations 2
greedy
,
sortings
,
two pointers
2200
x1187
1252E
Songwriter
greedy
,
two pointers
2200
x1208
1772G
Gaining Rating
binary search
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
2200
x1260
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1608
620D
Professor GukiZ and Two Arrays
binary search
,
two pointers
2200
x1627
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1744
1181D
Irrigation
binary search
,
data structures
,
implementation
,
sortings
,
trees
,
two pointers
2200
x2017
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2027
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2206
1627E
Not Escaping
data structures
,
dp
,
implementation
,
shortest paths
,
two pointers
2200
x2219
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2586
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2680
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x2740
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2823
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3195
1333F
Kate and imperfection
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2200
x3906
833B
The Bakery
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2200
x4477
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4965
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x12473
774B
Significant Cups
*special problem
,
binary search
,
data structures
,
two pointers
2100
x216
76B
Mice
greedy
,
two pointers
2100
x494
309B
Context Advertising
dp
,
two pointers
2100
x498
163C
Conveyor
sortings
,
two pointers
2100
x536
524D
Social Network
greedy
,
two pointers
2100
x939
748E
Santa Claus and Tangerines
binary search
,
data structures
,
greedy
,
two pointers
2100
x1440
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x1953
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2050
229D
Towers
dp
,
greedy
,
two pointers
2100
x2098
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2148
767D
Cartons of milk
binary search
,
data structures
,
greedy
,
sortings
,
two pointers
2100
x2190
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2351
1167E
Range Deleting
binary search
,
combinatorics
,
data structures
,
two pointers
2100
x2391
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2451
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2600
1195E
OpenStreetMap
data structures
,
two pointers
2100
x2797
1254B2
Send Boxes to Alice (Hard Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
2100
x2928
1367F1
Flying Sort (Easy Version)
dp
,
greedy
,
two pointers
2100
x2980
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3029
985E
Pencils and Boxes
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2100
x3236
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3792
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3853
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x3951
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4079
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4731
484B
Maximum Value
binary search
,
math
,
sortings
,
two pointers
2100
x6768
164B
Ancient Berland Hieroglyphs
two pointers
2000
x450
309A
Morning run
binary search
,
math
,
two pointers
2000
x458
131F
Present to Mom
binary search
,
two pointers
2000
x598
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x710
253D
Table with Letters - 2
brute force
,
two pointers
2000
x805
371E
Subway Innovation
greedy
,
math
,
two pointers
2000
x1203
366D
Dima and Trap Graph
binary search
,
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
two pointers
2000
x1270
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1533
954G
Castle Defense
binary search
,
data structures
,
greedy
,
two pointers
2000
x1893
1190D
Tokitsukaze and Strange Rectangle
data structures
,
divide and conquer
,
sortings
,
two pointers
2000
x2208
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