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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
Register now »
*has extra registration
→ Filter Problems
Difficulty:
—
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
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x2852
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x2725
609D
Gadgets for dollars and pounds
binary search
,
greedy
,
two pointers
2000
x2540
1157F
Maximum Balanced Circle
constructive algorithms
,
dp
,
greedy
,
two pointers
2000
x2446
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2338
1190D
Tokitsukaze and Strange Rectangle
data structures
,
divide and conquer
,
sortings
,
two pointers
2000
x2207
954G
Castle Defense
binary search
,
data structures
,
greedy
,
two pointers
2000
x1889
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1529
366D
Dima and Trap Graph
binary search
,
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
two pointers
2000
x1269
371E
Subway Innovation
greedy
,
math
,
two pointers
2000
x1202
253D
Table with Letters - 2
brute force
,
two pointers
2000
x804
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x709
131F
Present to Mom
binary search
,
two pointers
2000
x597
309A
Morning run
binary search
,
math
,
two pointers
2000
x457
164B
Ancient Berland Hieroglyphs
two pointers
2000
x449
484B
Maximum Value
binary search
,
math
,
sortings
,
two pointers
2100
x6749
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4724
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4072
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x3948
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3850
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3785
985E
Pencils and Boxes
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2100
x3221
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3028
1367F1
Flying Sort (Easy Version)
dp
,
greedy
,
two pointers
2100
x2977
1254B2
Send Boxes to Alice (Hard Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
2100
x2925
1195E
OpenStreetMap
data structures
,
two pointers
2100
x2796
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2589
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2441
1167E
Range Deleting
binary search
,
combinatorics
,
data structures
,
two pointers
2100
x2385
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2350
767D
Cartons of milk
binary search
,
data structures
,
greedy
,
sortings
,
two pointers
2100
x2184
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2126
229D
Towers
dp
,
greedy
,
two pointers
2100
x2082
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2042
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x1930
748E
Santa Claus and Tangerines
binary search
,
data structures
,
greedy
,
two pointers
2100
x1439
524D
Social Network
greedy
,
two pointers
2100
x937
163C
Conveyor
sortings
,
two pointers
2100
x535
309B
Context Advertising
dp
,
two pointers
2100
x497
76B
Mice
greedy
,
two pointers
2100
x494
774B
Significant Cups
*special problem
,
binary search
,
data structures
,
two pointers
2100
x216
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x12431
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4955
833B
The Bakery
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2200
x4457
1333F
Kate and imperfection
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2200
x3904
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3189
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2816
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x2736
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2663
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2583
1627E
Not Escaping
data structures
,
dp
,
implementation
,
shortest paths
,
two pointers
2200
x2213
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2201
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2017
1181D
Irrigation
binary search
,
data structures
,
implementation
,
sortings
,
trees
,
two pointers
2200
x2013
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1738
620D
Professor GukiZ and Two Arrays
binary search
,
two pointers
2200
x1622
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1593
1772G
Gaining Rating
binary search
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
2200
x1259
1252E
Songwriter
greedy
,
two pointers
2200
x1208
1607H
Banquet Preparations 2
greedy
,
sortings
,
two pointers
2200
x1184
746F
Music in Car
data structures
,
greedy
,
two pointers
2200
x720
70C
Lucky Tickets
binary search
,
data structures
,
sortings
,
two pointers
2200
x560
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x4198
1404C
Fixed Point Removal
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2300
x2482
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2030
1550D
Excellent Arrays
binary search
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
sortings
,
two pointers
2300
x1778
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
x1650
1698E
PermutationForces II
brute force
,
combinatorics
,
greedy
,
sortings
,
trees
,
two pointers
2300
x1564
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1512
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1485
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
x1440
610D
Vika and Segments
constructive algorithms
,
data structures
,
geometry
,
two pointers
2300
x1427
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1258
830C
Bamboo Partition
brute force
,
data structures
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2300
x1180
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1174
901C
Bipartite Segments
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2300
x1129
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1119
1379D
New Passenger Trams
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
2300
x1055
1250G
Discarding Game
dp
,
greedy
,
two pointers
2300
x707
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x673
594C
Edo and Magnets
brute force
,
greedy
,
implementation
,
two pointers
2300
x671
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x665
43E
Race
brute force
,
implementation
,
two pointers
2300
x368
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x299
203E
Transportation
greedy
,
sortings
,
two pointers
2300
x275
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2158
1436E
Complicated Computations
binary search
,
data structures
,
two pointers
2400
x2105
1326E
Bombs
data structures
,
two pointers
2400
x1951
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1845
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1715
1582F2
Korney Korneevich and XOR (hard version)
binary search
,
brute force
,
dp
,
greedy
,
two pointers
2400
x1706
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1646
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1551
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1541
912E
Prime Gift
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
,
two pointers
2400
x1468
1367F2
Flying Sort (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2400
x1436
220E
Little Elephant and Inversions
data structures
,
two pointers
2400
x1323
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1310
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