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Before contest
Codeforces Round (Div. 3)
4 days
→ Filter Problems
Difficulty:
—
constructive algorithms
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
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x426
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7622
1774C
Ice and Fire
constructive algorithms
,
dp
,
greedy
1300
x11768
1774B
Coloring
constructive algorithms
,
greedy
,
math
1500
x11865
1774A
Add Plus Minus Sign
constructive algorithms
,
math
800
x22187
1773K
King's Puzzle
constructive algorithms
1900
x1394
1773J
Jumbled Trees
constructive algorithms
,
math
2900
x104
1773F
Football
constructive algorithms
800
x4014
1773A
Amazing Trick
constructive algorithms
,
graph matchings
,
math
,
probabilities
1900
x1500
1772F
Copy of a Copy of a Copy
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
sortings
2000
x2284
1772D
Absolute Sorting
constructive algorithms
,
math
1400
x15349
1772C
Different Differences
constructive algorithms
,
greedy
,
math
1000
x23056
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x13536
1770H
Koxia, Mahiru and Winter Festival
constructive algorithms
3500
x100
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3732
1770B
Koxia and Permutation
constructive algorithms
1000
x19179
1768D
Lucky Permutation
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1800
x6862
1768C
Elemental Decompress
constructive algorithms
,
greedy
,
implementation
,
sortings
1300
x13781
1767D
Playoff
combinatorics
,
constructive algorithms
,
dp
,
greedy
,
math
1500
x9640
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x372
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x4014
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x938
1763C
Another Array Problem
brute force
,
constructive algorithms
,
greedy
2000
x6392
1763A
Absolute Maximization
bitmasks
,
constructive algorithms
,
greedy
,
math
800
x15510
1762G
Unequal Adjacent Elements
constructive algorithms
,
sortings
3100
x101
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x3365
1762B
Make Array Good
constructive algorithms
,
implementation
,
number theory
,
sortings
1100
x16626
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1760
1761C
Set Construction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1400
x9314
1761B
Elimination of a Ring
constructive algorithms
,
greedy
,
implementation
1000
x13179
1761A
Two Permutations
brute force
,
constructive algorithms
800
x18182
1759G
Restore the Permutation
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
1900
x4336
1758F
Decent Division
constructive algorithms
,
data structures
3000
x162
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x7077
1758B
XOR = Average
constructive algorithms
900
x20782
1758A
SSeeeeiinngg DDoouubbllee
constructive algorithms
,
strings
800
x24891
1754B
Kevin and Permutation
constructive algorithms
,
greedy
,
math
800
x18717
1753D
The Beach
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1691
1753A2
Make Nonzero Sum (hard version)
constructive algorithms
,
dp
,
greedy
1500
x10021
1753A1
Make Nonzero Sum (easy version)
constructive algorithms
,
dp
,
greedy
1300
x14568
1750H
BinaryStringForces
constructive algorithms
,
data structures
,
dp
3500
x77
1750C
Complementary XOR
constructive algorithms
,
implementation
1400
x9392
1750A
Indirect Sort
constructive algorithms
,
implementation
,
math
800
x16925
1749E
Cactus Wall
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1647
1748F
Circular Xor Reversal
bitmasks
,
constructive algorithms
3000
x328
1748D
ConstructOR
bitmasks
,
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
math
,
number theory
2100
x2711
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x4563
1747B
BAN BAN
constructive algorithms
900
x22441
1747A
Two Groups
constructive algorithms
,
greedy
800
x24630
1746E1
Joking (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
ternary search
2500
x1390
1746C
Permutation Operations
constructive algorithms
,
greedy
,
implementation
,
math
1300
x12590
1746B
Rebellion
constructive algorithms
,
greedy
,
two pointers
800
x16983
1746A
Maxmina
constructive algorithms
,
greedy
800
x19697
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x249
1743C
Save the Magazines
constructive algorithms
,
dp
,
greedy
1100
x18845
1743B
Permutation Value
constructive algorithms
,
greedy
800
x22049
1742F
Smaller
constructive algorithms
,
greedy
,
strings
1500
x11187
1741B
Funny Permutation
constructive algorithms
,
math
800
x25068
1740G
Dangerous Laser Power
constructive algorithms
,
dsu
,
sortings
3100
x184
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4204
1740D
Knowledge Cards
constructive algorithms
,
data structures
1500
x7871
1740C
Bricks and Bags
constructive algorithms
,
games
,
greedy
,
sortings
1400
x10766
1740A
Factorise N+M
constructive algorithms
,
number theory
800
x19855
1739C
Card Game
combinatorics
,
constructive algorithms
,
dp
,
games
1500
x8866
1739B
Array Recovery
constructive algorithms
,
greedy
,
math
1100
x21850
1738G
Anti-Increasing Addicts
constructive algorithms
,
dp
,
greedy
,
math
2900
x416
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1195
1738D
Permutation Addicts
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
1900
x3382
1738B
Prefix Sum Addicts
constructive algorithms
,
greedy
,
math
,
sortings
1200
x15172
1737F
Ela and Prime GCD
constructive algorithms
,
math
,
number theory
3300
x122
1737C
Ela and Crickets
constructive algorithms
,
games
,
implementation
,
math
1500
x5639
1736D
Equal Binary Subsequences
constructive algorithms
,
geometry
,
greedy
,
implementation
,
strings
2200
x2423
1735E
House Planning
constructive algorithms
,
data structures
,
graph matchings
,
greedy
2400
x1032
1735A
Working Week
constructive algorithms
,
greedy
,
math
800
x20031
1734E
Rectangular Congruence
constructive algorithms
,
number theory
2100
x2827
1734B
Bright, Nice, Brilliant
constructive algorithms
800
x15658
1733E
Conveyor
constructive algorithms
,
dp
,
math
2700
x1113
1733D1
Zero-One (Easy Version)
constructive algorithms
,
greedy
,
math
1400
x13129
1733C
Parity Shuffle Sorting
constructive algorithms
,
sortings
1300
x15312
1733B
Rule of League
constructive algorithms
,
math
900
x19452
1732A
Bestie
brute force
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x14651
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2617
1729C
Jumping on Tiles
constructive algorithms
,
strings
1100
x19644
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x7007
1728B
Best Permutation
constructive algorithms
,
greedy
800
x20007
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3603
1726B
Mainak and Interesting Sequence
bitmasks
,
constructive algorithms
,
math
1100
x14879
1725H
Hot Black Hot White
constructive algorithms
,
math
1800
x2543
1722G
Even-Odd XOR
bitmasks
,
constructive algorithms
,
greedy
1500
x10787
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x372
1720E
Misha and Paintings
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
2700
x751
1719B
Mathematical Circus
constructive algorithms
,
math
800
x18378
1718E
Impressionism
constructive algorithms
,
graphs
,
implementation
,
math
3500
x105
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x521
1717D
Madoka and The Corruption Scheme
combinatorics
,
constructive algorithms
,
greedy
,
math
1900
x4317
1717B
Madoka and Underground Competitions
constructive algorithms
,
implementation
1100
x14580
1716B
Permutation Chain
constructive algorithms
,
math
800
x21295
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x510
1715B
Beautiful Array
constructive algorithms
,
greedy
,
math
1000
x20795
1715A
Crossmarket
constructive algorithms
,
greedy
,
math
800
x23322
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