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Codeforces Round (Div. 2)
7 days
→ Filter Problems
Difficulty:
—
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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Status
Standings
Custom test
Problems
#
Name
1762B
Make Array Good
constructive algorithms
,
implementation
,
number theory
,
sortings
1100
x16954
1762A
Divide and Conquer
greedy
,
math
,
number theory
800
x19059
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x111
1761F2
Anti-median (Hard Version)
combinatorics
,
dp
,
math
3500
x81
1761F1
Anti-median (Easy Version)
dp
,
math
3100
x206
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1834
1761D
Carry Bit
combinatorics
,
math
2100
x2448
1761C
Set Construction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1400
x9586
1761B
Elimination of a Ring
constructive algorithms
,
greedy
,
implementation
1000
x13446
1761A
Two Permutations
brute force
,
constructive algorithms
800
x19684
1760G
SlavicG's Favorite Problem
bitmasks
,
dfs and similar
,
graphs
1700
x7352
1760F
Quests
binary search
,
greedy
,
sortings
1500
x12225
1760E
Binary Inversions
data structures
,
greedy
,
math
1100
x20303
1760D
Challenging Valleys
implementation
,
two pointers
1000
x23665
1760C
Advantage
data structures
,
implementation
,
sortings
800
x37049
1760B
Atilla's Favorite Problem
greedy
,
implementation
,
strings
800
x44497
1760A
Medium Number
implementation
,
sortings
800
x59153
1759G
Restore the Permutation
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
1900
x4481
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x3917
1759E
The Humanoid
brute force
,
dp
,
sortings
1500
x10808
1759D
Make It Round
brute force
,
number theory
1400
x13607
1759C
Thermostat
greedy
,
math
,
shortest paths
1100
x17634
1759B
Lost Permutation
math
800
x22223
1759A
Yes-Yes?
implementation
,
strings
800
x29984
1758F
Decent Division
constructive algorithms
,
data structures
3000
x171
1758E
Tick, Tock
combinatorics
,
dfs and similar
,
dsu
,
graphs
2500
x842
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x7309
1758C
Almost All Multiples
greedy
,
number theory
1400
x13628
1758B
XOR = Average
constructive algorithms
900
x21260
1758A
SSeeeeiinngg DDoouubbllee
constructive algorithms
,
strings
800
x25185
1754B
Kevin and Permutation
constructive algorithms
,
greedy
,
math
800
x18890
1754A
Technical Support
greedy
800
x23199
1753F
Minecraft Series
brute force
,
two pointers
3500
x208
1753E
N Machines
binary search
,
brute force
,
greedy
3300
x332
1753D
The Beach
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1755
1753C
Wish I Knew How to Sort
dp
,
math
,
probabilities
2000
x4460
1753B
Factorial Divisibility
math
,
number theory
1600
x12766
1753A2
Make Nonzero Sum (hard version)
constructive algorithms
,
dp
,
greedy
1500
x10326
1753A1
Make Nonzero Sum (easy version)
constructive algorithms
,
dp
,
greedy
1300
x14913
1750H
BinaryStringForces
constructive algorithms
,
data structures
,
dp
3500
x82
1750G
Doping
combinatorics
,
dp
,
math
3300
x248
1750F
Majority
combinatorics
,
dp
,
math
,
strings
2700
x913
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1417
1750D
Count GCD
combinatorics
,
math
,
number theory
1800
x5877
1750C
Complementary XOR
constructive algorithms
,
implementation
1400
x9554
1750B
Maximum Substring
brute force
,
greedy
,
implementation
800
x16233
1750A
Indirect Sort
constructive algorithms
,
implementation
,
math
800
x17059
1749F
Distance to the Path
data structures
,
dfs and similar
,
trees
2800
x511
1749E
Cactus Wall
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1711
1749D
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
1900
x5581
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x13929
1749B
Death's Blessing
greedy
900
x20993
1749A
Cowardly Rooks
greedy
,
implementation
800
x22336
1748F
Circular Xor Reversal
bitmasks
,
constructive algorithms
3000
x335
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1914
1748D
ConstructOR
bitmasks
,
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
math
,
number theory
2100
x2817
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x11101
1748B
Diverse Substrings
brute force
,
implementation
,
strings
1400
x15028
1748A
The Ultimate Square
math
800
x24066
1747E
List Generation
combinatorics
,
dp
,
math
2900
x513
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x4665
1747C
Swap Game
games
1200
x21220
1747B
BAN BAN
constructive algorithms
900
x22967
1747A
Two Groups
constructive algorithms
,
greedy
800
x24862
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x96
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x1730
1746E2
Joking (Hard Version)
dp
,
interactive
3200
x395
1746E1
Joking (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
ternary search
2500
x1435
1746D
Paths on the Tree
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1900
x4614
1746C
Permutation Operations
constructive algorithms
,
greedy
,
implementation
,
math
1300
x12802
1746B
Rebellion
constructive algorithms
,
greedy
,
two pointers
800
x17159
1746A
Maxmina
constructive algorithms
,
greedy
800
x19816
1744F
MEX vs MED
math
,
two pointers
2000
x3088
1744E2
Divisible Numbers (hard version)
brute force
,
math
,
number theory
1900
x5596
1744E1
Divisible Numbers (easy version)
brute force
,
math
,
number theory
1500
x10872
1744D
Divisibility by 2^n
greedy
,
math
,
sortings
1200
x21420
1744C
Traffic Light
binary search
,
implementation
,
two pointers
1000
x27245
1744B
Even-Odd Increments
implementation
,
math
800
x23490
1744A
Number Replacement
greedy
,
implementation
800
x27139
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x256
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1502
1743E
FTL
binary search
,
dp
2400
x1580
1743D
Problem with Random Tests
brute force
,
dp
,
greedy
,
probabilities
1700
x7594
1743C
Save the Magazines
constructive algorithms
,
dp
,
greedy
1100
x19165
1743B
Permutation Value
constructive algorithms
,
greedy
800
x22205
1743A
Password
brute force
,
combinatorics
,
implementation
,
math
800
x26732
1742G
Orray
bitmasks
,
brute force
,
greedy
,
math
,
sortings
1500
x10744
1742F
Smaller
constructive algorithms
,
greedy
,
strings
1500
x11667
1742E
Scuza
binary search
,
greedy
,
math
1200
x24704
1742D
Coprime
brute force
,
greedy
,
number theory
1100
x23664
1742C
Stripes
implementation
900
x32965
1742B
Increasing
greedy
,
implementation
,
sortings
800
x47698
1742A
Sum
implementation
800
x72204
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1498
1741F
Multi-Colored Segments
binary search
,
data structures
,
math
,
sortings
2000
x2398
1741E
Sending a Sequence Over the Network
dp
1600
x12259
1741D
Masha and a Beautiful Tree
dfs and similar
,
divide and conquer
,
graphs
,
sortings
,
trees
1300
x15220
1741C
Minimize the Thickness
brute force
,
greedy
,
math
,
two pointers
1100
x17749
1741B
Funny Permutation
constructive algorithms
,
math
800
x25395
1741A
Compare T-Shirt Sizes
implementation
,
implementation
,
strings
800
x30803
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