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Before contest
Codeforces Round 950 (Div. 3)
46:38:02
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Difficulty:
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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
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x669
1764H
Doremy's Paint 2
data structures
3400
x169
1764G3
Doremy's Perfect DS Class (Hard Version)
binary search
,
interactive
3300
x437
1764G2
Doremy's Perfect DS Class (Medium Version)
binary search
,
interactive
3000
x502
1764G1
Doremy's Perfect DS Class (Easy Version)
binary search
,
interactive
2900
x554
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x927
1764E
Doremy's Number Line
dp
,
greedy
,
sortings
2400
x1187
1764D
Doremy's Pegging Game
combinatorics
,
dp
,
math
2000
x2656
1764C
Doremy's City Construction
graphs
,
greedy
1400
x9091
1764B
Doremy's Perfect Math Class
math
,
number theory
900
x15333
1764A
Doremy's Paint
greedy
800
x16213
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x421
1763E
Node Pairs
dp
,
graphs
,
math
,
number theory
2200
x1709
1763D
Valid Bitonic Permutations
combinatorics
,
dp
,
implementation
,
math
,
number theory
2200
x1970
1763C
Another Array Problem
brute force
,
constructive algorithms
,
greedy
2000
x6331
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x14037
1763A
Absolute Maximization
bitmasks
,
constructive algorithms
,
greedy
,
math
800
x15359
1762G
Unequal Adjacent Elements
constructive algorithms
,
sortings
3100
x101
1762F
Good Pairs
binary search
,
data structures
,
dp
2600
x568
1762E
Tree Sum
combinatorics
,
math
,
trees
2600
x610
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x3315
1762C
Binary Strings are Fun
combinatorics
,
math
1400
x8903
1762B
Make Array Good
constructive algorithms
,
implementation
,
number theory
,
sortings
1100
x16308
1762A
Divide and Conquer
greedy
,
math
,
number theory
800
x18630
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x100
1761F2
Anti-median (Hard Version)
combinatorics
,
dp
,
math
3500
x78
1761F1
Anti-median (Easy Version)
dp
,
math
3100
x203
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1744
1761D
Carry Bit
combinatorics
,
math
2100
x2353
1761C
Set Construction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1400
x9213
1761B
Elimination of a Ring
constructive algorithms
,
greedy
,
implementation
1000
x13059
1761A
Two Permutations
brute force
,
constructive algorithms
800
x17424
1760G
SlavicG's Favorite Problem
bitmasks
,
dfs and similar
,
graphs
1700
x6975
1760F
Quests
binary search
,
greedy
,
sortings
1500
x11448
1760E
Binary Inversions
data structures
,
greedy
,
math
1100
x19430
1760D
Challenging Valleys
implementation
,
two pointers
1000
x22578
1760C
Advantage
data structures
,
implementation
,
sortings
800
x35365
1760B
Atilla's Favorite Problem
greedy
,
implementation
,
strings
800
x42171
1760A
Medium Number
implementation
,
sortings
800
x54612
1759G
Restore the Permutation
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
1900
x4271
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x3738
1759E
The Humanoid
brute force
,
dp
,
sortings
1500
x10091
1759D
Make It Round
brute force
,
number theory
1400
x12440
1759C
Thermostat
greedy
,
math
,
shortest paths
1100
x17100
1759B
Lost Permutation
math
800
x21713
1759A
Yes-Yes?
implementation
,
strings
800
x28961
1758F
Decent Division
constructive algorithms
,
data structures
3000
x159
1758E
Tick, Tock
combinatorics
,
dfs and similar
,
dsu
,
graphs
2500
x796
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x6939
1758C
Almost All Multiples
greedy
,
number theory
1400
x13041
1758B
XOR = Average
constructive algorithms
900
x20344
1758A
SSeeeeiinngg DDoouubbllee
constructive algorithms
,
strings
800
x24525
1754B
Kevin and Permutation
constructive algorithms
,
greedy
,
math
800
x18585
1754A
Technical Support
greedy
800
x22720
1753F
Minecraft Series
brute force
,
two pointers
3500
x194
1753E
N Machines
binary search
,
brute force
,
greedy
3300
x310
1753D
The Beach
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1683
1753C
Wish I Knew How to Sort
dp
,
math
,
probabilities
2000
x4204
1753B
Factorial Divisibility
math
,
number theory
1600
x12163
1753A2
Make Nonzero Sum (hard version)
constructive algorithms
,
dp
,
greedy
1500
x9865
1753A1
Make Nonzero Sum (easy version)
constructive algorithms
,
dp
,
greedy
1300
x14403
1750H
BinaryStringForces
constructive algorithms
,
data structures
,
dp
3500
x74
1750G
Doping
combinatorics
,
dp
,
math
3300
x226
1750F
Majority
combinatorics
,
dp
,
math
,
strings
2700
x865
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1369
1750D
Count GCD
combinatorics
,
math
,
number theory
1800
x5623
1750C
Complementary XOR
constructive algorithms
,
implementation
1400
x9324
1750B
Maximum Substring
brute force
,
greedy
,
implementation
800
x15996
1750A
Indirect Sort
constructive algorithms
,
implementation
,
math
800
x16852
1749F
Distance to the Path
data structures
,
dfs and similar
,
trees
2800
x479
1749E
Cactus Wall
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1632
1749D
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
1900
x5328
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x13495
1749B
Death's Blessing
greedy
900
x20452
1749A
Cowardly Rooks
greedy
,
implementation
800
x22085
1748F
Circular Xor Reversal
bitmasks
,
constructive algorithms
3000
x326
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1747
1748D
ConstructOR
bitmasks
,
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
math
,
number theory
2100
x2685
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x10566
1748B
Diverse Substrings
brute force
,
implementation
,
strings
1400
x14419
1748A
The Ultimate Square
math
800
x23611
1747E
List Generation
combinatorics
,
dp
,
math
2900
x489
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x4515
1747C
Swap Game
games
1200
x20493
1747B
BAN BAN
constructive algorithms
900
x21862
1747A
Two Groups
constructive algorithms
,
greedy
800
x24471
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x89
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x1564
1746E2
Joking (Hard Version)
dp
,
interactive
3200
x377
1746E1
Joking (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
ternary search
2500
x1376
1746D
Paths on the Tree
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1900
x4444
1746C
Permutation Operations
constructive algorithms
,
greedy
,
implementation
,
math
1300
x12420
1746B
Rebellion
constructive algorithms
,
greedy
,
two pointers
800
x16809
1746A
Maxmina
constructive algorithms
,
greedy
800
x19517
1744F
MEX vs MED
math
,
two pointers
2000
x2927
1744E2
Divisible Numbers (hard version)
brute force
,
math
,
number theory
1900
x5324
1744E1
Divisible Numbers (easy version)
brute force
,
math
,
number theory
1500
x10313
1744D
Divisibility by 2^n
greedy
,
math
,
sortings
1200
x20469
1744C
Traffic Light
binary search
,
implementation
,
two pointers
1000
x24694
1744B
Even-Odd Increments
implementation
,
math
800
x22931
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