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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
1768F
Wonderful Jump
dp
,
greedy
2900
x842
1768E
Partial Sorting
combinatorics
,
math
,
number theory
2300
x1881
1768D
Lucky Permutation
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1800
x7154
1768C
Elemental Decompress
constructive algorithms
,
greedy
,
implementation
,
sortings
1300
x14189
1768B
Quick Sort
greedy
,
math
900
x23091
1768A
Greatest Convex
greedy
,
math
,
number theory
800
x28913
1767F
Two Subtrees
data structures
,
trees
3100
x276
1767E
Algebra Flash
bitmasks
,
brute force
,
dp
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x928
1767D
Playoff
combinatorics
,
constructive algorithms
,
dp
,
greedy
,
math
1500
x9887
1767C
Count Binary Strings
data structures
,
dp
2100
x2649
1767B
Block Towers
data structures
,
greedy
,
sortings
800
x20355
1767A
Cut the Triangle
implementation
800
x20545
1766F
MCF
flows
2800
x268
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1195
1766D
Lucky Chains
math
,
number theory
1600
x8905
1766C
Hamiltonian Wall
dp
,
implementation
1300
x13654
1766B
Notepad#
implementation
1000
x21115
1766A
Extremely Round
brute force
,
implementation
800
x26618
1765N
Number Reduction
greedy
1500
x4773
1765M
Minimum LCM
math
,
number theory
1000
x15533
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x583
1765K
Torus Path
greedy
,
math
1500
x5796
1765J
Hero to Zero
graph matchings
,
math
2900
x197
1765I
Infinite Chess
implementation
,
shortest paths
2800
x188
1765H
Hospital Queue
binary search
,
graphs
,
greedy
,
implementation
2200
x1264
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x388
1765F
Chemistry Lab
dp
,
geometry
,
probabilities
2200
x600
1765E
Exchange
brute force
,
math
1000
x10063
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x4156
1765C
Card Guessing
combinatorics
,
dp
,
probabilities
2600
x387
1765B
Broken Keyboard
greedy
800
x9015
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x697
1764H
Doremy's Paint 2
data structures
3400
x191
1764G3
Doremy's Perfect DS Class (Hard Version)
binary search
,
interactive
3300
x462
1764G2
Doremy's Perfect DS Class (Medium Version)
binary search
,
interactive
3000
x530
1764G1
Doremy's Perfect DS Class (Easy Version)
binary search
,
interactive
2900
x589
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x961
1764E
Doremy's Number Line
dp
,
greedy
,
sortings
2400
x1231
1764D
Doremy's Pegging Game
combinatorics
,
dp
,
math
2000
x2764
1764C
Doremy's City Construction
graphs
,
greedy
1400
x9402
1764B
Doremy's Perfect Math Class
math
,
number theory
900
x15855
1764A
Doremy's Paint
greedy
800
x16592
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x477
1763E
Node Pairs
dp
,
graphs
,
math
,
number theory
2200
x1798
1763D
Valid Bitonic Permutations
combinatorics
,
dp
,
implementation
,
math
,
number theory
2200
x2053
1763C
Another Array Problem
brute force
,
constructive algorithms
,
greedy
2000
x6553
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x14611
1763A
Absolute Maximization
bitmasks
,
constructive algorithms
,
greedy
,
math
800
x15674
1762G
Unequal Adjacent Elements
constructive algorithms
,
sortings
3100
x102
1762F
Good Pairs
binary search
,
data structures
,
dp
2600
x651
1762E
Tree Sum
combinatorics
,
math
,
trees
2600
x660
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x3598
1762C
Binary Strings are Fun
combinatorics
,
math
1400
x9173
1762B
Make Array Good
constructive algorithms
,
implementation
,
number theory
,
sortings
1100
x16951
1762A
Divide and Conquer
greedy
,
math
,
number theory
800
x19057
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
x9584
1761B
Elimination of a Ring
constructive algorithms
,
greedy
,
implementation
1000
x13446
1761A
Two Permutations
brute force
,
constructive algorithms
800
x19676
1760G
SlavicG's Favorite Problem
bitmasks
,
dfs and similar
,
graphs
1700
x7352
1760F
Quests
binary search
,
greedy
,
sortings
1500
x12220
1760E
Binary Inversions
data structures
,
greedy
,
math
1100
x20303
1760D
Challenging Valleys
implementation
,
two pointers
1000
x23665
1760C
Advantage
data structures
,
implementation
,
sortings
800
x37047
1760B
Atilla's Favorite Problem
greedy
,
implementation
,
strings
800
x44489
1760A
Medium Number
implementation
,
sortings
800
x59134
1759G
Restore the Permutation
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
1900
x4480
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
x13603
1759C
Thermostat
greedy
,
math
,
shortest paths
1100
x17633
1759B
Lost Permutation
math
800
x22222
1759A
Yes-Yes?
implementation
,
strings
800
x29982
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
x7307
1758C
Almost All Multiples
greedy
,
number theory
1400
x13627
1758B
XOR = Average
constructive algorithms
900
x21258
1758A
SSeeeeiinngg DDoouubbllee
constructive algorithms
,
strings
800
x25184
1754B
Kevin and Permutation
constructive algorithms
,
greedy
,
math
800
x18890
1754A
Technical Support
greedy
800
x23198
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
x9553
1750B
Maximum Substring
brute force
,
greedy
,
implementation
800
x16233
1750A
Indirect Sort
constructive algorithms
,
implementation
,
math
800
x17059
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