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Codeforces Round (Div. 2)
4 days
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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
1617B
GCD Problem
brute force
,
constructive algorithms
,
math
,
number theory
900
x23329
1617A
Forbidden Subsequence
constructive algorithms
,
greedy
,
sortings
,
strings
800
x16274
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x944
1616G
Just Add an Edge
dfs and similar
,
dp
,
graphs
3500
x280
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x593
1616E
Lexicographically Small Enough
brute force
,
data structures
,
greedy
,
strings
2200
x2482
1616D
Keep the Average High
dp
,
greedy
,
math
2000
x4886
1616C
Representative Edges
brute force
,
geometry
,
implementation
,
math
1500
x12223
1616B
Mirror in the String
greedy
,
strings
1100
x19649
1616A
Integer Diversity
implementation
800
x22692
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x327
1615G
Maximum Adjacent Pairs
constructive algorithms
,
graph matchings
3300
x150
1615F
LEGOndary Grandmaster
combinatorics
,
dp
,
math
2800
x874
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1477
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1887
1615C
Menorah
brute force
,
graphs
,
greedy
,
math
1600
x8369
1615B
And It's Non-Zero
bitmasks
,
greedy
,
math
1300
x15938
1615A
Closing The Gap
greedy
,
math
800
x20743
1614E
Divan and a Cottage
binary search
,
data structures
2600
x826
1614D2
Divan and Kostomuksha (hard version)
dp
,
number theory
2300
x2339
1614D1
Divan and Kostomuksha (easy version)
dp
,
number theory
2100
x3884
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x10237
1614B
Divan and a New Project
constructive algorithms
,
sortings
1000
x19228
1614A
Divan and a Store
brute force
,
constructive algorithms
,
greedy
800
x23251
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x687
1613E
Crazy Robot
dfs and similar
,
graphs
2000
x5163
1613D
MEX Sequences
dp
,
math
1900
x4602
1613C
Poisoned Dagger
binary search
1200
x24429
1613B
Absent Remainder
greedy
,
implementation
,
sortings
1000
x21632
1613A
Long Comparison
implementation
,
math
900
x24485
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x840
1612F
Armor and Weapons
brute force
,
dp
,
greedy
,
shortest paths
2800
x611
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x2502
1612D
X-Magic Pair
math
,
number theory
1600
x9131
1612C
Chat Ban
binary search
,
math
1300
x17365
1612B
Special Permutation
constructive algorithms
,
greedy
900
x17194
1612A
Distance
brute force
,
constructive algorithms
800
x17652
1611G
Robot and Candies
data structures
,
graph matchings
,
greedy
2500
x644
1611F
ATM and Students
binary search
,
data structures
,
two pointers
1800
x6444
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3817
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x7264
1611D
Weights Assignment For Tree Edges
constructive algorithms
,
trees
1500
x9851
1611C
Polycarp Recovers the Permutation
constructive algorithms
1000
x18347
1611B
Team Composition: Programmers and Mathematicians
binary search
,
constructive algorithms
,
math
800
x29492
1611A
Make Even
constructive algorithms
,
math
800
x31396
1610I
Mashtali vs AtCoder
games
,
trees
3100
x283
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x495
1610G
AmShZ Wins a Bet
data structures
,
greedy
,
hashing
3300
x440
1610F
Mashtali: a Space Oddysey
constructive algorithms
,
dfs and similar
,
graphs
3000
x535
1610E
AmShZ and G.O.A.T.
binary search
,
brute force
,
greedy
,
implementation
,
math
2300
x1670
1610D
Not Quite Lee
combinatorics
,
dp
,
math
,
number theory
2000
x2702
1610C
Keshi Is Throwing a Party
binary search
,
greedy
1600
x11543
1610B
Kalindrome Array
greedy
,
two pointers
1100
x15859
1610A
Anti Light's Cell Guessing
math
900
x16084
1609H
Pushing Robots
3500
x92
1609G
A Stroll Around the Matrix
data structures
,
greedy
,
math
3000
x398
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x784
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x2075
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x7295
1609C
Complex Market Analysis
binary search
,
dp
,
implementation
,
number theory
,
schedules
,
two pointers
1400
x9730
1609B
William the Vigilant
implementation
,
strings
1100
x11687
1609A
Divide and Multiply
greedy
,
implementation
,
math
,
number theory
900
x17087
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x157
1608F
MEX counting
combinatorics
,
dp
,
implementation
3200
x595
1608E
The Cells on the Paper
binary search
,
implementation
,
sortings
2800
x434
1608D
Dominoes
combinatorics
,
fft
,
graphs
,
math
,
number theory
2400
x1391
1608C
Game Master
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
two pointers
1700
x6646
1608B
Build the Permutation
constructive algorithms
,
greedy
1200
x11683
1608A
Find Array
constructive algorithms
,
math
800
x19042
1607H
Banquet Preparations 2
greedy
,
sortings
,
two pointers
2200
x1238
1607G
Banquet Preparations 1
greedy
2200
x1560
1607F
Robot on the Board 2
brute force
,
dfs and similar
,
graphs
,
implementation
2300
x1942
1607E
Robot on the Board 1
implementation
1600
x9310
1607D
Blue-Red Permutation
greedy
,
math
,
sortings
1300
x16843
1607C
Minimum Extraction
brute force
,
sortings
1000
x24970
1607B
Odd Grasshopper
math
900
x26290
1607A
Linear Keyboard
implementation
,
strings
800
x37354
1606F
Tree Queries
brute force
,
dp
,
trees
2800
x560
1606E
Arena
combinatorics
,
dp
,
math
2100
x3522
1606D
Red-Blue Matrix
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1442
1606C
Banknotes
greedy
,
number theory
1400
x14147
1606B
Update Files
greedy
,
implementation
,
math
1100
x18659
1606A
AB Balance
strings
900
x24611
1605F
PalindORme
combinatorics
,
dp
2900
x305
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x1045
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2934
1605C
Dominant Character
brute force
,
greedy
,
implementation
,
strings
1400
x16946
1605B
Reverse Sort
greedy
,
sortings
1000
x18034
1605A
A.M. Deviation
math
,
number theory
800
x20607
1604B
XOR Specia-LIS-t
1100
x15644
1604A
Era
greedy
800
x21454
1603F
October 18, 2017
combinatorics
,
dp
,
implementation
,
math
2700
x280
1603E
A Perfect Problem
combinatorics
,
dp
,
math
3200
x432
1603D
Artistic Partition
divide and conquer
,
dp
,
number theory
3000
x674
1603C
Extreme Extension
dp
,
greedy
,
math
,
number theory
2300
x2036
1603B
Moderate Modular Mode
constructive algorithms
,
math
,
number theory
1600
x13536
1603A
Di-visible Confusion
constructive algorithms
,
math
,
number theory
1300
x16624
1602B
Divine Array
constructive algorithms
,
implementation
1100
x14088
1602A
Two Subsequences
implementation
800
x18976
1601F
Two Sorts
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
3400
x184
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