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Before contest
Codeforces Round (Div. 2)
6 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
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Custom test
Problems
#
Name
1618D
Array and Operations
dp
,
greedy
,
math
1300
x18920
1618C
Paint the Array
math
1100
x23034
1618B
Missing Bigram
implementation
800
x22615
1618A
Polycarp and Sums of Subsequences
math
,
sortings
800
x32276
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x871
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1788
1617D1
Too Many Impostors (easy version)
constructive algorithms
,
implementation
,
interactive
1800
x4680
1617C
Paprika and Permutation
binary search
,
greedy
,
math
,
sortings
1300
x14987
1617B
GCD Problem
brute force
,
constructive algorithms
,
math
,
number theory
900
x23340
1617A
Forbidden Subsequence
constructive algorithms
,
greedy
,
sortings
,
strings
800
x16275
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x946
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
x2483
1616D
Keep the Average High
dp
,
greedy
,
math
2000
x4888
1616C
Representative Edges
brute force
,
geometry
,
implementation
,
math
1500
x12237
1616B
Mirror in the String
greedy
,
strings
1100
x19658
1616A
Integer Diversity
implementation
800
x22700
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
x877
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1480
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1892
1615C
Menorah
brute force
,
graphs
,
greedy
,
math
1600
x8373
1615B
And It's Non-Zero
bitmasks
,
greedy
,
math
1300
x15956
1615A
Closing The Gap
greedy
,
math
800
x20749
1614E
Divan and a Cottage
binary search
,
data structures
2600
x826
1614D2
Divan and Kostomuksha (hard version)
dp
,
number theory
2300
x2348
1614D1
Divan and Kostomuksha (easy version)
dp
,
number theory
2100
x3894
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x10247
1614B
Divan and a New Project
constructive algorithms
,
sortings
1000
x19275
1614A
Divan and a Store
brute force
,
constructive algorithms
,
greedy
800
x23258
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x687
1613E
Crazy Robot
dfs and similar
,
graphs
2000
x5167
1613D
MEX Sequences
dp
,
math
1900
x4608
1613C
Poisoned Dagger
binary search
1200
x24477
1613B
Absent Remainder
greedy
,
implementation
,
sortings
1000
x21644
1613A
Long Comparison
implementation
,
math
900
x24493
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x841
1612F
Armor and Weapons
brute force
,
dp
,
greedy
,
shortest paths
2800
x612
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x2503
1612D
X-Magic Pair
math
,
number theory
1600
x9141
1612C
Chat Ban
binary search
,
math
1300
x17430
1612B
Special Permutation
constructive algorithms
,
greedy
900
x17200
1612A
Distance
brute force
,
constructive algorithms
800
x17655
1611G
Robot and Candies
data structures
,
graph matchings
,
greedy
2500
x645
1611F
ATM and Students
binary search
,
data structures
,
two pointers
1800
x6447
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3822
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x7272
1611D
Weights Assignment For Tree Edges
constructive algorithms
,
trees
1500
x9856
1611C
Polycarp Recovers the Permutation
constructive algorithms
1000
x18353
1611B
Team Composition: Programmers and Mathematicians
binary search
,
constructive algorithms
,
math
800
x29515
1611A
Make Even
constructive algorithms
,
math
800
x31410
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
x441
1610F
Mashtali: a Space Oddysey
constructive algorithms
,
dfs and similar
,
graphs
3000
x536
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
x2704
1610C
Keshi Is Throwing a Party
binary search
,
greedy
1600
x11566
1610B
Kalindrome Array
greedy
,
two pointers
1100
x15890
1610A
Anti Light's Cell Guessing
math
900
x16091
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
x2081
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x7302
1609C
Complex Market Analysis
binary search
,
dp
,
implementation
,
number theory
,
schedules
,
two pointers
1400
x9742
1609B
William the Vigilant
implementation
,
strings
1100
x11687
1609A
Divide and Multiply
greedy
,
implementation
,
math
,
number theory
900
x17092
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
x1392
1608C
Game Master
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
two pointers
1700
x6649
1608B
Build the Permutation
constructive algorithms
,
greedy
1200
x11715
1608A
Find Array
constructive algorithms
,
math
800
x19046
1607H
Banquet Preparations 2
greedy
,
sortings
,
two pointers
2200
x1240
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
x16847
1607C
Minimum Extraction
brute force
,
sortings
1000
x24987
1607B
Odd Grasshopper
math
900
x26353
1607A
Linear Keyboard
implementation
,
strings
800
x37374
1606F
Tree Queries
brute force
,
dp
,
trees
2800
x560
1606E
Arena
combinatorics
,
dp
,
math
2100
x3524
1606D
Red-Blue Matrix
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1449
1606C
Banknotes
greedy
,
number theory
1400
x14162
1606B
Update Files
greedy
,
implementation
,
math
1100
x18667
1606A
AB Balance
strings
900
x24672
1605F
PalindORme
combinatorics
,
dp
2900
x305
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x1050
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2935
1605C
Dominant Character
brute force
,
greedy
,
implementation
,
strings
1400
x16962
1605B
Reverse Sort
greedy
,
sortings
1000
x18043
1605A
A.M. Deviation
math
,
number theory
800
x20613
1604B
XOR Specia-LIS-t
1100
x15649
1604A
Era
greedy
800
x21465
1603F
October 18, 2017
combinatorics
,
dp
,
implementation
,
math
2700
x281
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