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Before contest
Codeforces Round (Div. 1)
3 weeks
Before contest
Codeforces Round (Div. 2)
3 weeks
→ Filter Problems
Difficulty:
—
data structures
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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Problems
#
Name
2018E2
Complex Segments (Hard Version)
binary search
,
data structures
,
divide and conquer
,
dsu
,
greedy
,
math
,
sortings
x51
2018E1
Complex Segments (Easy Version)
binary search
,
data structures
,
divide and conquer
,
dsu
,
greedy
,
math
,
sortings
x81
2018D
Max Plus Min Plus Size
data structures
,
dp
,
dsu
,
greedy
,
implementation
,
matrices
x1117
2018C
Tree Pruning
brute force
,
data structures
,
dfs and similar
,
greedy
,
sortings
,
trees
x4405
2018B
Speedbreaker
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
x2647
2014H
Robin Hood Archery
data structures
,
divide and conquer
,
greedy
,
hashing
1900
x2705
2014G
Milky Days
brute force
,
data structures
,
greedy
,
implementation
2200
x922
2014D
Robert Hood and Mrs Hood
brute force
,
data structures
,
greedy
,
sortings
1400
x9696
2013F2
Game in Tree (Hard Version)
binary search
,
data structures
,
trees
3500
x64
2013F1
Game in Tree (Easy Version)
binary search
,
brute force
,
data structures
,
dp
,
games
,
greedy
,
implementation
,
trees
2700
x370
2011I
Stack and Queue
*special problem
,
data structures
,
divide and conquer
x2
2011F
Good Subarray
*special problem
,
data structures
,
greedy
x86
2009G3
Yunli's Subarray Queries (extreme version)
data structures
,
dp
,
implementation
2700
x270
2009G2
Yunli's Subarray Queries (hard version)
binary search
,
data structures
,
dp
2200
x1037
2009G1
Yunli's Subarray Queries (easy version)
binary search
,
data structures
,
two pointers
1900
x3387
2009F
Firefly's Queries
bitmasks
,
data structures
,
flows
,
math
1700
x5798
2008E
Alternating String
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
strings
1500
x8836
2007B
Index and Maximum Value
data structures
,
greedy
900
x19559
2006E
Iris's Full Binary Tree
brute force
,
data structures
,
dfs and similar
,
trees
3100
x200
2006D
Iris and Adjacent Products
data structures
,
greedy
,
implementation
,
math
2600
x597
2006C
Eri and Expanded Sets
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
2300
x1465
2006B
Iris and the Tree
brute force
,
data structures
,
dfs and similar
,
dsu
,
math
,
trees
1800
x2930
2005E2
Subtangle Game (Hard Version)
data structures
,
dp
,
games
,
greedy
,
implementation
2500
x662
2005D
Alter the GCD
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
number theory
2400
x715
2004G
Substring Compression
data structures
,
dp
,
matrices
3200
x275
2004F
Make a Palindrome
binary search
,
brute force
,
data structures
,
greedy
,
math
2600
x1061
2004D
Colored Portals
binary search
,
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
1600
x10034
2003F
Turtle and Three Sequences
brute force
,
data structures
,
dp
,
greedy
,
math
,
probabilities
,
two pointers
2800
x366
2003E2
Turtle and Inversions (Hard Version)
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
two pointers
2700
x476
2002E
Cosmic Rays
brute force
,
data structures
,
dp
2300
x2308
2002D2
DFS Checker (Hard Version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
2300
x2239
2002D1
DFS Checker (Easy Version)
brute force
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
1900
x4139
2001D
Longest Max Min Subsequence
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
1900
x4730
2000H
Ksyusha and the Loaded Set
binary search
,
brute force
,
data structures
,
implementation
2200
x1525
2000E
Photoshoot for Gorillas
combinatorics
,
data structures
,
greedy
,
math
1400
x12550
2000C
Numeric String Template
data structures
,
strings
1000
x24167
1998E2
Eliminating Balls With Merging (Hard Version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
2500
x643
1998E1
Eliminating Balls With Merging (Easy Version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
greedy
2200
x1724
1998D
Determine Winning Islands in Race
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
2100
x3097
1997E
Level Up
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
2200
x2952
1997C
Even Positions
constructive algorithms
,
data structures
,
greedy
1100
x21092
1996G
Penacony
brute force
,
data structures
,
graphs
,
greedy
,
hashing
2200
x1556
1996E
Decode
combinatorics
,
data structures
,
implementation
,
math
1600
x9096
1995E2
Let Me Teach You a Lesson (Hard Version)
data structures
,
dp
,
matrices
,
two pointers
2900
x287
1995E1
Let Me Teach You a Lesson (Easy Version)
2-sat
,
data structures
,
dp
,
matrices
,
two pointers
2700
x360
1995B2
Bouquet (Hard Version)
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1700
x8398
1990F
Polygonal Segments
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
,
two pointers
2800
x264
1990E2
Catch the Mole(Hard Version)
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
interactive
,
trees
2600
x825
1990E1
Catch the Mole(Easy Version)
binary search
,
data structures
,
dfs and similar
,
interactive
,
trees
2500
x890
1989D
Smithing Skill
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
,
two pointers
1900
x5740
1988E
Range Minimum Sum
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
2300
x1352
1987E
Wonderful Tree!
brute force
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2000
x3266
1986G2
Permutation Problem (Hard Version)
brute force
,
data structures
,
hashing
,
math
,
number theory
2500
x1027
1986G1
Permutation Problem (Simple Version)
binary search
,
brute force
,
combinatorics
,
data structures
,
math
,
number theory
2200
x1424
1986C
Update Queries
data structures
,
greedy
,
sortings
1100
x22336
1986B
Matrix Stabilization
brute force
,
data structures
,
greedy
,
sortings
1000
x25981
1985H2
Maximize the Largest Component (Hard Version)
data structures
,
dfs and similar
,
dp
,
dsu
,
implementation
2200
x1475
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
1700
x5402
1985F
Final Boss
binary search
,
data structures
1500
x14742
1983F
array-value
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
2500
x1124
1983D
Swap Dilemma
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
math
,
sortings
1700
x7936
1982F
Sorting Problem Again
binary search
,
data structures
,
sortings
2600
x904
1982D
Beauty of the mountains
brute force
,
data structures
,
implementation
,
math
,
number theory
1700
x6902
1982C
Boring Day
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1200
x16923
1981F
Turtle and Paths on a Tree
data structures
,
dp
,
trees
3000
x251
1981E
Turtle and Intersected Segments
data structures
,
dsu
,
graphs
,
greedy
2600
x807
1980G
Yasya and the Mysterious Tree
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
strings
,
trees
2300
x1197
1980F1
Field Division (easy version)
data structures
,
math
,
sortings
1900
x3629
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x10159
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x1400
1978F
Large Graph
data structures
,
dfs and similar
,
dsu
,
graphs
,
number theory
,
two pointers
2400
x1283
1978E
Computing Machine
brute force
,
data structures
,
dp
,
greedy
,
implementation
2000
x3671
1978D
Elections
data structures
,
greedy
,
implementation
,
math
1600
x10900
1978C
Manhattan Permutations
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1300
x14512
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x6567
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
2800
x540
1976E
Splittable Permutations
combinatorics
,
data structures
,
dfs and similar
,
greedy
,
math
,
trees
2500
x998
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x4195
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x2218
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
2000
x4127
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3491
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x15408
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x13689
1971G
XOUR
data structures
,
dsu
,
sortings
1700
x8955
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1335
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x4428
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1912
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x4148
1968F
Equal XOR Segments
binary search
,
data structures
1800
x5336
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x64
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1706
1965F
Conference
data structures
,
flows
3300
x167
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x428
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x476
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x340
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x21346
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x15064
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x27324
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x2192
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x754
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