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Codeforces Round (Div. 3)
30:35:36
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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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Problems
#
Name
1811B
Conveyor Belts
implementation
,
math
1000
x19698
1811A
Insert Digit
greedy
,
math
,
strings
800
x29960
1810H
Last Number
combinatorics
,
math
2900
x129
1810G
The Maximum Prefix
dp
3200
x629
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x535
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x2961
1810D
Climbing the Tree
binary search
,
math
1700
x7063
1810C
Make It Permutation
brute force
,
greedy
,
sortings
1300
x13760
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17123
1810A
Beautiful Sequence
brute force
,
greedy
800
x20327
1809G
Prediction
combinatorics
,
dp
,
math
2800
x410
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x704
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x789
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x5872
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x11884
1809B
Points on Plane
binary search
,
greedy
,
math
1000
x19003
1809A
Garland
implementation
800
x23391
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x417
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x645
1808E1
Minibuses on Venus (easy version)
combinatorics
,
divide and conquer
,
dp
2200
x1249
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2157
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x3565
1808B
Playing in a Casino
math
,
sortings
1200
x14585
1808A
Lucky Numbers
brute force
,
implementation
900
x17287
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x17624
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x17793
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x5858
1807E
Interview
binary search
,
implementation
,
interactive
1300
x11804
1807D
Odd Queries
data structures
,
implementation
900
x28531
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x29100
1807B
Grab the Candies
greedy
800
x39647
1807A
Plus or Minus
implementation
800
x55430
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x265
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x328
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2676
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x842
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7180
1806B
Mex Master
constructive algorithms
,
greedy
900
x17013
1806A
Walking Master
geometry
,
greedy
,
math
800
x22204
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x320
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x809
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1521
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x6026
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x11983
1805B
The String Has a Target
greedy
,
strings
800
x18159
1805A
We Need the Zero
bitmasks
,
brute force
800
x20927
1804H
Code Lock
bitmasks
,
dp
3300
x169
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x193
1804F
Approximate Diameter
binary search
,
divide and conquer
,
graphs
,
shortest paths
2700
x849
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1354
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4413
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11487
1804B
Vaccination
greedy
,
implementation
1000
x13763
1804A
Lame King
greedy
,
math
800
x17661
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x12884
1802A
Likes
greedy
,
implementation
800
x15504
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x339
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x544
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x432
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2034
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3209
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x5779
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8094
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1924
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3675
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12000
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12112
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21630
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x21265
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x22307
1800B
Count the Number of Pairs
greedy
,
strings
1000
x23884
1800A
Is It a Cat?
implementation
,
strings
800
x29926
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x270
1799G
Count Voting
combinatorics
,
dp
,
math
2600
x696
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x766
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1152
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2264
1799D1
Hot Start Up (easy version)
dp
1900
x4059
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x5441
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x10797
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11347
1798F
Gifts from Grandfather Ahmed
dp
,
math
,
number theory
2500
x467
1798E
Multitest Generator
brute force
,
dp
2300
x1495
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x9000
1798C
Candy Store
greedy
,
math
,
number theory
1700
x7759
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x15851
1798A
Showstopper
greedy
,
implementation
,
sortings
800
x19316
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x328
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1185
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3690
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7206
1797B
Li Hua and Pattern
constructive algorithms
,
greedy
1100
x14474
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x16915
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x167
1796E
Colored Subgraphs
dfs and similar
,
dp
,
games
,
greedy
,
trees
2500
x685
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x3871
1796C
Maximum Set
binary search
,
math
1600
x9740
1796B
Asterisk-Minor Template
implementation
,
strings
1000
x16004
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18547
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x648
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