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Before contest
Codeforces Round (Div. 2)
4 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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Problems
#
Name
1815C
Between
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2200
x1379
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2220
1815A
Ian and Array Sorting
greedy
,
math
1300
x10476
1814F
Communication Towers
brute force
,
divide and conquer
,
dsu
2700
x316
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x878
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x604
1814C
Search in Parallel
constructive algorithms
,
greedy
,
sortings
1500
x7612
1814B
Long Legs
brute force
,
math
1700
x7329
1814A
Coins
implementation
,
math
800
x20104
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1082
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x1313
1811F
Is It Flower?
dfs and similar
,
graphs
,
implementation
2100
x1190
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x8190
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x5178
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x15226
1811B
Conveyor Belts
implementation
,
math
1000
x16341
1811A
Insert Digit
greedy
,
math
,
strings
800
x24316
1810H
Last Number
combinatorics
,
math
2900
x80
1810G
The Maximum Prefix
dp
3200
x222
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x398
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x2228
1810D
Climbing the Tree
binary search
,
math
1700
x5498
1810C
Make It Permutation
brute force
,
greedy
,
sortings
1300
x10850
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x15100
1810A
Beautiful Sequence
brute force
,
greedy
800
x17910
1809G
Prediction
combinatorics
,
dp
,
math
2800
x258
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x544
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x600
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x4470
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x9110
1809B
Points on Plane
binary search
,
greedy
,
math
1000
x15973
1809A
Garland
implementation
800
x20985
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x265
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x434
1808E1
Minibuses on Venus (easy version)
combinatorics
,
divide and conquer
,
dp
2200
x874
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x1662
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x2714
1808B
Playing in a Casino
math
,
sortings
1200
x10262
1808A
Lucky Numbers
brute force
,
implementation
900
x13714
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x13863
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x14366
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x4317
1807E
Interview
binary search
,
implementation
,
interactive
1300
x8829
1807D
Odd Queries
data structures
,
implementation
900
x20697
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x23894
1807B
Grab the Candies
greedy
800
x31170
1807A
Plus or Minus
implementation
800
x36886
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x176
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x218
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2000
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x631
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x5712
1806B
Mex Master
constructive algorithms
,
greedy
900
x14392
1806A
Walking Master
geometry
,
greedy
,
math
800
x18403
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x215
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x528
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1123
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x4367
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x9404
1805B
The String Has a Target
greedy
,
strings
800
x15991
1805A
We Need the Zero
bitmasks
,
brute force
800
x16374
1804H
Code Lock
bitmasks
,
dp
3300
x111
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x140
1804F
Approximate Diameter
binary search
,
divide and conquer
,
graphs
,
shortest paths
2700
x628
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1131
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x3687
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x9287
1804B
Vaccination
greedy
,
implementation
1000
x11831
1804A
Lame King
greedy
,
math
800
x16198
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x10860
1802A
Likes
greedy
,
implementation
800
x13773
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x128
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x396
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x261
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x1394
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x2308
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x4406
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x6479
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1417
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x2709
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x8998
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x9249
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x15839
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x16871
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x17875
1800B
Count the Number of Pairs
greedy
,
strings
1000
x19386
1800A
Is It a Cat?
implementation
,
strings
800
x24014
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x173
1799G
Count Voting
combinatorics
,
dp
,
math
2600
x497
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x588
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x937
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x1755
1799D1
Hot Start Up (easy version)
dp
1900
x3019
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x4277
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x8626
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x10269
1798F
Gifts from Grandfather Ahmed
dp
,
math
,
number theory
2500
x334
1798E
Multitest Generator
brute force
,
dp
2300
x1188
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x6818
1798C
Candy Store
greedy
,
math
,
number theory
1700
x6354
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