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Before contest
Codeforces Round #792 (Div. 1 + Div. 2)
34:03:34
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Difficulty:
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brute force
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
1680D
Dog Walking
brute force
,
greedy
,
math
2400
x507
1680A
Minimums and Maximums
brute force
,
math
800
x14962
1679E
Typical Party in Dorm
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
strings
2400
x473
1679A
AvtoBus
brute force
,
greedy
,
math
,
number theory
900
x11181
1677A
Tokitsukaze and Strange Inequality
brute force
,
data structures
,
dp
1600
x4800
1676H1
Maximum Crossings (Easy Version)
brute force
1400
x6859
1676D
X-Sum
brute force
,
greedy
,
implementation
1000
x13227
1676C
Most Similar Words
brute force
,
greedy
,
implementation
,
implementation
,
math
,
strings
800
x17922
1674E
Breaking the Wall
binary search
,
brute force
,
constructive algorithms
,
greedy
,
math
2000
x3977
1673C
Palindrome Basis
brute force
,
dp
,
math
,
number theory
1500
x6547
1673B
A Perfectly Balanced String?
brute force
,
greedy
,
strings
1100
x9933
1671F
Permutation Counting
brute force
,
combinatorics
,
dp
,
fft
,
math
2700
x169
1671D
Insert a Progression
brute force
,
constructive algorithms
,
greedy
1600
x4501
1671C
Dolce Vita
binary search
,
brute force
,
greedy
,
math
1200
x9798
1671B
Consecutive Points Segment
brute force
,
math
,
sortings
1000
x12934
1670D
Very Suspicious
binary search
,
brute force
,
geometry
,
greedy
,
implementation
,
math
1700
x3095
1670B
Dorms War
brute force
,
implementation
,
strings
1100
x8595
1667A
Make it Increasing
brute force
,
greedy
,
math
1300
x9656
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x869
1666C
Connect the Points
brute force
,
constructive algorithms
,
geometry
1800
x1919
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x901
1662O
Circular Maze
brute force
,
dfs and similar
,
graphs
,
implementation
x552
1662I
Ice Cream Shop
brute force
,
implementation
,
sortings
x850
1662H
Boundary
brute force
,
math
x1324
1662A
Organizing SWERC
brute force
,
implementation
x2406
1661E
Narrow Components
brute force
,
data structures
,
dp
,
dsu
,
math
,
trees
2500
x614
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x11014
1660F1
Promising String (easy version)
brute force
,
implementation
,
math
,
strings
1700
x5001
1660E
Matrix and Shifts
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x4662
1660D
Maximum Product Strikes Back
brute force
,
implementation
,
math
,
two pointers
1600
x5369
1659E
AND-MEX Walk
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2200
x862
1659C
Line Empire
binary search
,
brute force
,
dp
,
greedy
,
implementation
,
math
1500
x5933
1658F
Juju and Binary String
brute force
,
constructive algorithms
,
greedy
,
math
2700
x481
1658D2
388535 (Hard Version)
bitmasks
,
brute force
,
data structures
,
math
2300
x1721
1657D
For Gamers. By Gamers.
binary search
,
brute force
,
greedy
,
math
,
sortings
2000
x3727
1657A
Integer Moves
brute force
,
math
800
x20345
1654E
Arithmetic Operations
brute force
,
data structures
,
graphs
,
math
2300
x1391
1654A
Maximum Cake Tastiness
brute force
,
greedy
,
implementation
,
sortings
800
x15873
1651F
Tower Defense
binary search
,
brute force
,
data structures
3000
x173
1651E
Sum of Matchings
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
greedy
,
math
2600
x352
1651C
Fault-tolerant Network
brute force
,
data structures
,
implementation
1500
x8039
1650D
Twist the Permutation
brute force
,
constructive algorithms
,
implementation
,
math
1300
x9486
1648B
Integral Array
brute force
,
constructive algorithms
,
data structures
,
math
1800
x4416
1647B
Madoka and the Elegant Gift
brute force
,
constructive algorithms
,
graphs
,
implementation
1200
x12105
1646E
Power Board
brute force
,
dp
,
math
,
number theory
2200
x1568
1646C
Factorials and Powers of Two
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
math
1500
x8851
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x16847
1644E
Expand the Path
brute force
,
combinatorics
,
data structures
,
implementation
,
math
1900
x2222
1644C
Increase Subarray Sums
brute force
,
dp
,
greedy
,
implementation
1400
x9907
1644B
Anti-Fibonacci Permutation
brute force
,
constructive algorithms
,
implementation
800
x18241
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x701
1641C
Anonymity Is Important
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2200
x1660
1641A
Great Sequence
brute force
,
greedy
,
sortings
1200
x13065
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x129
1638E
Colorful Operations
brute force
,
data structures
,
implementation
2400
x1233
1637E
Best Pair
binary search
,
brute force
,
implementation
2100
x2472
1637B
MEX and Array
brute force
,
dp
,
greedy
,
math
1100
x12881
1637A
Sorting Parts
brute force
,
sortings
800
x19642
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x900
1633C
Kill the Monster
brute force
,
math
1100
x15718
1633A
Div. 7
brute force
800
x24728
1632C
Strange Test
binary search
,
bitmasks
,
brute force
,
dp
,
math
1600
x9056
1629A
Download More RAM
brute force
,
greedy
,
sortings
800
x23640
1627D
Not Adding
brute force
,
dp
,
math
,
number theory
1900
x5769
1626D
Martial Arts Tournament
binary search
,
brute force
,
greedy
,
math
2100
x2967
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x694
1625B
Elementary Particles
brute force
,
greedy
,
sortings
1100
x13404
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x2922
1623B
Game on Ranges
brute force
,
dfs and similar
,
implementation
,
sortings
1100
x12060
1623A
Robot Cleaner
brute force
,
implementation
,
math
800
x17813
1622E
Math Test
bitmasks
,
brute force
,
greedy
2200
x1291
1622C
Set or Decrease
binary search
,
brute force
,
greedy
,
sortings
1600
x8513
1620D
Exact Change
brute force
,
constructive algorithms
,
greedy
2000
x3004
1620C
BA-String
brute force
,
dp
,
greedy
,
implementation
,
math
1800
x4892
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x705
1619F
Let's Play the Hat?
brute force
,
constructive algorithms
,
greedy
,
math
2000
x1536
1617B
GCD Problem
brute force
,
constructive algorithms
,
math
,
number theory
900
x15964
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x429
1616E
Lexicographically Small Enough
brute force
,
data structures
,
greedy
,
strings
2200
x1937
1616C
Representative Edges
brute force
,
geometry
,
implementation
,
math
1500
x9405
1615C
Menorah
brute force
,
graphs
,
greedy
,
math
1600
x6195
1614A
Divan and a Store
brute force
,
constructive algorithms
,
greedy
800
x20055
1612F
Armor and Weapons
brute force
,
dp
,
greedy
,
shortest paths
2800
x384
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x1737
1612A
Distance
brute force
,
constructive algorithms
800
x15408
1610E
AmShZ and G.O.A.T.
binary search
,
brute force
,
greedy
,
implementation
,
math
2300
x1228
1607F
Robot on the Board 2
brute force
,
dfs and similar
,
graphs
,
implementation
2300
x1548
1607C
Minimum Extraction
brute force
,
sortings
1000
x18535
1606F
Tree Queries
brute force
,
dp
,
trees
2800
x318
1606D
Red-Blue Matrix
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1130
1605C
Dominant Character
brute force
,
greedy
,
implementation
,
strings
1400
x11569
1600F
Party Organization
brute force
,
math
,
probabilities
2300
x298
1599J
Bob's Beautiful Array
bitmasks
,
brute force
,
greedy
2600
x215
1599G
Shortest path
brute force
,
geometry
,
math
,
shortest paths
2700
x292
1598F
RBS
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
2400
x958
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x1763
1598B
Groups
brute force
,
implementation
1000
x13026
1598A
Computer Game
brute force
,
dfs and similar
,
dp
,
implementation
800
x18227
1594E2
Rubik's Cube Coloring (hard version)
brute force
,
dp
,
implementation
,
math
,
trees
2300
x1191
1594C
Make Them Equal
brute force
,
greedy
,
math
,
strings
1200
x12851
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