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Before contest
Codeforces Round #793 (Div. 2)
2 days
→ Filter Problems
Difficulty:
—
greedy
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
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Status
Standings
Custom test
Problems
#
Name
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x1232
1684D
Traps
constructive algorithms
,
constructive algorithms
,
greedy
,
sortings
1700
x4001
1680E
Moving Chips
bitmasks
,
dp
,
greedy
2000
x2044
1680D
Dog Walking
brute force
,
greedy
,
math
2400
x580
1680C
Binary String
binary search
,
greedy
,
strings
,
two pointers
1600
x5025
1679A
AvtoBus
brute force
,
greedy
,
math
,
number theory
900
x11996
1678B2
Tokitsukaze and Good 01-String (hard version)
dp
,
greedy
,
implementation
1800
x4078
1677C
Tokitsukaze and Two Colorful Tapes
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1900
x1863
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x8104
1676E
Eating Queries
binary search
,
greedy
,
sortings
1100
x12833
1676D
X-Sum
brute force
,
greedy
,
implementation
1000
x13528
1676C
Most Similar Words
brute force
,
greedy
,
implementation
,
implementation
,
math
,
strings
800
x18277
1676B
Equal Candies
greedy
,
math
,
sortings
800
x23688
1675F
Vlad and Unfinished Business
dfs and similar
,
dp
,
greedy
,
trees
1800
x2480
1675E
Replace With the Previous, Minimize
dsu
,
greedy
,
strings
1500
x5476
1675B
Make It Increasing
greedy
,
implementation
900
x15051
1675A
Food for Animals
greedy
,
math
800
x20133
1674F
Desktop Rearrangement
data structures
,
greedy
,
implementation
1800
x3086
1674E
Breaking the Wall
binary search
,
brute force
,
constructive algorithms
,
greedy
,
math
2000
x4025
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x500
1673B
A Perfectly Balanced String?
brute force
,
greedy
,
strings
1100
x10048
1673A
Subtle Substring Subtraction
games
,
greedy
,
strings
800
x14777
1672I
PermutationForces
data structures
,
greedy
3000
x56
1672H
Zigu Zagu
constructive algorithms
,
data structures
,
greedy
2700
x512
1672F1
Array Shuffling
constructive algorithms
,
graphs
,
greedy
2000
x2051
1672E
notepad.exe
binary search
,
constructive algorithms
,
greedy
,
interactive
2200
x1571
1672D
Cyclic Rotation
constructive algorithms
,
greedy
,
implementation
,
two pointers
1700
x4061
1672C
Unequal Array
constructive algorithms
,
greedy
,
implementation
1100
x9254
1671D
Insert a Progression
brute force
,
constructive algorithms
,
greedy
1600
x4547
1671C
Dolce Vita
binary search
,
brute force
,
greedy
,
math
1200
x9894
1670D
Very Suspicious
binary search
,
brute force
,
geometry
,
greedy
,
implementation
,
math
1700
x3158
1670A
Prof. Slim
greedy
,
implementation
,
sortings
800
x11919
1669H
Maximal AND
bitmasks
,
greedy
,
math
1300
x8982
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x12761
1669C
Odd/Even Increments
greedy
,
greedy
,
implementation
,
math
800
x21513
1668B
Social Distance
greedy
,
math
,
sortings
900
x11926
1667A
Make it Increasing
brute force
,
greedy
,
math
1300
x9733
1666E
Even Split
binary search
,
constructive algorithms
,
greedy
,
math
2500
x389
1666D
Deletive Editing
greedy
900
x3749
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x908
1665C
Tree Infection
binary search
,
greedy
,
sortings
,
trees
1600
x5383
1665B
Array Cloning Technique
constructive algorithms
,
greedy
,
sortings
900
x14082
1662G
Gastronomic Event
dp
,
greedy
,
trees
x215
1662D
Evolution of Weasels
greedy
,
implementation
,
strings
x689
1662B
Toys
greedy
,
strings
x90
1661F
Teleporters
binary search
,
greedy
2600
x329
1661D
Progressions Covering
data structures
,
greedy
1900
x3002
1661C
Water the Trees
binary search
,
greedy
,
math
1700
x6082
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x11068
1661A
Array Balancing
greedy
,
math
800
x15558
1660E
Matrix and Shifts
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x4687
1660C
Get an Even String
dp
,
greedy
,
strings
1300
x12770
1660A
Vasya and Coins
greedy
,
math
800
x26740
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x2547
1659C
Line Empire
binary search
,
brute force
,
dp
,
greedy
,
implementation
,
math
1500
x5980
1659B
Bit Flipping
bitmasks
,
constructive algorithms
,
greedy
,
strings
1300
x7194
1659A
Red Versus Blue
constructive algorithms
,
greedy
,
implementation
,
math
1000
x11555
1658F
Juju and Binary String
brute force
,
constructive algorithms
,
greedy
,
math
2700
x483
1657D
For Gamers. By Gamers.
binary search
,
brute force
,
greedy
,
math
,
sortings
2000
x3734
1657C
Bracket Sequence Deletion
greedy
,
implementation
1200
x13134
1657B
XY Sequence
greedy
800
x19693
1656F
Parametric MST
binary search
,
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
2600
x668
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x13248
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x167
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x599
1654C
Alice and the Cake
data structures
,
greedy
,
implementation
,
sortings
1400
x9687
1654A
Maximum Cake Tastiness
brute force
,
greedy
,
implementation
,
sortings
800
x15913
1651E
Sum of Matchings
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
greedy
,
math
2600
x352
1651B
Prove Him Wrong
constructive algorithms
,
greedy
800
x17419
1650F
Vitaly and Advanced Useless Algorithms
dp
,
greedy
,
implementation
2200
x971
1650E
Rescheduling the Exam
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1900
x3048
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x12621
1649B
Game of Ball Passing
greedy
,
implementation
1300
x9468
1647F
Madoka and Laziness
dp
,
greedy
3100
x219
1647E
Madoka and the Sixth-graders
data structures
,
dfs and similar
,
greedy
2500
x692
1647C
Madoka and Childish Pranks
constructive algorithms
,
greedy
1300
x9766
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x221
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x16878
1644C
Increase Subarray Sums
brute force
,
dp
,
greedy
,
implementation
1400
x9929
1642B
Power Walking
greedy
900
x13266
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x702
1641C
Anonymity Is Important
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2200
x1668
1641A
Great Sequence
brute force
,
greedy
,
sortings
1200
x13088
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x129
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x3248
1638A
Reverse
constructive algorithms
,
greedy
,
math
800
x19035
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x144
1637G
Birthday
constructive algorithms
,
greedy
,
math
3000
x304
1637F
Towers
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1237
1637D
Yet Another Minimization Problem
dp
,
greedy
,
math
1800
x5526
1637C
Andrew and Stones
greedy
,
implementation
1200
x13558
1637B
MEX and Array
brute force
,
dp
,
greedy
,
math
1100
x12891
1635F
Closest Pair
data structures
,
greedy
2800
x564
1635E
Cars
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2200
x1519
1635C
Differential Sorting
constructive algorithms
,
greedy
1200
x12313
1635B
Avoid Local Maximums
greedy
800
x15894
1635A
Min Or Sum
bitmasks
,
greedy
800
x17690
1634A
Reverse and Concatenate
greedy
,
strings
800
x20902
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1101
1633D
Make Them Equal
dp
,
greedy
1600
x8815
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