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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
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combine-tags-by-or
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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
1472G
Moving to the Capital
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x4381
545E
Paths and Trees
graphs
,
greedy
,
shortest paths
2000
x4369
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4352
1538G
Gift Set
binary search
,
greedy
,
math
,
ternary search
2100
x4339
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4325
1525C
Robot Collisions
data structures
,
greedy
,
implementation
,
sortings
2000
x4320
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x4314
1365F
Swaps Again
constructive algorithms
,
implementation
,
sortings
2100
x4296
1360H
Binary Median
binary search
,
bitmasks
,
brute force
,
constructive algorithms
2100
x4275
1521C
Nastia and a Hidden Permutation
constructive algorithms
,
interactive
2000
x4268
1409F
Subsequences of Length Two
dp
,
strings
2100
x4259
578C
Weakness and Poorness
ternary search
2000
x4258
1702G2
Passable Paths (hard version)
data structures
,
dfs and similar
,
trees
2000
x4257
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4241
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4222
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x4217
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x4212
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4183
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x4177
1418D
Trash Problem
data structures
,
implementation
2100
x4161
792C
Divide by Three
dp
,
greedy
,
math
,
number theory
2000
x4161
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4154
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4151
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4143
1753C
Wish I Knew How to Sort
dp
,
math
,
probabilities
2000
x4137
864E
Fire
dp
,
sortings
2000
x4118
1257E
The Contest
data structures
,
dp
,
greedy
2000
x4109
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4105
514D
R2D2 and Droid Army
binary search
,
data structures
,
two pointers
2000
x4097
961D
Pair Of Lines
geometry
2000
x4088
1433G
Reducing Delivery Cost
brute force
,
graphs
,
shortest paths
2100
x4086
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4083
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4071
1514D
Cut and Stick
binary search
,
data structures
,
greedy
,
implementation
,
sortings
2000
x4069
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x4032
797E
Array Queries
brute force
,
data structures
,
dp
2000
x4029
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x4024
1389D
Segment Intersections
brute force
,
greedy
,
implementation
,
math
2100
x4018
1620D
Exact Change
brute force
,
constructive algorithms
,
greedy
2000
x4011
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4008
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x4008
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x4006
1117D
Magic Gems
dp
,
math
,
matrices
2100
x3997
1716C
Robot in a Hallway
data structures
,
dp
,
greedy
,
implementation
,
ternary search
2000
x3993
1082E
Increasing Frequency
binary search
,
dp
,
greedy
2000
x3979
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x3969
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x3957
1621D
The Winter Hike
constructive algorithms
,
greedy
,
math
2100
x3950
1733D2
Zero-One (Hard Version)
dp
,
greedy
2000
x3948
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x3948
767C
Garland
dfs and similar
,
graphs
,
greedy
,
trees
2000
x3939
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x3937
1872G
Replace With Product
brute force
,
greedy
,
math
2000
x3928
1223D
Sequence Sorting
dp
,
greedy
,
two pointers
2000
x3921
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3915
1000E
We Need More Bosses
dfs and similar
,
graphs
,
trees
2100
x3899
1479B2
Painting the Array II
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2100
x3887
1322B
Present
binary search
,
bitmasks
,
constructive algorithms
,
data structures
,
math
,
sortings
2100
x3881
1256E
Yet Another Division Into Teams
dp
,
greedy
,
sortings
2000
x3866
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x3865
629D
Babaei and Birthday Cake
data structures
,
dp
2000
x3856
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3850
777E
Hanoi Factory
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x3849
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x3844
486D
Valid Sets
dfs and similar
,
dp
,
math
,
trees
2100
x3844
543B
Destroying Roads
constructive algorithms
,
graphs
,
shortest paths
2100
x3824
1363D
Guess The Maximums
binary search
,
implementation
,
interactive
,
math
2100
x3820
1696E
Placing Jinas
combinatorics
,
math
2000
x3809
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3785
1237D
Balanced Playlist
binary search
,
data structures
,
implementation
2000
x3778
615D
Multipliers
math
,
number theory
2000
x3777
1626D
Martial Arts Tournament
binary search
,
brute force
,
greedy
,
math
2100
x3774
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3764
468B
Two Sets
2-sat
,
dfs and similar
,
dsu
,
graph matchings
,
greedy
2000
x3757
1301D
Time to Run
constructive algorithms
,
graphs
,
implementation
2000
x3749
734E
Anton and Tree
dfs and similar
,
dp
,
trees
2100
x3730
1641B
Repetitions Decoding
constructive algorithms
,
implementation
,
sortings
2000
x3716
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3691
1278D
Segment Tree
data structures
,
dsu
,
graphs
,
trees
2100
x3679
555B
Case of Fugitive
data structures
,
greedy
,
sortings
2000
x3676
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3670
1551E
Fixed Points
binary search
,
brute force
,
dp
2000
x3662
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3645
1614D1
Divan and Kostomuksha (easy version)
dp
,
number theory
2100
x3639
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3637
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3629
20B
Equation
math
2000
x3627
1333D
Challenges in school №41
brute force
,
constructive algorithms
,
games
,
graphs
,
greedy
,
implementation
,
sortings
2100
x3626
988E
Divisibility by 25
brute force
,
greedy
2100
x3625
1680E
Moving Chips
bitmasks
,
dp
,
greedy
2000
x3614
372C
Watching Fireworks is Fun
data structures
,
dp
,
math
2100
x3614
1299C
Water Balance
data structures
,
geometry
,
greedy
2100
x3605
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3570
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3552
1332E
Height All the Same
combinatorics
,
constructive algorithms
,
math
,
matrices
2100
x3549
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3524
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3517
446B
DZY Loves Modification
brute force
,
data structures
,
greedy
2000
x3511
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3505
1867E1
Salyg1n and Array (simple version)
constructive algorithms
,
interactive
,
math
2000
x3477
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