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Before contest
Codeforces Round (Div. 2)
3 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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Status
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Custom test
Problems
#
Name
545E
Paths and Trees
graphs
,
greedy
,
shortest paths
2000
x3831
895C
Square Subsets
bitmasks
,
combinatorics
,
dp
,
math
2000
x3830
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x3798
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x3786
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x3783
1257E
The Contest
data structures
,
dp
,
greedy
2000
x3780
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x3749
1389D
Segment Intersections
brute force
,
greedy
,
implementation
,
math
2100
x3747
578C
Weakness and Poorness
ternary search
2000
x3734
1409F
Subsequences of Length Two
dp
,
strings
2100
x3731
837D
Round Subset
dp
,
math
2100
x3710
598E
Chocolate Bar
brute force
,
dp
2000
x3688
1223D
Sequence Sorting
dp
,
greedy
,
two pointers
2000
x3682
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x3656
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x3653
792C
Divide by Three
dp
,
greedy
,
math
,
number theory
2000
x3643
1514D
Cut and Stick
binary search
,
data structures
,
greedy
,
implementation
,
sortings
2000
x3627
864E
Fire
dp
,
sortings
2000
x3620
961D
Pair Of Lines
geometry
2000
x3615
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x3612
1621D
The Winter Hike
constructive algorithms
,
greedy
,
math
2100
x3609
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x3607
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x3605
1472G
Moving to the Capital
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x3599
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x3582
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x3577
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x3573
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x3571
1301D
Time to Run
constructive algorithms
,
graphs
,
implementation
2000
x3560
1433G
Reducing Delivery Cost
brute force
,
graphs
,
shortest paths
2100
x3556
1363D
Guess The Maximums
binary search
,
implementation
,
interactive
,
math
2100
x3542
514D
R2D2 and Droid Army
binary search
,
data structures
,
two pointers
2000
x3533
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3529
543B
Destroying Roads
constructive algorithms
,
graphs
,
shortest paths
2100
x3522
486D
Valid Sets
dfs and similar
,
dp
,
math
,
trees
2100
x3508
767C
Garland
dfs and similar
,
graphs
,
greedy
,
trees
2000
x3499
1479B2
Painting the Array II
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2100
x3485
1716C
Robot in a Hallway
data structures
,
dp
,
greedy
,
implementation
,
ternary search
2000
x3477
1237D
Balanced Playlist
binary search
,
data structures
,
implementation
2000
x3469
1333D
Challenges in school №41
brute force
,
constructive algorithms
,
games
,
graphs
,
greedy
,
implementation
,
sortings
2100
x3468
1256E
Yet Another Division Into Teams
dp
,
greedy
,
sortings
2000
x3467
629D
Babaei and Birthday Cake
data structures
,
dp
2000
x3453
555B
Case of Fugitive
data structures
,
greedy
,
sortings
2000
x3453
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x3452
1207F
Remainder Problem
brute force
,
data structures
,
implementation
2100
x3451
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x3444
777E
Hanoi Factory
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x3438
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x3438
1322B
Present
binary search
,
bitmasks
,
constructive algorithms
,
data structures
,
math
,
sortings
2100
x3423
615D
Multipliers
math
,
number theory
2000
x3416
1006F
Xor-Paths
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2100
x3406
1620D
Exact Change
brute force
,
constructive algorithms
,
greedy
2000
x3405
1641B
Repetitions Decoding
constructive algorithms
,
implementation
,
sortings
2000
x3379
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x3356
1117D
Magic Gems
dp
,
math
,
matrices
2100
x3343
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3333
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3312
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x3311
468B
Two Sets
2-sat
,
dfs and similar
,
dsu
,
graph matchings
,
greedy
2000
x3307
1626D
Martial Arts Tournament
binary search
,
brute force
,
greedy
,
math
2100
x3293
446B
DZY Loves Modification
brute force
,
data structures
,
greedy
2000
x3284
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3281
1278D
Segment Tree
data structures
,
dsu
,
graphs
,
trees
2100
x3278
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x3262
675C
Money Transfers
constructive algorithms
,
data structures
,
greedy
,
sortings
2100
x3257
1733D2
Zero-One (Hard Version)
dp
,
greedy
2000
x3248
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x3240
1702G2
Passable Paths (hard version)
data structures
,
dfs and similar
,
trees
2000
x3235
1299C
Water Balance
data structures
,
geometry
,
greedy
2100
x3213
1266D
Decreasing Debts
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
two pointers
2000
x3207
988E
Divisibility by 25
brute force
,
greedy
2100
x3207
1332E
Height All the Same
combinatorics
,
constructive algorithms
,
math
,
matrices
2100
x3201
1427D
Unshuffling a Deck
constructive algorithms
,
implementation
2000
x3190
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x3179
1696E
Placing Jinas
combinatorics
,
math
2000
x3167
734E
Anton and Tree
dfs and similar
,
dp
,
trees
2100
x3158
1551E
Fixed Points
binary search
,
brute force
,
dp
2000
x3145
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3121
797E
Array Queries
brute force
,
data structures
,
dp
2000
x3111
1614D1
Divan and Kostomuksha (easy version)
dp
,
number theory
2100
x3079
1680E
Moving Chips
bitmasks
,
dp
,
greedy
2000
x3078
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3069
1082E
Increasing Frequency
binary search
,
dp
,
greedy
2000
x3062
1458B
Glass Half Spilled
dp
2000
x3052
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3042
546E
Soldier and Traveling
flows
,
graphs
,
math
2100
x3030
1103B
Game with modulo
binary search
,
constructive algorithms
,
interactive
2000
x3012
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x2994
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x2983
487B
Strip
binary search
,
data structures
,
dp
,
two pointers
2000
x2976
1316D
Nash Matrix
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2000
x2973
1210C
Kamil and Making a Stream
math
,
number theory
,
trees
2000
x2968
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x2949
20B
Equation
math
2000
x2942
346B
Lucky Common Subsequence
dp
,
strings
2000
x2941
1553E
Permutation Shift
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
math
2100
x2937
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x2936
1288E
Messenger Simulator
data structures
2000
x2925
1419E
Decryption
constructive algorithms
,
implementation
,
math
,
number theory
2100
x2917
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x2913
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