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Codeforces Round (Div. 2)
4 days
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Difficulty:
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dp
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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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Custom test
Problems
#
Name
1015F
Bracket Substring
dp
,
strings
2300
x1574
1015E2
Stars Drawing (Hard Edition)
binary search
,
dp
,
greedy
1900
x4103
1015E1
Stars Drawing (Easy Edition)
brute force
,
dp
,
greedy
1700
x7022
1012F
Passports
dp
,
implementation
3400
x271
1012C
Hills
dp
1900
x3960
1007E
Mini Metro
dp
3400
x254
1006F
Xor-Paths
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2100
x7547
1005D
Polycarp and Div 3
dp
,
greedy
,
number theory
1500
x11707
1004E
Sonya and Ice Cream
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
trees
2400
x1338
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x1673
1000G
Two-Paths
data structures
,
dp
,
trees
2700
x820
1000D
Yet Another Problem On a Subsequence
combinatorics
,
dp
1900
x5277
999F
Cards and Joy
dp
2000
x3411
998B
Cutting
dp
,
greedy
,
sortings
1200
x14631
997B
Roman Digits
brute force
,
combinatorics
,
dp
,
greedy
,
math
2000
x3251
996A
Hit the Lottery
dp
,
greedy
800
x126314
995F
Cowmpany Cowmpensation
combinatorics
,
dp
,
math
,
trees
2700
x1882
993D
Compute Power
binary search
,
dp
,
greedy
2500
x869
991D
Bishwock
dp
,
greedy
1500
x7832
990G
GCD Counting
divide and conquer
,
dp
,
dsu
,
number theory
,
trees
2400
x2485
990F
Flow Control
dfs and similar
,
dp
,
greedy
,
trees
2400
x1153
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x355
988F
Rain and Umbrellas
dp
2100
x2875
987C
Three displays
brute force
,
dp
,
implementation
1400
x15405
985E
Pencils and Boxes
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2100
x4342
983C
Elevator
dp
,
graphs
,
shortest paths
2400
x1023
983B
XOR-pyramid
dp
1800
x6532
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x17360
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x502
981E
Addition on Segments
bitmasks
,
data structures
,
divide and conquer
,
dp
2200
x2706
981D
Bookshelves
bitmasks
,
dp
,
greedy
1900
x3611
980F
Cactus to Tree
dp
,
graphs
,
trees
2900
x244
980D
Perfect Groups
dp
,
math
,
number theory
2100
x3117
979E
Kuro and Topological Parity
dp
2400
x970
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x2312
977F
Consecutive Subsequence
dp
1700
x26825
965E
Short Code
data structures
,
dp
,
greedy
,
strings
,
trees
2200
x2084
963B
Destruction of a Tree
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x3083
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x27688
960G
Bandit Blues
combinatorics
,
dp
,
fft
,
math
2900
x1307
960F
Pathwalks
data structures
,
dp
,
graphs
2100
x3550
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x2434
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x3074
959E
Mahmoud and Ehab and the xor-MST
bitmasks
,
dp
,
graphs
,
implementation
,
math
1900
x3872
958E2
Guard Duty (medium)
binary search
,
dp
,
greedy
,
sortings
2200
x1242
958C3
Encryption (hard)
data structures
,
dp
2500
x792
958C2
Encryption (medium)
dp
2000
x1429
955F
Heaps
dp
,
trees
2600
x2038
954H
Path Counting
combinatorics
,
dp
2500
x837
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x1452
946G
Almost Increasing Array
data structures
,
dp
2500
x854
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x682
946D
Timetable
dp
1800
x5009
940E
Cashback
data structures
,
dp
,
greedy
,
math
2000
x4585
940B
Our Tanya is Crying Out Loud
dp
,
greedy
1400
x9643
939F
Cutlet
data structures
,
dp
2400
x1292
938F
Erasing Substrings
bitmasks
,
dp
,
greedy
2700
x685
936D
World of Tank
dp
,
greedy
3000
x407
936B
Sleepy Game
dfs and similar
,
dp
,
games
,
graphs
2100
x3515
935E
Fafa and Ancient Mathematics
dfs and similar
,
dp
,
trees
2300
x1020
933E
A Preponderant Reunion
constructive algorithms
,
dp
3200
x338
933A
A Twisty Movement
dp
1800
x5532
932G
Palindrome Partition
dp
,
string suffix structures
,
strings
2900
x1273
932F
Escape Through Leaf
data structures
,
dp
,
geometry
2700
x4473
932E
Team Work
combinatorics
,
dp
,
math
2400
x3707
932D
Tree
binary search
,
dp
,
trees
2200
x2106
930E
Coins Exhibition
data structures
,
dp
,
math
2900
x569
930C
Teodor is not a liar!
data structures
,
dp
1900
x2413
928B
Chat
*special problem
,
dp
1400
x2662
924F
Minimal Subset Difference
dp
3200
x461
924E
Wardrobe
dp
,
greedy
2700
x600
924C
Riverside Curio
data structures
,
dp
,
greedy
1700
x4366
922F
Divisibility
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x782
922E
Birds
dp
2200
x2592
920D
Tanks
dp
,
greedy
,
implementation
2400
x849
919D
Substring
dfs and similar
,
dp
,
graphs
1700
x13293
919B
Perfect Number
binary search
,
brute force
,
dp
,
implementation
,
number theory
1100
x32467
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x1547
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x490
917B
MADMAX
dfs and similar
,
dp
,
games
,
graphs
1700
x4090
917A
The Monster
dp
,
greedy
,
implementation
,
math
1800
x3699
915C
Permute Digits
dp
,
greedy
1700
x7658
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x352
914G
Sum the Fibonacci
bitmasks
,
divide and conquer
,
dp
,
fft
,
math
2600
x1289
914C
Travelling Salesman and Special Numbers
brute force
,
combinatorics
,
dp
1800
x4482
913F
Strongly Connected Tournament
dp
,
graphs
,
math
,
probabilities
2800
x852
913E
Logical Expression
bitmasks
,
dp
,
shortest paths
2400
x927
913C
Party Lemonade
bitmasks
,
dp
,
greedy
1600
x8646
910A
The Way to Home
dfs and similar
,
dp
,
greedy
,
implementation
800
x14602
909E
Coprocessor
dfs and similar
,
dp
,
graphs
,
greedy
1900
x2622
909C
Python Indentation
dp
1800
x5587
908G
New Year and Original Order
dp
,
math
2800
x1794
908E
New Year and Entity Enumeration
bitmasks
,
combinatorics
,
dp
,
math
2500
x880
908D
New Year and Arbitrary Arrangement
dp
,
math
,
probabilities
2200
x2799
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x602
906C
Party
bitmasks
,
brute force
,
dp
,
graphs
2400
x1595
903F
Clear The Matrix
bitmasks
,
dp
2200
x826
900E
Maximum Questions
data structures
,
dp
,
strings
2100
x1467
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x4016
895C
Square Subsets
bitmasks
,
combinatorics
,
dp
,
math
2000
x8021
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