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Before contest
Codeforces Round 978 (Div. 2)
6 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
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x490
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1859
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3582
1175D
Array Splitting
greedy
,
sortings
1900
x6203
1175C
Electrification
binary search
,
brute force
,
greedy
1600
x6779
1175B
Catch Overflow!
data structures
,
expression parsing
,
implementation
1600
x10668
1175A
From Hero to Zero
implementation
,
math
900
x18219
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1721
1174E
Ehab and the Expected GCD Problem
combinatorics
,
dp
,
math
,
number theory
2500
x1438
1174D
Ehab and the Expected XOR Problem
bitmasks
,
constructive algorithms
1900
x4690
1174C
Ehab and a Special Coloring Problem
constructive algorithms
,
number theory
1300
x11997
1174B
Ehab Is an Odd Person
sortings
1200
x15465
1174A
Ehab Fails to Be Thanos
constructive algorithms
,
greedy
,
sortings
1000
x17628
1173B
Nauuo and Chess
constructive algorithms
,
greedy
1100
x9075
1173A
Nauuo and Votes
greedy
800
x16217
1172F
Nauuo and Bug
data structures
3300
x430
1172E
Nauuo and ODT
data structures
3300
x309
1172D
Nauuo and Portals
constructive algorithms
2900
x501
1172C2
Nauuo and Pictures (hard version)
dp
,
probabilities
2600
x845
1172C1
Nauuo and Pictures (easy version)
dp
,
probabilities
2300
x1080
1172B
Nauuo and Circle
combinatorics
,
dfs and similar
,
dp
,
trees
1900
x4040
1172A
Nauuo and Cards
greedy
,
implementation
1800
x4984
1170I
Good Subsets
*special problem
,
dp
x40
1170H
Longest Saw
*special problem
,
constructive algorithms
x48
1170G
Graph Decomposition
*special problem
,
graphs
x74
1170F
Wheels
*special problem
,
binary search
,
greedy
x122
1170E
Sliding Doors
*special problem
,
binary search
x261
1170D
Decoding of Integer Sequences
*special problem
,
data structures
,
implementation
x431
1170C
Minus and Minus Give Plus
*special problem
,
implementation
,
strings
x794
1170B
Bad Days
*special problem
,
implementation
x1086
1170A
Three Integers Again
*special problem
,
math
x1474
1169B
Pairs
graphs
,
implementation
1500
x9754
1169A
Circle Metro
implementation
,
math
900
x11880
1168E
Xor Permutations
constructive algorithms
,
math
3100
x375
1168D
Anagram Paths
dp
,
implementation
,
trees
3000
x344
1168C
And Reachability
bitmasks
,
dp
2200
x2413
1168B
Good Triple
brute force
,
two pointers
1900
x3565
1168A
Increasing by Modulo
binary search
,
greedy
1700
x6829
1167G
Low Budget Inception
brute force
,
geometry
3100
x149
1167F
Scalar Queries
combinatorics
,
data structures
,
math
,
sortings
2300
x1634
1167E
Range Deleting
binary search
,
combinatorics
,
data structures
,
two pointers
2100
x2663
1167D
Bicolored RBS
constructive algorithms
,
greedy
1500
x6955
1167C
News Distribution
dfs and similar
,
dsu
,
graphs
1400
x18440
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x11677
1167A
Telephone Number
brute force
,
greedy
,
strings
800
x19282
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x703
1166E
The LCMs Must be Large
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2100
x2829
1166D
Cute Sequences
binary search
,
brute force
,
greedy
,
math
2200
x2164
1166C
A Tale of Two Lands
binary search
,
sortings
,
two pointers
1500
x9614
1166B
All the Vowels Please
constructive algorithms
,
math
,
number theory
1100
x11479
1166A
Silent Classroom
combinatorics
,
greedy
900
x14199
1165F2
Microtransactions (hard version)
binary search
,
greedy
,
implementation
2000
x2182
1165F1
Microtransactions (easy version)
binary search
,
greedy
2000
x1899
1165E
Two Arrays and Sum of Functions
greedy
,
math
,
sortings
1600
x8317
1165D
Almost All Divisors
math
,
number theory
1600
x16047
1165C
Good String
greedy
1300
x12936
1165B
Polycarp Training
data structures
,
greedy
,
sortings
1000
x20937
1165A
Remainder
implementation
,
math
1100
x13782
1163F
Indecisive Taxi Fee
data structures
,
graphs
,
shortest paths
3000
x884
1163E
Magical Permutation
bitmasks
,
brute force
,
constructive algorithms
,
data structures
,
graphs
,
math
2400
x672
1163D
Mysterious Code
dp
,
strings
2100
x1273
1163C2
Power Transmission (Hard Edition)
data structures
,
geometry
,
implementation
,
math
1900
x3625
1163C1
Power Transmission (Easy Edition)
brute force
,
geometry
1900
x3316
1163B2
Cat Party (Hard Edition)
data structures
,
implementation
1600
x7220
1163B1
Cat Party (Easy Edition)
data structures
,
implementation
1500
x6976
1163A
Eating Soup
greedy
,
math
900
x12960
1162B
Double Matrix
brute force
,
greedy
1400
x5804
1162A
Zoning Restrictions Again
implementation
800
x8261
1160A2
Collaboration
*special problem
1159B
Expansion coefficient of the array
implementation
,
math
1300
x7057
1159A
A pile of stones
implementation
,
math
800
x12666
1158F
Density of subarrays
dp
,
math
3500
x410
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x151
1158D
Winding polygonal line
constructive algorithms
,
geometry
,
greedy
,
math
2600
x836
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1939
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2228
1158A
The Party and Sweets
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
1500
x7146
1157G
Inverse of Rows and Columns
brute force
,
constructive algorithms
2200
x920
1157F
Maximum Balanced Circle
constructive algorithms
,
dp
,
greedy
,
two pointers
2000
x2636
1157E
Minimum Array
binary search
,
data structures
,
greedy
1700
x8377
1157D
N Problems During K Days
constructive algorithms
,
greedy
,
math
1900
x3753
1157C2
Increasing Subsequence (hard version)
greedy
1700
x7996
1157C1
Increasing Subsequence (easy version)
greedy
1300
x12624
1157B
Long Number
greedy
1300
x14696
1157A
Reachable Numbers
implementation
1100
x15654
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x132
1156F
Card Bag
dp
,
math
,
probabilities
2300
x1397
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x3020
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3901
1156C
Match Points
binary search
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x6088
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x6223
1156A
Inscribed Figures
geometry
1400
x8206
1155F
Delivery Oligopoly
brute force
,
dp
,
graphs
2800
x419
1155E
Guess the Root
brute force
,
interactive
,
math
2200
x1438
1155D
Beautiful Array
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
1900
x6919
1155C
Alarm Clocks Everywhere
math
,
number theory
1300
x9230
1155B
Game with Telephone Numbers
games
,
greedy
,
implementation
1200
x11884
1155A
Reverse a Substring
implementation
,
sortings
,
strings
1000
x15016
1154G
Minimum Possible LCM
brute force
,
greedy
,
math
,
number theory
2200
x2745
1154F
Shovels Shop
dp
,
greedy
,
sortings
2100
x2842
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