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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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Problems
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Status
Standings
Custom test
Problems
#
Name
1181A
Chunga-Changa
greedy
,
math
1000
x13610
1180B
Nick and Array
greedy
,
implementation
1500
x9554
1180A
Alex and a Rhombus
dp
,
implementation
,
math
800
x25166
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x175
1179D
Fedor Runs for President
data structures
,
dp
,
trees
2700
x835
1179C
Serge and Dining Room
binary search
,
data structures
,
graph matchings
,
greedy
,
implementation
,
math
,
trees
2200
x2049
1179B
Tolik and His Uncle
constructive algorithms
1800
x4374
1179A
Valeriy and Deque
data structures
,
implementation
1500
x10537
1178H
Stock Exchange
binary search
,
flows
,
graphs
3500
x230
1178G
The Awesomest Vertex
data structures
,
dfs and similar
3000
x442
1178F2
Long Colorful Strip
dp
2600
x894
1178F1
Short Colorful Strip
combinatorics
,
dfs and similar
,
dp
2200
x2101
1178E
Archaeology
brute force
,
constructive algorithms
,
greedy
,
strings
1900
x4319
1178D
Prime Graph
constructive algorithms
,
greedy
,
math
,
number theory
1500
x7393
1178C
Tiles
combinatorics
,
greedy
,
math
1300
x11938
1178B
WOW Factor
dp
,
strings
1300
x15309
1178A
Prime Minister
greedy
800
x10410
1177B
Digits Sequence (Hard Edition)
binary search
,
divide and conquer
,
implementation
1800
x2568
1177A
Digits Sequence (Easy Edition)
implementation
1000
x5745
1176F
Destroy it!
dp
,
implementation
,
sortings
2100
x2043
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x11073
1176D
Recover it!
dfs and similar
,
graphs
,
greedy
,
number theory
,
sortings
1800
x5279
1176C
Lose it!
dp
,
greedy
,
implementation
1300
x14212
1176B
Merge it!
math
1100
x17117
1176A
Divide it!
brute force
,
greedy
,
implementation
800
x22832
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
x1858
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3580
1175D
Array Splitting
greedy
,
sortings
1900
x6202
1175C
Electrification
binary search
,
brute force
,
greedy
1600
x6778
1175B
Catch Overflow!
data structures
,
expression parsing
,
implementation
1600
x10666
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
x15464
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
x16216
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
1169B
Pairs
graphs
,
implementation
1500
x9751
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
x3564
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
x18436
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x11676
1167A
Telephone Number
brute force
,
greedy
,
strings
800
x19281
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
x8315
1165D
Almost All Divisors
math
,
number theory
1600
x16045
1165C
Good String
greedy
1300
x12936
1165B
Polycarp Training
data structures
,
greedy
,
sortings
1000
x20934
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
x12959
1162B
Double Matrix
brute force
,
greedy
1400
x5804
1162A
Zoning Restrictions Again
implementation
800
x8261
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
x2635
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
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