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Codeforces Round 973 (Div. 2)
04:47:45
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Difficulty:
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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
1184C1
Heidi and the Turing Test (Easy)
implementation
1600
x2288
1184B3
The Doctor Meets Vader (Hard)
flows
,
shortest paths
2700
x173
1184B2
The Doctor Meets Vader (Medium)
flows
,
graph matchings
,
graphs
,
shortest paths
,
sortings
2200
x572
1184B1
The Doctor Meets Vader (Easy)
binary search
,
sortings
1400
x5231
1184A3
Heidi Learns Hashing (Hard)
fft
,
math
,
number theory
3100
x139
1184A2
Heidi Learns Hashing (Medium)
brute force
,
number theory
2100
x980
1184A1
Heidi Learns Hashing (Easy)
brute force
,
math
,
number theory
1200
x5936
1183H
Subsequences (hard version)
dp
,
strings
1900
x3164
1183G
Candy Box (hard version)
greedy
,
implementation
,
sortings
2000
x2359
1183F
Topforces Strikes Back
brute force
,
math
,
sortings
2100
x2011
1183E
Subsequences (easy version)
dp
,
graphs
,
implementation
,
shortest paths
2000
x4807
1183D
Candy Box (easy version)
greedy
,
sortings
1400
x14203
1183C
Computer Game
binary search
,
math
1400
x13945
1183B
Equalize Prices
math
900
x18466
1183A
Nearest Interesting Number
implementation
800
x24647
1182F
Maximum Sine
binary search
,
data structures
,
number theory
2700
x339
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x2803
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x828
1182C
Beautiful Lyrics
data structures
,
greedy
,
strings
1700
x4414
1182B
Plus from Picture
dfs and similar
,
implementation
,
strings
1300
x11126
1182A
Filling Shapes
dp
,
math
1000
x30862
1181E2
A Story of One Country (Hard)
brute force
,
greedy
,
sortings
3000
x280
1181E1
A Story of One Country (Easy)
brute force
,
divide and conquer
,
sortings
2500
x476
1181D
Irrigation
binary search
,
data structures
,
implementation
,
sortings
,
trees
,
two pointers
2200
x2362
1181C
Flag
brute force
,
combinatorics
,
dp
,
implementation
1900
x3119
1181B
Split a Number
greedy
,
implementation
,
strings
1500
x6301
1181A
Chunga-Changa
greedy
,
math
1000
x13549
1180B
Nick and Array
greedy
,
implementation
1500
x9537
1180A
Alex and a Rhombus
dp
,
implementation
,
math
800
x25101
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x174
1179D
Fedor Runs for President
data structures
,
dp
,
trees
2700
x827
1179C
Serge and Dining Room
binary search
,
data structures
,
graph matchings
,
greedy
,
implementation
,
math
,
trees
2200
x2035
1179B
Tolik and His Uncle
constructive algorithms
1800
x4359
1179A
Valeriy and Deque
data structures
,
implementation
1500
x10450
1178H
Stock Exchange
binary search
,
flows
,
graphs
3500
x230
1178G
The Awesomest Vertex
data structures
,
dfs and similar
3000
x441
1178F2
Long Colorful Strip
dp
2600
x890
1178F1
Short Colorful Strip
combinatorics
,
dfs and similar
,
dp
2200
x2097
1178E
Archaeology
brute force
,
constructive algorithms
,
greedy
,
strings
1900
x4312
1178D
Prime Graph
constructive algorithms
,
greedy
,
math
,
number theory
1500
x7384
1178C
Tiles
combinatorics
,
greedy
,
math
1300
x11905
1178B
WOW Factor
dp
,
strings
1300
x15185
1178A
Prime Minister
greedy
800
x10397
1177B
Digits Sequence (Hard Edition)
binary search
,
divide and conquer
,
implementation
1800
x2553
1177A
Digits Sequence (Easy Edition)
implementation
1000
x5657
1176F
Destroy it!
dp
,
implementation
,
sortings
2100
x2028
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x10993
1176D
Recover it!
dfs and similar
,
graphs
,
greedy
,
number theory
,
sortings
1800
x5268
1176C
Lose it!
dp
,
greedy
,
implementation
1300
x14186
1176B
Merge it!
math
1100
x17080
1176A
Divide it!
brute force
,
greedy
,
implementation
800
x22764
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x478
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1815
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3573
1175D
Array Splitting
greedy
,
sortings
1900
x6177
1175C
Electrification
binary search
,
brute force
,
greedy
1600
x6768
1175B
Catch Overflow!
data structures
,
expression parsing
,
implementation
1600
x10616
1175A
From Hero to Zero
implementation
,
math
900
x18172
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1713
1174E
Ehab and the Expected GCD Problem
combinatorics
,
dp
,
math
,
number theory
2500
x1418
1174D
Ehab and the Expected XOR Problem
bitmasks
,
constructive algorithms
1900
x4679
1174C
Ehab and a Special Coloring Problem
constructive algorithms
,
number theory
1300
x11985
1174B
Ehab Is an Odd Person
sortings
1200
x15403
1174A
Ehab Fails to Be Thanos
constructive algorithms
,
greedy
,
sortings
1000
x17571
1173B
Nauuo and Chess
constructive algorithms
,
greedy
1100
x9061
1173A
Nauuo and Votes
greedy
800
x16199
1172F
Nauuo and Bug
data structures
3300
x429
1172E
Nauuo and ODT
data structures
3300
x309
1172D
Nauuo and Portals
constructive algorithms
2900
x496
1172C2
Nauuo and Pictures (hard version)
dp
,
probabilities
2600
x836
1172C1
Nauuo and Pictures (easy version)
dp
,
probabilities
2300
x1069
1172B
Nauuo and Circle
combinatorics
,
dfs and similar
,
dp
,
trees
1900
x4022
1172A
Nauuo and Cards
greedy
,
implementation
1800
x4969
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
x260
1170D
Decoding of Integer Sequences
*special problem
,
data structures
,
implementation
x428
1170C
Minus and Minus Give Plus
*special problem
,
implementation
,
strings
x792
1170B
Bad Days
*special problem
,
implementation
x1083
1170A
Three Integers Again
*special problem
,
math
x1461
1169B
Pairs
graphs
,
implementation
1500
x9709
1169A
Circle Metro
implementation
,
math
900
x11851
1168E
Xor Permutations
constructive algorithms
,
math
3100
x374
1168D
Anagram Paths
dp
,
implementation
,
trees
3000
x344
1168C
And Reachability
bitmasks
,
dp
2200
x2388
1168B
Good Triple
brute force
,
two pointers
1900
x3554
1168A
Increasing by Modulo
binary search
,
greedy
1700
x6779
1167G
Low Budget Inception
brute force
,
geometry
3100
x149
1167F
Scalar Queries
combinatorics
,
data structures
,
math
,
sortings
2300
x1619
1167E
Range Deleting
binary search
,
combinatorics
,
data structures
,
two pointers
2100
x2655
1167D
Bicolored RBS
constructive algorithms
,
greedy
1500
x6933
1167C
News Distribution
dfs and similar
,
dsu
,
graphs
1400
x18229
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x11571
1167A
Telephone Number
brute force
,
greedy
,
strings
800
x19248
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x701
1166E
The LCMs Must be Large
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2100
x2819
1166D
Cute Sequences
binary search
,
brute force
,
greedy
,
math
2200
x2157
1166C
A Tale of Two Lands
binary search
,
sortings
,
two pointers
1500
x9581
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