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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
42:30:32
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Difficulty:
—
greedy
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
#
Name
1264A
Beautiful Regional Contest
greedy
,
implementation
1500
x9823
1263B
PIN Codes
greedy
,
implementation
1400
x11103
1260E
Tournament
brute force
,
dp
,
greedy
2400
x1599
1260D
A Game with Traps
binary search
,
dp
,
greedy
,
sortings
1900
x3579
1260C
Infinite Fence
greedy
,
math
,
number theory
1700
x7858
1257G
Divisor Set
divide and conquer
,
fft
,
greedy
,
math
,
number theory
2600
x567
1257E
The Contest
data structures
,
dp
,
greedy
2000
x4109
1257D
Yet Another Monster Killing Problem
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
1700
x7190
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15527
1257A
Two Rival Students
greedy
,
math
800
x20003
1256E
Yet Another Division Into Teams
dp
,
greedy
,
sortings
2000
x3866
1256D
Binary String Minimizing
greedy
1500
x11690
1256C
Platforms Jumping
greedy
1700
x6633
1256B
Minimize the Permutation
greedy
1400
x12755
1254B2
Send Boxes to Alice (Hard Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
2100
x2925
1254B1
Send Boxes to Alice (Easy Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
1800
x4403
1254A
Feeding Chicken
constructive algorithms
,
greedy
,
implementation
1700
x4981
1253E
Antenna Coverage
data structures
,
dp
,
greedy
,
sortings
2200
x2615
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x8810
1253C
Sweets Eating
dp
,
greedy
,
math
,
sortings
1500
x13770
1253B
Silly Mistake
greedy
,
implementation
1400
x10895
1252H
Twin Buildings
greedy
,
implementation
1800
x2585
1252E
Songwriter
greedy
,
two pointers
2200
x1208
1251E2
Voting (Hard Version)
binary search
,
data structures
,
greedy
2400
x2345
1251E1
Voting (Easy Version)
data structures
,
dp
,
greedy
2300
x2085
1251D
Salary Changing
binary search
,
greedy
,
sortings
1900
x5605
1251C
Minimize The Integer
greedy
,
two pointers
1600
x11618
1251B
Binary Palindromes
greedy
,
strings
1400
x10711
1250N
Wires
dfs and similar
,
graphs
,
greedy
2000
x1541
1250L
Divide The Students
binary search
,
greedy
,
math
1500
x4014
1250J
The Parade
binary search
,
greedy
1800
x2843
1250I
Show Must Go On
binary search
,
brute force
,
greedy
,
shortest paths
3100
x126
1250G
Discarding Game
dp
,
greedy
,
two pointers
2300
x707
1250B
The Feast and the Bus
brute force
,
constructive algorithms
,
greedy
,
math
1800
x2558
1249D2
Too Many Segments (hard version)
data structures
,
greedy
,
sortings
1800
x4860
1249D1
Too Many Segments (easy version)
greedy
1800
x4796
1249C2
Good Numbers (hard version)
binary search
,
greedy
,
math
,
meet-in-the-middle
1500
x12187
1249C1
Good Numbers (easy version)
brute force
,
greedy
,
implementation
1300
x15027
1248D1
The World Is Just a Programming Task (Easy Version)
brute force
,
dp
,
greedy
,
implementation
2000
x2284
1248B
Grow The Tree
greedy
,
math
,
sortings
900
x16438
1245D
Shichikuji and Power Grid
dsu
,
graphs
,
greedy
,
shortest paths
,
trees
1900
x6844
1245B
Restricted RPS
constructive algorithms
,
dp
,
greedy
1200
x13421
1244G
Running in Pairs
constructive algorithms
,
greedy
,
math
2400
x1260
1244E
Minimizing Difference
binary search
,
constructive algorithms
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x4773
1239C
Queue in the Train
data structures
,
greedy
,
implementation
2300
x1304
1238G
Adilbek and the Watering System
data structures
,
greedy
,
sortings
2700
x387
1238C
Standard Free2play
dp
,
greedy
,
math
1600
x7089
1238B
Kill `Em All
greedy
,
sortings
1300
x13073
1237G
Balanced Distribution
data structures
,
dp
,
greedy
3500
x116
1237C2
Balanced Removals (Harder)
binary search
,
constructive algorithms
,
divide and conquer
,
greedy
,
implementation
,
sortings
1900
x4124
1237C1
Balanced Removals (Easier)
constructive algorithms
,
geometry
,
greedy
1700
x5853
1236D
Alice and the Doll
brute force
,
data structures
,
greedy
,
implementation
2300
x1642
1236C
Labs
constructive algorithms
,
greedy
,
implementation
1300
x9802
1236A
Stones
brute force
,
greedy
,
math
800
x15762
1231E
Middle-Out
constructive algorithms
,
greedy
,
strings
2200
x675
1231C
Increasing Matrix
greedy
1100
x3462
1230B
Ania and Minimizing
greedy
,
implementation
1000
x18276
1227D2
Optimal Subsequences (Hard Version)
data structures
,
greedy
1800
x4222
1227D1
Optimal Subsequences (Easy Version)
data structures
,
greedy
1600
x6116
1225G
To Make 1
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
3100
x521
1225F
Tree Factory
constructive algorithms
,
greedy
,
trees
2500
x863
1223D
Sequence Sorting
dp
,
greedy
,
two pointers
2000
x3922
1223C
Save the Nature
binary search
,
greedy
1600
x7680
1221B
Knights
constructive algorithms
,
greedy
1100
x11568
1221A
2048 Game
brute force
,
greedy
,
math
1000
x16284
1220E
Tourism
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2200
x2539
1220C
Substring Game in the Lesson
games
,
greedy
,
strings
1300
x9883
1218I
The Light Square
2-sat
,
dfs and similar
,
greedy
2100
x571
1218F
Workout plan
data structures
,
greedy
1500
x2874
1217E
Sum Queries?
data structures
,
greedy
,
implementation
,
math
2300
x1637
1217B
Zmei Gorynich
greedy
,
math
1600
x10893
1216F
Wi-Fi
data structures
,
dp
,
greedy
2100
x2325
1216B
Shooting
greedy
,
implementation
,
sortings
900
x17994
1215D
Ticket Game
games
,
greedy
,
math
1700
x5959
1215C
Swap Letters
constructive algorithms
,
greedy
1500
x10775
1215A
Yellow Cards
greedy
,
implementation
,
math
1000
x11240
1214F
Employment
greedy
,
sortings
2700
x421
1214C
Bad Sequence
data structures
,
greedy
1200
x12800
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2311
1211E
Double Permutation Inc.
*special problem
,
binary search
,
greedy
2000
x188
1211D
Teams
*special problem
,
binary search
,
greedy
,
math
2000
x222
1211C
Ice Cream
*special problem
,
greedy
,
sortings
1700
x473
1210B
Marcin and Training Camp
brute force
,
greedy
1700
x5660
1209H
Moving Walkways
data structures
,
greedy
,
math
3300
x133
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x2853
1209E2
Rotate Columns (hard version)
bitmasks
,
dp
,
greedy
,
sortings
2500
x1844
1209E1
Rotate Columns (easy version)
bitmasks
,
brute force
,
dp
,
greedy
,
sortings
2000
x2711
1209C
Paint the Digits
constructive algorithms
,
greedy
,
implementation
1500
x7214
1209A
Paint the Numbers
greedy
,
implementation
,
math
800
x11918
1208G
Polygons
greedy
,
math
,
number theory
2800
x719
1208F
Bits And Pieces
bitmasks
,
dfs and similar
,
dp
,
greedy
2600
x2086
1208D
Restore Permutation
binary search
,
data structures
,
greedy
,
implementation
1900
x4647
1207C
Gas Pipeline
dp
,
greedy
1500
x9525
1207B
Square Filling
constructive algorithms
,
greedy
,
implementation
1200
x12932
1207A
There Are Two Types Of Burgers
brute force
,
greedy
,
implementation
,
math
800
x21272
1205A
Almost Equal
constructive algorithms
,
greedy
,
math
1200
x13798
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x2969
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x2847
1204C
Anna, Svyatoslav and Maps
dp
,
graphs
,
greedy
,
shortest paths
1700
x6423
1204B
Mislove Has Lost an Array
greedy
,
math
900
x17086
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