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Please read
the new rule regarding the restriction on the use of AI tools
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Before contest
Codeforces Round 978 (Div. 2)
5 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
1227E
Arson In Berland Forest
binary search
,
graphs
,
graphs
,
shortest paths
2200
x1486
1227D2
Optimal Subsequences (Hard Version)
data structures
,
greedy
1800
x4349
1227D1
Optimal Subsequences (Easy Version)
data structures
,
greedy
1600
x6411
1227C
Messy
constructive algorithms
1700
x5526
1227B
Box
constructive algorithms
1200
x9658
1227A
Math Problem
math
1100
x9822
1225G
To Make 1
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
3100
x549
1225F
Tree Factory
constructive algorithms
,
greedy
,
trees
2500
x885
1225E
Rock Is Push
binary search
,
dp
2200
x1889
1225D
Power Products
hashing
,
math
,
number theory
1800
x8010
1225C
p-binary
bitmasks
,
brute force
,
math
1600
x8960
1225B2
TV Subscriptions (Hard Version)
implementation
,
two pointers
1300
x10609
1225B1
TV Subscriptions (Easy Version)
implementation
1000
x11903
1225A
Forgetting Things
math
900
x15811
1223G
Wooden Raft
binary search
,
math
,
number theory
3200
x250
1223F
Stack Exterminable Arrays
data structures
,
divide and conquer
,
dp
,
hashing
2600
x2052
1223E
Paint the Tree
dp
,
sortings
,
trees
2100
x2610
1223D
Sequence Sorting
dp
,
greedy
,
two pointers
2000
x4045
1223C
Save the Nature
binary search
,
greedy
1600
x8332
1223B
Strings Equalization
strings
1000
x14874
1223A
CME
math
800
x21608
1221G
Graph And Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
meet-in-the-middle
2900
x681
1221F
Choose a Square
binary search
,
data structures
,
sortings
2400
x1050
1221E
Game With String
games
2500
x1088
1221D
Make The Fence Great Again
dp
1800
x9105
1221C
Perfect Team
binary search
,
math
1200
x21074
1221B
Knights
constructive algorithms
,
greedy
1100
x11957
1221A
2048 Game
brute force
,
greedy
,
math
1000
x16839
1220G
Geolocation
geometry
3400
x54
1220F
Gardener Alex
binary search
,
data structures
2700
x695
1220E
Tourism
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2200
x2763
1220D
Alex and Julian
bitmasks
,
math
,
number theory
1900
x3899
1220C
Substring Game in the Lesson
games
,
greedy
,
strings
1300
x10209
1220B
Multiplication Table
math
,
number theory
1300
x11609
1220A
Cards
implementation
,
sortings
,
strings
800
x29737
1219G
Harvester
implementation
2000
x660
1219C
Periodic integer number
implementation
,
strings
1700
x1786
1218I
The Light Square
2-sat
,
dfs and similar
,
greedy
2100
x600
1218H
Function Composition
dfs and similar
2900
x115
1218G
Alpha planetary system
constructive algorithms
,
graphs
,
shortest paths
3000
x100
1218F
Workout plan
data structures
,
greedy
1500
x2958
1218E
Product Tuples
divide and conquer
,
fft
2500
x378
1218D
Xor Spanning Tree
divide and conquer
,
fft
,
graphs
2400
x498
1218C
Jumping Transformers
dp
2600
x180
1218B
Guarding warehouses
data structures
,
geometry
3000
x70
1218A
BubbleReactor
dp
,
graphs
2800
x131
1217F
Forced Online Queries Problem
data structures
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x592
1217E
Sum Queries?
data structures
,
greedy
,
implementation
,
math
2300
x1880
1217D
Coloring Edges
constructive algorithms
,
dfs and similar
,
graphs
2100
x5297
1217C
The Number Of Good Substrings
binary search
,
bitmasks
,
brute force
1700
x7450
1217B
Zmei Gorynich
greedy
,
math
1600
x11214
1217A
Creating a Character
binary search
,
math
1300
x15009
1216F
Wi-Fi
data structures
,
dp
,
greedy
2100
x2651
1216E2
Numerical Sequence (hard version)
binary search
,
math
2200
x1463
1216E1
Numerical Sequence (easy version)
binary search
,
brute force
,
math
1900
x3445
1216D
Swords
math
1300
x11144
1216C
White Sheet
geometry
,
math
1700
x9223
1216B
Shooting
greedy
,
implementation
,
sortings
900
x18416
1216A
Prefixes
strings
800
x18671
1215F
Radio Stations
2-sat
2700
x978
1215E
Marbles
bitmasks
,
dp
2200
x3029
1215D
Ticket Game
games
,
greedy
,
math
1700
x6154
1215C
Swap Letters
constructive algorithms
,
greedy
1500
x11200
1215B
The Number of Products
combinatorics
,
dp
,
implementation
1400
x12990
1215A
Yellow Cards
greedy
,
implementation
,
math
1000
x11536
1214H
Tiles Placement
constructive algorithms
,
dfs and similar
,
trees
2800
x393
1214G
Feeling Good
bitmasks
,
data structures
3200
x311
1214F
Employment
greedy
,
sortings
2700
x430
1214E
Petya and Construction Set
constructive algorithms
,
graphs
,
math
,
sortings
,
trees
2000
x2697
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x5181
1214C
Bad Sequence
data structures
,
greedy
1200
x13264
1214B
Badges
brute force
,
math
1100
x10845
1214A
Optimal Currency Exchange
brute force
,
math
1400
x9094
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x7270
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2597
1213E
Two Small Strings
brute force
,
constructive algorithms
1900
x5172
1213D2
Equalizing by Division (hard version)
brute force
,
math
,
sortings
1600
x11440
1213D1
Equalizing by Division (easy version)
brute force
,
implementation
1500
x11385
1213C
Book Reading
math
1200
x18445
1213B
Bad Prices
data structures
,
implementation
1100
x26640
1213A
Chips Moving
math
900
x24079
1211I
Unusual Graph
*special problem
,
graphs
3000
x40
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x45
1211G
King's Path
*special problem
,
math
,
trees
2500
x71
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x124
1211E
Double Permutation Inc.
*special problem
,
binary search
,
greedy
2000
x193
1211D
Teams
*special problem
,
binary search
,
greedy
,
math
2000
x229
1211C
Ice Cream
*special problem
,
greedy
,
sortings
1700
x486
1211B
Traveling Around the Golden Ring of Berland
*special problem
,
implementation
1500
x764
1211A
Three Problems
*special problem
,
implementation
1000
x1404
1210G
Mateusz and Escape Room
dp
3500
x168
1210F2
Marek and Matching (hard version)
brute force
,
probabilities
3200
x213
1210F1
Marek and Matching (easy version)
brute force
,
probabilities
3100
x205
1210E
Wojtek and Card Tricks
math
2700
x406
1210D
Konrad and Company Evaluation
graphs
2400
x1511
1210C
Kamil and Making a Stream
math
,
number theory
,
trees
2000
x3329
1210B
Marcin and Training Camp
brute force
,
greedy
1700
x5824
1210A
Anadi and Domino
brute force
,
graphs
1700
x5164
1209H
Moving Walkways
data structures
,
greedy
,
math
3300
x141
1209G2
Into Blocks (hard version)
data structures
3200
x442
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