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Codeforces Round 974 (Div. 3)
08:43:36
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Difficulty:
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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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Custom test
Problems
#
Name
1461F
Mathematical Expression
constructive algorithms
,
dp
,
greedy
2700
x546
1461E
Water Level
brute force
,
graphs
,
greedy
,
implementation
,
math
2200
x2104
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x9211
1461C
Random Events
dp
,
math
,
probabilities
1500
x11183
1461B
Find the Spruce
brute force
,
dp
,
implementation
1400
x12604
1461A
String Generation
constructive algorithms
,
greedy
800
x18564
1459B
Move and Turn
dp
,
math
1300
x14717
1459A
Red-Blue Shuffle
math
,
probabilities
800
x16984
1458F
Range Diameter Sum
data structures
,
trees
3500
x278
1458E
Nim Shortcuts
data structures
,
games
3100
x480
1458D
Flip and Reverse
data structures
,
graphs
,
greedy
3100
x1087
1458C
Latin Square
math
,
matrices
2700
x1306
1458B
Glass Half Spilled
dp
2000
x3526
1458A
Row GCD
math
,
number theory
1600
x17584
1456E
XOR-ranges
dp
,
greedy
3500
x277
1455G
Forbidden Value
data structures
,
dp
2900
x407
1455F
String and Operations
dp
,
greedy
2800
x442
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1517
1455D
Sequence and Swaps
dp
,
greedy
,
sortings
1600
x12292
1455C
Ping-pong
constructive algorithms
,
games
,
math
1100
x19559
1455B
Jumps
constructive algorithms
,
math
1200
x21771
1455A
Strange Functions
math
,
number theory
800
x26402
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x4023
1454E
Number of Simple Paths
combinatorics
,
dfs and similar
,
graphs
,
trees
2000
x5790
1454D
Number into Sequence
constructive algorithms
,
math
,
number theory
1300
x20361
1454C
Sequence Transformation
greedy
,
implementation
1200
x21407
1454B
Unique Bid Auction
implementation
800
x28267
1454A
Special Permutation
constructive algorithms
,
probabilities
800
x40433
1453F
Even Harder
dp
2700
x837
1453E
Dog Snacks
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x2031
1453D
Checkpoints
brute force
,
constructive algorithms
,
greedy
,
math
,
probabilities
1900
x4148
1453C
Triangles
greedy
,
implementation
1700
x6028
1453B
Suffix Operations
constructive algorithms
,
implementation
1400
x13318
1453A
Cancel the Trains
implementation
800
x22557
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x486
1452F
Divide Powers
constructive algorithms
,
greedy
2900
x316
1452E
Two Editorials
brute force
,
dp
,
greedy
,
sortings
,
two pointers
2500
x1556
1452D
Radio Towers
combinatorics
,
dp
,
math
1600
x7963
1452C
Two Brackets
greedy
800
x19464
1452B
Toy Blocks
binary search
,
greedy
,
math
,
sortings
1400
x14678
1452A
Robot Program
math
800
x22068
1451F
Nullify The Matrix
constructive algorithms
,
games
2700
x979
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x2956
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x4347
1451D
Circle Game
games
,
geometry
,
math
1700
x9500
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15476
1451B
Non-Substring Subsequence
dp
,
greedy
,
implementation
,
strings
900
x19235
1451A
Subtract or Divide
greedy
,
math
800
x24178
1450H2
Multithreading (Hard Version)
combinatorics
,
implementation
,
math
3300
x217
1450H1
Multithreading (Easy Version)
combinatorics
,
fft
,
math
2900
x433
1450G
Communism
bitmasks
,
dp
,
trees
3500
x311
1450F
The Struggling Contestant
constructive algorithms
,
greedy
2400
x1342
1450E
Capitalism
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2700
x1116
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5468
1450C2
Errich-Tac-Toe (Hard Version)
constructive algorithms
,
math
2300
x3688
1450C1
Errich-Tac-Toe (Easy Version)
constructive algorithms
,
math
2100
x5490
1450B
Balls of Steel
brute force
,
geometry
,
greedy
1000
x15167
1450A
Avoid Trygub
constructive algorithms
,
sortings
800
x17969
1447B
Numbers Box
greedy
,
math
1000
x16472
1447A
Add Candies
constructive algorithms
,
math
800
x13777
1446F
Line Distance
binary search
,
data structures
,
geometry
3200
x331
1446E
Long Recovery
constructive algorithms
,
dfs and similar
3500
x85
1446D2
Frequency Problem (Hard Version)
data structures
,
greedy
,
two pointers
3000
x1298
1446D1
Frequency Problem (Easy Version)
data structures
,
greedy
2600
x1734
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3613
1446B
Catching Cheaters
dp
,
strings
1800
x7819
1446A
Knapsack
constructive algorithms
,
greedy
,
sortings
1300
x15457
1445B
Elimination
greedy
,
math
900
x15256
1445A
Array Rearrangment
greedy
,
sortings
800
x19090
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x137
1444D
Rectangular Polyline
constructive algorithms
,
dp
,
geometry
2900
x567
1444C
Team-Building
data structures
,
dfs and similar
,
dsu
,
graphs
2500
x1592
1444B
Divide and Sum
combinatorics
,
math
,
sortings
1900
x6290
1444A
Division
brute force
,
math
,
number theory
1500
x12992
1443E
Long Permutation
brute force
,
math
,
two pointers
2400
x1249
1443C
The Delivery Dilemma
binary search
,
greedy
,
sortings
1400
x15230
1443B
Saving the City
dp
,
greedy
,
math
,
sortings
1300
x15754
1443A
Kids Seating
constructive algorithms
,
math
800
x16210
1442F
Differentiating Games
games
,
interactive
3400
x131
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x591
1442D
Sum
data structures
,
divide and conquer
,
dp
,
greedy
2800
x2209
1442C
Graph Transpositions
dfs and similar
,
graphs
,
greedy
,
shortest paths
2400
x1685
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x4474
1442A
Extreme Subtraction
constructive algorithms
,
dp
,
greedy
1800
x8846
1440B
Sum of Medians
greedy
,
math
900
x18755
1440A
Buy the String
implementation
,
math
800
x19711
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x221
1439D
INOI Final Contests
combinatorics
,
dp
,
fft
3100
x368
1439C
Greedy Shopping
binary search
,
data structures
,
divide and conquer
,
greedy
,
implementation
2600
x1789
1439B
Graph Subset Problem
constructive algorithms
,
data structures
,
graphs
2600
x1464
1439A2
Binary Table (Hard Version)
constructive algorithms
,
graphs
,
greedy
,
implementation
1900
x5098
1439A1
Binary Table (Easy Version)
constructive algorithms
,
implementation
1500
x9358
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x628
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x1339
1438D
Powerful Ksenia
bitmasks
,
constructive algorithms
,
math
2200
x4173
1438C
Engineer Artem
2-sat
,
chinese remainder theorem
,
constructive algorithms
,
fft
,
flows
2000
x10435
1438B
Valerii Against Everyone
constructive algorithms
,
data structures
,
greedy
,
sortings
1000
x19616
1438A
Specific Tastes of Andre
constructive algorithms
,
implementation
800
x19236
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x999
1437F
Emotional Fishermen
combinatorics
,
dp
,
math
,
two pointers
2600
x1227
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