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Rayan
→ Pay attention
Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
10:49:07
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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
2052M
Managing Cluster
dp
,
graphs
,
math
,
trees
2700
x190
2052L
Legacy Screensaver
2900
x52
2052K
Knowns and Unknowns
2800
x47
2052J
Judicious Watching
binary search
,
greedy
,
sortings
2000
x593
2052I
Incompetent Delivery Guy
graphs
,
shortest paths
2800
x50
2052H
Hunting Hoglins in Hogwarts
interactive
3500
x22
2052G
Geometric Balance
data structures
,
geometry
,
implementation
2800
x89
2052F
Fix Flooded Floor
constructive algorithms
,
dp
,
graphs
1700
x998
2052E
Expression Correction
brute force
,
expression parsing
,
strings
1900
x696
2052D
DAG Serialization
brute force
,
graphs
2100
x496
2052C
Cactus without Bridges
constructive algorithms
,
math
3500
x14
2052B
BitBitJump
2400
x240
2052A
Adrenaline Rush
constructive algorithms
1600
x1212
2051G
Snakes
bitmasks
,
dp
,
graphs
x822
2051F
Joker
brute force
,
greedy
,
implementation
,
math
x1635
2051E
Best Price
brute force
,
data structures
,
greedy
,
sortings
x5401
2051D
Counting Pairs
binary search
,
sortings
,
two pointers
x12592
2051C
Preparing for the Exam
constructive algorithms
,
implementation
x15726
2051B
Journey
binary search
,
math
x22932
2051A
Preparing for the Olympiad
greedy
x22327
2050G
Tree Destruction
dfs and similar
,
dp
,
trees
1900
x2994
2050F
Maximum modulo equality
data structures
,
divide and conquer
,
math
,
number theory
1700
x5528
2050E
Three Strings
dp
,
implementation
,
strings
1500
x8380
2050D
Digital string maximization
brute force
,
greedy
,
math
,
strings
1300
x12111
2050C
Uninteresting Number
brute force
,
dp
,
math
1200
x15865
2050B
Transfusion
brute force
,
greedy
,
math
1100
x18627
2050A
Line Breaks
implementation
800
x26752
2049F
MEX OR Mania
bitmasks
,
brute force
,
data structures
,
dsu
,
implementation
x197
2049E
Broken Queries
binary search
,
brute force
,
constructive algorithms
,
implementation
,
interactive
x751
2049D
Shift + Esc
dp
x3118
2049C
MEX Cycle
brute force
,
constructive algorithms
,
greedy
,
implementation
x8275
2049B
pspspsps
brute force
,
constructive algorithms
,
graph matchings
,
implementation
x12059
2049A
MEX Destruction
greedy
,
implementation
x17480
2048I2
Kevin and Puzzle (Hard Version)
bitmasks
,
fft
,
math
x9
2048I1
Kevin and Puzzle (Easy Version)
constructive algorithms
x35
2048H
Kevin and Strange Operation
data structures
,
dp
x94
2048G
Kevin and Matrices
combinatorics
,
dp
,
math
x313
2048F
Kevin and Math Class
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
,
math
,
trees
x699
2048E
Kevin and Bipartite Graph
constructive algorithms
,
graphs
,
greedy
x2128
2048D
Kevin and Competition Memories
binary search
,
brute force
,
data structures
,
greedy
,
sortings
,
two pointers
x5396
2048C
Kevin and Binary Strings
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
x10352
2048B
Kevin and Permutation
constructive algorithms
,
greedy
x14414
2048A
Kevin and Combination Lock
brute force
,
greedy
,
implementation
,
math
,
number theory
x16921
2047B
Replace Character
brute force
,
combinatorics
,
greedy
,
strings
900
x11960
2047A
Alyona and a Square Jigsaw Puzzle
implementation
,
math
800
x12720
2046F2
Yandex Cuneiform (Hard Version)
constructive algorithms
,
data structures
,
greedy
,
implementation
3500
x30
2046F1
Yandex Cuneiform (Easy Version)
constructive algorithms
,
data structures
,
greedy
3300
x46
2046E2
Cheops and a Contest (Hard Version)
greedy
,
implementation
3500
x28
2046E1
Cheops and a Contest (Easy Version)
constructive algorithms
,
greedy
2900
x112
2046D
For the Emperor!
flows
,
graphs
3100
x204
2046C
Adventurers
binary search
,
data structures
,
greedy
,
sortings
,
ternary search
,
two pointers
2100
x1471
2046B
Move Back at a Cost
binary search
,
data structures
,
greedy
,
sortings
1600
x6494
2046A
Swap Columns and Find a Path
greedy
,
sortings
1200
x10571
2045M
Mirror Maze
brute force
,
dfs and similar
,
graphs
,
implementation
1800
x1042
2045L
Buggy DFS
constructive algorithms
3000
x68
2045K
GCDDCG
2900
x43
2045J
Xorderable Array
bitmasks
,
data structures
2600
x178
2045I
Microwavable Subsequence
data structures
2100
x637
2045H
Missing Separators
dp
,
sortings
,
string suffix structures
,
strings
2200
x403
2045G
X Aura
graphs
,
math
,
shortest paths
2200
x466
2045F
Grid Game 3-angle
games
,
math
3000
x60
2045E
Narrower Passageway
combinatorics
,
data structures
2700
x137
2045D
Aquatic Dragon
3500
x21
2045C
Saraga
greedy
,
strings
1400
x2698
2045B
ICPC Square
math
,
number theory
2000
x792
2045A
Scrambled Scrabble
brute force
,
greedy
1700
x1213
2044H
Hard Demon Problem
constructive algorithms
,
data structures
,
dp
,
implementation
,
math
x1142
2044G2
Medium Demon Problem (hard version)
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
x1700
2044G1
Medium Demon Problem (easy version)
dfs and similar
,
graph matchings
,
graphs
,
implementation
,
trees
x3779
2044F
Easy Demon Problem
binary search
,
brute force
,
data structures
,
math
,
number theory
x3045
2044E
Insane Problem
binary search
,
greedy
,
implementation
,
math
,
number theory
x11059
2044D
Harder Problem
constructive algorithms
,
greedy
,
math
x15738
2044C
Hard Problem
greedy
,
math
x29393
2044B
Normal Problem
implementation
,
strings
x31255
2044A
Easy Problem
brute force
,
math
x33651
2042F
Two Subarrays
data structures
,
dp
,
implementation
,
matrices
2600
x489
2042E
Vertex Pairs
binary search
,
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
greedy
,
implementation
,
trees
2900
x313
2042D
Recommendations
data structures
,
implementation
,
sortings
,
two pointers
1900
x3057
2042C
Competitive Fishing
greedy
1800
x5980
2042B
Game with Colored Marbles
games
,
greedy
900
x13974
2042A
Greedy Monocarp
greedy
,
sortings
800
x16167
2041N
Railway Construction
3300
x20
2041M
Selection Sort
binary search
,
data structures
,
greedy
,
two pointers
2000
x773
2041L
Building Castle
2900
x30
2041K
Trophic Balance Species
binary search
,
brute force
,
dfs and similar
,
graphs
3100
x46
2041J
Bottle Arrangement
data structures
,
divide and conquer
,
dp
,
dsu
,
greedy
2700
x108
2041I
Auto Complete
binary search
,
data structures
,
hashing
,
implementation
,
sortings
,
strings
,
trees
2300
x424
2041H
Sheet Music
combinatorics
,
dp
,
math
2300
x542
2041G
Grid Game
3100
x31
2041F
Segmentation Folds
brute force
,
dfs and similar
,
number theory
2400
x306
2041E
Beautiful Array
constructive algorithms
,
math
1200
x4843
2041D
Drunken Maze
brute force
,
dfs and similar
,
graphs
,
shortest paths
1700
x1558
2041C
Cube
bitmasks
,
dfs and similar
,
dp
2000
x1112
2041B
Bowling Frame
binary search
,
brute force
,
math
1200
x3974
2041A
The Bento Box Adventure
implementation
,
sortings
1300
x6244
2040F
Number of Cubes
combinatorics
,
dp
,
math
,
number theory
2700
x207
2040E
Control of Randomness
combinatorics
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
probabilities
,
trees
2100
x1581
2040D
Non Prime Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
number theory
,
trees
,
two pointers
1900
x3702
2040C
Ordered Permutations
bitmasks
,
combinatorics
,
constructive algorithms
,
greedy
,
math
,
two pointers
1600
x7080
2040B
Paint a Strip
constructive algorithms
,
greedy
,
math
1000
x16460
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