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Rayan
→ Pay attention
Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
30:42:06
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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
980D
Perfect Groups
dp
,
math
,
number theory
2100
x2741
980C
Posterized
games
,
greedy
1700
x3803
980B
Marlin
constructive algorithms
1600
x4740
980A
Links and Pearls
implementation
,
math
900
x10474
979E
Kuro and Topological Parity
dp
2400
x676
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1877
979C
Kuro and Walking Route
dfs and similar
,
trees
1600
x6382
979B
Treasure Hunt
greedy
1800
x4447
979A
Pizza, Pizza, Pizza!!!
math
1000
x13876
978G
Petya's Exams
greedy
,
implementation
,
sortings
1700
x4419
978F
Mentors
binary search
,
data structures
,
implementation
1500
x8435
978E
Bus Video System
combinatorics
,
math
1400
x9674
978D
Almost Arithmetic Progression
brute force
,
implementation
,
math
1500
x8918
978C
Letters
binary search
,
implementation
,
two pointers
1000
x26151
978B
File Name
greedy
,
strings
800
x36923
978A
Remove Duplicates
implementation
800
x27525
977F
Consecutive Subsequence
dp
1700
x19853
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x21146
977D
Divide by three, multiply by two
dfs and similar
,
math
,
sortings
1400
x18635
977C
Less or Equal
sortings
1200
x35771
977B
Two-gram
implementation
,
strings
900
x40589
977A
Wrong Subtraction
implementation
800
x174579
976F
Minimal k-covering
flows
,
graphs
2500
x594
976E
Well played!
greedy
,
sortings
2100
x2417
976D
Degree Set
constructive algorithms
,
graphs
,
implementation
2500
x692
976C
Nested Segments
greedy
,
implementation
,
sortings
1500
x7110
976B
Lara Croft and the New Game
implementation
,
math
1300
x5739
976A
Minimum Binary Number
implementation
800
x10584
975E
Hag's Khashba
geometry
2600
x311
975D
Ghosts
geometry
,
math
2000
x2229
975C
Valhalla Siege
binary search
1400
x9761
975B
Mancala
brute force
,
implementation
1100
x6882
975A
Aramic script
implementation
,
strings
900
x9377
967B
Watering System
math
,
sortings
1000
x7221
967A
Mind the Gap
implementation
1100
x4385
965E
Short Code
data structures
,
dp
,
greedy
,
strings
,
trees
2200
x1519
965D
Single-use Stones
binary search
,
flows
,
greedy
,
two pointers
1900
x3136
965C
Greedy Arkady
math
2000
x2120
965B
Battleship
implementation
1300
x4583
965A
Paper Airplanes
math
800
x9616
964B
Messages
math
1300
x4381
964A
Splits
math
800
x9738
963E
Circles of Waiting
math
3100
x554
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x2085
963C
Cutting Rectangle
brute force
,
math
,
number theory
2600
x593
963B
Destruction of a Tree
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x2857
963A
Alternating Sum
math
,
number theory
1800
x3371
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x183
962F
Simple Cycles Edges
dfs and similar
,
graphs
,
trees
2400
x1360
962E
Byteland, Berland and Disputed Cities
constructive algorithms
,
greedy
2200
x1095
962D
Merge Equals
data structures
,
implementation
1600
x6954
962C
Make a Square
brute force
,
implementation
,
math
1400
x7928
962B
Students in Railway Carriage
constructive algorithms
,
greedy
,
implementation
1300
x7747
962A
Equator
implementation
1300
x12877
961G
Partitions
combinatorics
,
math
,
number theory
2700
x1370
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x814
961E
Tufurama
data structures
1900
x3704
961D
Pair Of Lines
geometry
2000
x4384
961C
Chessboard
bitmasks
,
brute force
,
implementation
1400
x5328
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x21431
961A
Tetris
implementation
900
x10122
960H
Santa's Gift
data structures
,
trees
3100
x292
960G
Bandit Blues
combinatorics
,
dp
,
fft
,
math
2900
x1079
960F
Pathwalks
data structures
,
dp
,
graphs
2100
x3006
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1968
960D
Full Binary Tree Queries
brute force
,
implementation
,
trees
2100
x1887
960C
Subsequence Counting
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1700
x3938
960B
Minimize the error
data structures
,
greedy
,
sortings
1500
x8286
960A
Check the string
implementation
1200
x8254
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x2166
959E
Mahmoud and Ehab and the xor-MST
bitmasks
,
dp
,
graphs
,
implementation
,
math
1900
x3456
959D
Mahmoud and Ehab and another array construction task
constructive algorithms
,
greedy
,
math
,
number theory
1900
x3108
959C
Mahmoud and Ehab and the wrong algorithm
constructive algorithms
,
trees
1500
x5812
959B
Mahmoud and Ehab and the message
dsu
,
greedy
,
implementation
1200
x9723
959A
Mahmoud and Ehab and the even-odd game
games
,
math
800
x48476
958F3
Lightsabers (hard)
fft
2600
x718
958F2
Lightsabers (medium)
binary search
,
two pointers
1800
x1245
958F1
Lightsabers (easy)
implementation
1500
x1692
958E3
Guard Duty (hard)
geometry
2700
x195
958E2
Guard Duty (medium)
binary search
,
dp
,
greedy
,
sortings
2200
x987
958E1
Guard Duty (easy)
brute force
,
geometry
,
greedy
,
math
1600
x1552
958D2
Hyperspace Jump (hard)
2700
x88
958D1
Hyperspace Jump (easy)
expression parsing
,
math
1400
x2090
958C3
Encryption (hard)
data structures
,
dp
2500
x600
958C2
Encryption (medium)
dp
2000
x1273
958C1
Encryption (easy)
brute force
1200
x2930
958B2
Maximum Control (medium)
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
2200
x681
958B1
Maximum Control (easy)
implementation
1000
x3467
958A3
Death Stars (hard)
3100
x46
958A2
Death Stars (medium)
hashing
,
strings
2000
x931
958A1
Death Stars (easy)
implementation
1400
x1694
957A
Tritonic Iridescence
implementation
1300
x5796
955F
Heaps
dp
,
trees
2600
x384
955E
Icicles
2900
x96
955D
Scissors
brute force
,
strings
2600
x484
955C
Sad powers
binary search
,
math
,
number theory
2100
x2724
955B
Not simply beatiful strings
implementation
1400
x4847
955A
Feed the cat
greedy
,
math
1100
x6698
954I
Yet Another String Matching Problem
fft
,
math
2200
x1062
954H
Path Counting
combinatorics
,
dp
2500
x598
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