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Educational Codeforces Round 166 (Rated for Div. 2)
23:49:18
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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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Problems
#
Name
1210G
Mateusz and Escape Room
dp
3500
x156
1210F2
Marek and Matching (hard version)
brute force
,
probabilities
3200
x190
1210F1
Marek and Matching (easy version)
brute force
,
probabilities
3100
x190
1210E
Wojtek and Card Tricks
math
2700
x391
1210D
Konrad and Company Evaluation
graphs
2400
x1432
1210C
Kamil and Making a Stream
math
,
number theory
,
trees
2000
x3209
1210B
Marcin and Training Camp
brute force
,
greedy
1700
x5671
1210A
Anadi and Domino
brute force
,
graphs
1700
x5123
1209H
Moving Walkways
data structures
,
greedy
,
math
3300
x138
1209G2
Into Blocks (hard version)
data structures
3200
x381
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x3015
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x1106
1209E2
Rotate Columns (hard version)
bitmasks
,
dp
,
greedy
,
sortings
2500
x1856
1209E1
Rotate Columns (easy version)
bitmasks
,
brute force
,
dp
,
greedy
,
sortings
2000
x2872
1209D
Cow and Snacks
dfs and similar
,
dsu
,
graphs
1700
x8992
1209C
Paint the Digits
constructive algorithms
,
greedy
,
implementation
1500
x7372
1209B
Koala and Lights
implementation
,
math
,
number theory
1300
x8094
1209A
Paint the Numbers
greedy
,
implementation
,
math
800
x12067
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x143
1208G
Polygons
greedy
,
math
,
number theory
2800
x731
1208F
Bits And Pieces
bitmasks
,
dfs and similar
,
dp
,
greedy
2600
x2122
1208E
Let Them Slide
data structures
,
implementation
2200
x1962
1208D
Restore Permutation
binary search
,
data structures
,
greedy
,
implementation
1900
x4797
1208C
Magic Grid
constructive algorithms
1800
x5928
1208B
Uniqueness
binary search
,
brute force
,
implementation
,
two pointers
1500
x10232
1208A
XORinacci
math
900
x16456
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x971
1207F
Remainder Problem
brute force
,
data structures
,
implementation
2100
x4898
1207E
XOR Guessing
bitmasks
,
interactive
,
math
1900
x5760
1207D
Number Of Permutations
combinatorics
1800
x5931
1207C
Gas Pipeline
dp
,
greedy
1500
x9692
1207B
Square Filling
constructive algorithms
,
greedy
,
implementation
1200
x13085
1207A
There Are Two Types Of Burgers
brute force
,
greedy
,
implementation
,
math
800
x21499
1206B
Make Product Equal One
dp
,
implementation
900
x26240
1206A
Choose Two Numbers
math
,
sortings
800
x23666
1205F
Beauty of a Permutation
constructive algorithms
,
math
3400
x122
1205E
Expected Value Again
combinatorics
,
strings
3100
x271
1205D
Almost All
constructive algorithms
,
trees
2700
x620
1205C
Palindromic Paths
implementation
,
interactive
2400
x1130
1205B
Shortest Cycle
bitmasks
,
brute force
,
graphs
,
shortest paths
1900
x6462
1205A
Almost Equal
constructive algorithms
,
greedy
,
math
1200
x13967
1204E
Natasha, Sasha and the Prefix Sums
combinatorics
,
dp
,
math
,
number theory
2300
x1598
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x2981
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x2861
1204C
Anna, Svyatoslav and Maps
dp
,
graphs
,
greedy
,
shortest paths
1700
x6583
1204B
Mislove Has Lost an Array
greedy
,
math
900
x17306
1204A
BowWow and the Timetable
math
1000
x20155
1203F2
Complete the Projects (hard version)
dp
,
greedy
2300
x2762
1203F1
Complete the Projects (easy version)
greedy
2100
x3408
1203E
Boxers
greedy
,
sortings
1500
x13584
1203D2
Remove the Substring (hard version)
binary search
,
greedy
,
implementation
,
two pointers
1700
x7188
1203D1
Remove the Substring (easy version)
greedy
,
implementation
1600
x8599
1203C
Common Divisors
implementation
,
math
1300
x19824
1203B
Equal Rectangles
greedy
,
math
1200
x15716
1203A
Circle of Students
implementation
1000
x16548
1202F
You Are Given Some Letters...
binary search
,
implementation
,
math
2700
x373
1202E
You Are Given Some Strings...
brute force
,
string suffix structures
,
strings
2400
x1959
1202D
Print a 1337-string...
combinatorics
,
constructive algorithms
,
math
,
strings
1900
x5026
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2487
1202B
You Are Given a Decimal String...
brute force
,
dp
,
shortest paths
1700
x4515
1202A
You Are Given Two Binary Strings...
bitmasks
,
greedy
1100
x9021
1201E2
Knightmare (hard)
graphs
,
interactive
,
shortest paths
3000
x141
1201E1
Knightmare (easy)
graphs
,
interactive
,
shortest paths
2900
x126
1201D
Treasure Hunting
binary search
,
dp
,
greedy
,
implementation
2100
x2298
1201C
Maximum Median
binary search
,
greedy
,
math
,
sortings
1400
x21817
1201B
Zero Array
greedy
,
math
1500
x17930
1201A
Important Exam
implementation
,
strings
900
x15353
1200F
Graph Traveler
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
implementation
,
math
,
number theory
2300
x1049
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x7076
1200D
White Lines
brute force
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4069
1200C
Round Corridor
math
,
number theory
1400
x9738
1200B
Block Adventure
dp
,
greedy
1200
x13785
1200A
Hotelier
brute force
,
data structures
,
implementation
800
x20097
1199B
Water Lily
geometry
,
math
1000
x19828
1199A
City Day
implementation
1000
x14231
1198F
GCD Groups 2
greedy
,
number theory
,
probabilities
2900
x821
1198E
Rectangle Painting 2
flows
,
graph matchings
,
graphs
2500
x1155
1198D
Rectangle Painting 1
dp
2300
x3113
1198C
Matching vs Independent Set
constructive algorithms
,
graphs
,
greedy
,
sortings
2000
x3414
1198B
Welfare State
binary search
,
brute force
,
data structures
,
sortings
1600
x9338
1198A
MP3
sortings
,
two pointers
1600
x8911
1197F
Coloring Game
dp
,
games
,
matrices
2700
x242
1197E
Culture Code
binary search
,
combinatorics
,
data structures
,
dp
,
shortest paths
,
sortings
2300
x1603
1197D
Yet Another Subarray Problem
dp
,
greedy
,
math
1900
x5254
1197C
Array Splitting
greedy
,
sortings
1400
x13694
1197B
Pillars
greedy
,
implementation
1000
x13661
1197A
DIY Wooden Ladder
greedy
,
math
,
sortings
900
x13396
1196F
K-th Path
brute force
,
constructive algorithms
,
shortest paths
,
sortings
2200
x2458
1196E
Connected Component on a Chessboard
constructive algorithms
,
implementation
1800
x3658
1196D2
RGB Substring (hard version)
data structures
,
dp
,
implementation
,
two pointers
1600
x9503
1196D1
RGB Substring (easy version)
implementation
1500
x10361
1196C
Robot Breakout
implementation
1500
x9239
1196B
Odd Sum Segments
constructive algorithms
,
math
1200
x16322
1196A
Three Piles of Candies
brute force
,
constructive algorithms
,
math
800
x27334
1195F
Geometers Anonymous Club
data structures
,
geometry
,
math
,
sortings
2500
x696
1195E
OpenStreetMap
data structures
,
two pointers
2100
x2939
1195D2
Submarine in the Rybinsk Sea (hard edition)
combinatorics
,
math
,
number theory
1800
x4557
1195D1
Submarine in the Rybinsk Sea (easy edition)
combinatorics
,
math
,
number theory
1500
x7783
1195C
Basketball Exercise
dp
1400
x24285
1195B
Sport Mafia
binary search
,
brute force
,
math
1000
x19187
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