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Educational Codeforces Round 166 (Rated for Div. 2)
30:01:33
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Difficulty:
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graphs
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
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x2995
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x713
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x6094
1804F
Approximate Diameter
binary search
,
divide and conquer
,
graphs
,
shortest paths
2700
x857
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1373
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2070
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12152
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12219
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x16995
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x658
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x375
1792F1
Graph Coloring (easy version)
combinatorics
,
dp
,
graphs
2700
x676
1790G
Tokens on Graph
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2300
x1073
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3168
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x800
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3284
1783F
Double Sort II
dfs and similar
,
flows
,
graph matchings
,
graphs
2500
x972
1779G
The Game of the Century
constructive algorithms
,
graphs
,
shortest paths
3000
x304
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1706
1778F
Maximizing Root
dfs and similar
,
dp
,
graphs
,
math
,
number theory
,
trees
2600
x601
1777E
Edge Reverse
binary search
,
dfs and similar
,
graphs
,
trees
2200
x1706
1776J
Italian Data Centers
graphs
,
shortest paths
2500
x611
1776F
Train Splitting
constructive algorithms
,
graphs
,
greedy
1700
x3268
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x5825
1772F
Copy of a Copy of a Copy
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
sortings
2000
x2243
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3687
1768D
Lucky Permutation
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1800
x6748
1767E
Algebra Flash
bitmasks
,
brute force
,
dp
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x846
1765H
Hospital Queue
binary search
,
graphs
,
greedy
,
implementation
2200
x1196
1764C
Doremy's City Construction
graphs
,
greedy
1400
x9085
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x420
1763E
Node Pairs
dp
,
graphs
,
math
,
number theory
2200
x1706
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1744
1761C
Set Construction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1400
x9207
1760G
SlavicG's Favorite Problem
bitmasks
,
dfs and similar
,
graphs
1700
x6969
1758E
Tick, Tock
combinatorics
,
dfs and similar
,
dsu
,
graphs
2500
x796
1753D
The Beach
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1682
1749E
Cactus Wall
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1632
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1434
1741D
Masha and a Beautiful Tree
dfs and similar
,
divide and conquer
,
graphs
,
sortings
,
trees
1300
x14568
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x105
1739D
Reset K Edges
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x4903
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1159
1738D
Permutation Addicts
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
1900
x3341
1737D
Ela and the Wiring Wizard
brute force
,
dp
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x1815
1735C
Phase Shift
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
1400
x9614
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3562
1726C
Jatayu's Balanced Bracket Sequence
data structures
,
dsu
,
graphs
,
greedy
1300
x12106
1725M
Moving Both Hands
dp
,
graphs
,
shortest paths
1800
x2879
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x371
1718E
Impressionism
constructive algorithms
,
graphs
,
implementation
,
math
3500
x104
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x515
1715E
Long Way Home
data structures
,
divide and conquer
,
dp
,
geometry
,
graphs
,
greedy
,
shortest paths
2400
x1619
1715D
2+ doors
2-sat
,
bitmasks
,
graphs
,
greedy
1900
x4956
1711B
Party
brute force
,
graphs
1300
x13153
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x537
1707C
DFS Trees
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1401
1704E
Count Seconds
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
2200
x2238
1702E
Split Into Two Sets
dfs and similar
,
dsu
,
graphs
1600
x12476
1698F
Equal Reversal
constructive algorithms
,
graphs
,
implementation
,
math
2800
x586
1697F
Too Many Constraints
2-sat
,
constructive algorithms
,
graphs
,
implementation
2800
x519
1697E
Coloring
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
implementation
,
math
2400
x1145
1696F
Tree Recovery
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x851
1695E
Ambiguous Dominoes
constructive algorithms
,
dfs and similar
,
graphs
2700
x426
1695C
Zero Path
brute force
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x10430
1693C
Keshi in Search of AmShZ
graphs
,
greedy
,
shortest paths
2300
x2454
1691E
Number of Groups
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2300
x1760
1690F
Shifting String
graphs
,
math
,
number theory
,
strings
1700
x6860
1689E
ANDfinity
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1155
1687B
Railway System
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
1700
x3498
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x288
1682E
Unordered Swaps
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
,
trees
2700
x563
1680F
Lenient Vertex Cover
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x632
1679D
Toss a Coin to Your Graph...
binary search
,
dfs and similar
,
dp
,
graphs
1900
x4592
1677C
Tokitsukaze and Two Colorful Tapes
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1900
x3426
1676G
White-Black Balanced Subtrees
dfs and similar
,
dp
,
graphs
,
trees
1300
x14346
1675D
Vertical Paths
graphs
,
implementation
,
trees
1300
x12628
1674G
Remove Directed Edges
dfs and similar
,
dp
,
graphs
2000
x2401
1672G
Cross Xor
constructive algorithms
,
graphs
,
math
,
matrices
3200
x316
1672F2
Checker for Array Shuffling
constructive algorithms
,
dfs and similar
,
graphs
2800
x775
1672F1
Array Shuffling
constructive algorithms
,
graphs
,
greedy
2000
x2982
1670C
Where is the Pizza?
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1400
x9549
1666L
Labyrinth
dfs and similar
,
graphs
1800
x2992
1662O
Circular Maze
brute force
,
dfs and similar
,
graphs
,
implementation
x1276
1662J
Training Camp
flows
,
graphs
x213
1662F
Antennas
data structures
,
dfs and similar
,
graphs
,
graphs
,
implementation
,
implementation
,
shortest paths
,
shortest paths
x971
1662C
European Trip
dp
,
graphs
,
math
,
matrices
x290
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x17084
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x183
1659E
AND-MEX Walk
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2200
x1472
1657F
Words on Tree
2-sat
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x555
1656I
Neighbour Ordering
constructive algorithms
,
graphs
3500
x97
1656G
Cycle Palindrome
constructive algorithms
,
graphs
,
math
3200
x272
1656F
Parametric MST
binary search
,
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
2600
x997
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x358
1654E
Arithmetic Operations
brute force
,
data structures
,
graphs
,
math
2300
x1999
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4855
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2346
1648F
Two Avenues
data structures
,
dfs and similar
,
graphs
3500
x103
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x387
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