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Educational Codeforces Round 166 (Rated for Div. 2)
30:26:49
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Difficulty:
—
dfs and similar
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
1495D
BFS Trees
combinatorics
,
dfs and similar
,
graphs
,
math
,
shortest paths
,
trees
2600
x1196
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x330
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2504
1492E
Almost Fault-Tolerant Database
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
2500
x1166
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2047
1490D
Permutation Transformation
dfs and similar
,
divide and conquer
,
implementation
1200
x18876
1487C
Minimum Ties
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
1500
x13747
1486F
Pairs of Paths
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2600
x627
1485E
Move and Swap
dfs and similar
,
dp
,
greedy
,
trees
2500
x1218
1477D
Nezzar and Hidden Permutations
constructive algorithms
,
dfs and similar
,
graphs
2800
x533
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2255
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x8416
1472G
Moving to the Capital
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x4433
1470D
Strange Housing
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
2200
x3588
1467E
Distinctive Roots in a Tree
data structures
,
dfs and similar
,
dp
,
trees
2500
x1341
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2801
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1462
1454E
Number of Simple Paths
combinatorics
,
dfs and similar
,
graphs
,
trees
2000
x5530
1453E
Dog Snacks
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1978
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x458
1450E
Capitalism
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2700
x1027
1446E
Long Recovery
constructive algorithms
,
dfs and similar
3500
x77
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x132
1444C
Team-Building
data structures
,
dfs and similar
,
dsu
,
graphs
2500
x1463
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x558
1442C
Graph Transpositions
dfs and similar
,
graphs
,
greedy
,
shortest paths
2400
x1582
1436D
Bandit in a City
binary search
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x5873
1433D
Districts Connection
constructive algorithms
,
dfs and similar
1200
x21896
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x632
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x477
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x7786
1407E
Egor in the Republic of Dagestan
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
2500
x1607
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x9865
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x987
1404B
Tree Tag
dfs and similar
,
dp
,
games
,
trees
1900
x7108
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x358
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x198
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x8881
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x790
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2224
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5700
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x322
1394B
Boboniu Walks on Graph
brute force
,
dfs and similar
,
graphs
,
hashing
2300
x1793
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3776
1392G
Omkar and Pies
bitmasks
,
dfs and similar
,
dp
,
math
,
shortest paths
2900
x443
1391E
Pairs of Pairs
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2600
x1442
1389G
Directing Edges
dfs and similar
,
dp
,
graphs
,
trees
2800
x382
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6142
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x9382
1387B2
Village (Maximum)
*special problem
,
dfs and similar
,
trees
2500
x808
1387A
Graph
*special problem
,
binary search
,
dfs and similar
,
dp
,
math
,
ternary search
2100
x673
1385G
Columns Swaps
2-sat
,
dfs and similar
,
dsu
,
graphs
,
implementation
2300
x1330
1385E
Directing Edges
constructive algorithms
,
dfs and similar
,
graphs
2000
x6864
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x451
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5434
1375G
Tree Modification
brute force
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
trees
2800
x1673
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x1250
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1370
1369F
BareLee
dfs and similar
,
dp
,
games
2700
x598
1369E
DeadLee
data structures
,
dfs and similar
,
greedy
,
implementation
,
sortings
2400
x2025
1367E
Necklace Assembly
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
number theory
1900
x5140
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x16246
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x4025
1363E
Tree Shuffling
dfs and similar
,
dp
,
greedy
,
trees
2000
x6506
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x629
1361C
Johnny and Megan's Necklace
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1390
1354E
Graph Coloring
dfs and similar
,
dp
,
graphs
2100
x3068
1352F
Binary String Reconstruction
constructive algorithms
,
dfs and similar
,
math
1500
x16349
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x4243
1348F
Phoenix and Memory
data structures
,
dfs and similar
,
graphs
,
greedy
2600
x778
1344C
Quantifier Question
dfs and similar
,
dp
,
graphs
,
math
2600
x1675
1344B
Monopole Magnets
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2000
x5809
1340D
Nastya and Time Machine
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2600
x849
1340C
Nastya and Unexpected Guest
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x2071
1338D
Nested Rubber Bands
constructive algorithms
,
dfs and similar
,
dp
,
math
,
trees
2700
x860
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x8137
1336A
Linova and Kingdom
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1600
x19481
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x2009
1332F
Independent Set
dfs and similar
,
dp
,
trees
2500
x978
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x15743
1331E
Jordan Smiley
*special problem
,
dfs and similar
,
geometry
,
implementation
x1202
1328E
Tree Queries
dfs and similar
,
graphs
,
trees
1900
x8882
1327D
Infinite Path
brute force
,
dfs and similar
,
graphs
,
math
,
number theory
2200
x3080
1325F
Ehab's Last Theorem
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2500
x1739
1325E
Ehab's REAL Number Theory Problem
brute force
,
dfs and similar
,
graphs
,
number theory
,
shortest paths
2600
x1856
1325C
Ehab and Path-etic MEXs
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1500
x13020
1324F
Maximum White Subtree
dfs and similar
,
dp
,
graphs
,
trees
1800
x9180
1324C
Frog Jumps
binary search
,
data structures
,
dfs and similar
,
greedy
,
implementation
1100
x26996
1320E
Treeland and Viruses
data structures
,
dfs and similar
,
dp
,
shortest paths
,
trees
3000
x671
1320B
Navigation System
dfs and similar
,
graphs
,
shortest paths
1700
x5813
1316D
Nash Matrix
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2000
x3211
1312G
Autocompletion
data structures
,
dfs and similar
,
dp
2600
x796
1311B
WeirdSort
dfs and similar
,
sortings
1200
x18522
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x570
1307D
Cow and Fields
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
sortings
1900
x6042
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x4761
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x4936
1303C
Perfect Keyboard
dfs and similar
,
greedy
,
implementation
1600
x11849
1301F
Super Jaber
dfs and similar
,
graphs
,
implementation
,
shortest paths
2600
x1092
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x421
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