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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
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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
1446E
Long Recovery
constructive algorithms
,
dfs and similar
3500
x74
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x84
1648F
Two Avenues
data structures
,
dfs and similar
,
graphs
3500
x101
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x129
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x134
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x146
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x160
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x161
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x186
1616G
Just Add an Edge
dfs and similar
,
dp
,
graphs
3500
x232
1089H
Harder Satisfiability
2-sat
,
dfs and similar
,
graphs
3400
x104
1552I
Organizing a Music Festival
dfs and similar
,
math
3400
x120
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x133
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x136
1601F
Two Sorts
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
3400
x166
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x181
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x228
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x234
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x355
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x111
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x198
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x258
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x392
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x563
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x269
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x300
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x318
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x361
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x380
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x380
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x583
538H
Summer Dichotomy
2-sat
,
data structures
,
dfs and similar
,
greedy
3200
x601
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x2109
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x168
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x216
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x323
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x393
521E
Cycling City
dfs and similar
,
graphs
3100
x913
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x1010
1236F
Alice and the Cactus
dfs and similar
,
graphs
,
math
,
probabilities
3000
x165
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x167
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x176
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x225
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x324
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x344
1178G
The Awesomest Vertex
data structures
,
dfs and similar
3000
x404
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x409
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x416
1558E
Down Below
binary search
,
dfs and similar
,
graphs
,
greedy
,
meet-in-the-middle
,
shortest paths
3000
x428
1552G
A Serious Referee
bitmasks
,
brute force
,
dfs and similar
,
sortings
3000
x445
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x445
1610F
Mashtali: a Space Oddysey
constructive algorithms
,
dfs and similar
,
graphs
3000
x488
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x505
1534F2
Falling Sand (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
3000
x508
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x549
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x574
1320E
Treeland and Viruses
data structures
,
dfs and similar
,
dp
,
shortest paths
,
trees
3000
x614
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x622
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x632
566C
Logistical Questions
dfs and similar
,
divide and conquer
,
trees
3000
x689
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x856
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x83
1218H
Function Composition
dfs and similar
2900
x107
1510C
Cactus Not Enough
dfs and similar
,
graph matchings
,
graphs
2900
x203
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x203
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x238
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x241
687E
TOF
dfs and similar
,
graphs
2900
x309
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x310
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x324
1266F
Almost Same Distance
dfs and similar
,
graphs
2900
x329
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x351
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x394
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x436
1392G
Omkar and Pies
bitmasks
,
dfs and similar
,
dp
,
math
,
shortest paths
2900
x439
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x540
1062F
Upgrading Cities
dfs and similar
,
graphs
2900
x541
1667D
Edge Elimination
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x631
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x668
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1586
741D
Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths
data structures
,
dfs and similar
,
trees
2900
x2426
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x125
869D
The Overdosing Ubiquity
brute force
,
dfs and similar
,
graphs
2800
x234
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x298
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x344
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x357
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x362
1214H
Tiles Placement
constructive algorithms
,
dfs and similar
,
trees
2800
x368
1389G
Directing Edges
dfs and similar
,
dp
,
graphs
,
trees
2800
x379
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x394
1685D1
Permutation Weight (Easy Version)
constructive algorithms
,
dfs and similar
,
dsu
2800
x417
348E
Pilgrims
dfs and similar
,
dp
,
trees
2800
x425
1749F
Distance to the Path
data structures
,
dfs and similar
,
trees
2800
x466
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x473
1477D
Nezzar and Hidden Permutations
constructive algorithms
,
dfs and similar
,
graphs
2800
x528
51F
Caterpillar
dfs and similar
,
dp
,
graphs
,
trees
2800
x544
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x574
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x576
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x691
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x709
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