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Before contest
Educational Codeforces Round 165 (Rated for Div. 2)
20:16:48
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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
596E
Wilbur and Strings
dfs and similar
,
dp
,
graphs
,
strings
2500
x388
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x387
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x384
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x384
1389G
Directing Edges
dfs and similar
,
dp
,
graphs
,
trees
2800
x380
1214H
Tiles Placement
constructive algorithms
,
dfs and similar
,
trees
2800
x370
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x370
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x365
1036G
Sources and Sinks
bitmasks
,
brute force
,
dfs and similar
2700
x361
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x359
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x358
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x358
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x355
62D
Wormhouse
dfs and similar
,
graphs
2300
x347
843C
Upgrading Tree
constructive algorithms
,
dfs and similar
,
graphs
,
math
,
trees
2600
x346
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x345
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x345
1266F
Almost Same Distance
dfs and similar
,
graphs
2900
x331
325C
Monsters and Diamonds
dfs and similar
,
graphs
,
shortest paths
2600
x331
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x328
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x326
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x326
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x326
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x325
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x319
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x314
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x311
687E
TOF
dfs and similar
,
graphs
2900
x310
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x304
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x303
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x293
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2500
x288
802L
Send the Fool Further! (hard)
dfs and similar
,
dp
,
math
,
trees
2400
x279
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x272
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x270
172E
BHTML+BCSS
*special problem
,
dfs and similar
,
expression parsing
2200
x267
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x259
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x245
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x241
1616G
Just Add an Edge
dfs and similar
,
dp
,
graphs
3500
x236
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x235
869D
The Overdosing Ubiquity
brute force
,
dfs and similar
,
graphs
2800
x235
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x232
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x227
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
x220
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x217
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x208
1510C
Cactus Not Enough
dfs and similar
,
graph matchings
,
graphs
2900
x204
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x204
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x199
1297E
Modernization of Treeland
*special problem
,
dfs and similar
,
trees
x197
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x195
331D1
Escaping on Beaveractor
dfs and similar
,
implementation
2400
x194
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x187
42E
Baldman and the military
dfs and similar
,
graphs
,
trees
2700
x187
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x182
982F
The Meeting Place Cannot Be Changed
dfs and similar
,
graphs
2700
x181
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x180
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x179
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x169
1236F
Alice and the Cactus
dfs and similar
,
graphs
,
math
,
probabilities
3000
x168
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x168
1601F
Two Sorts
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
3400
x167
316F1
Suns and Rays
dfs and similar
,
implementation
2200
x164
316F3
Suns and Rays
constructive algorithms
,
dfs and similar
,
implementation
2200
x163
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x161
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x147
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x137
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x137
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x136
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x130
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x126
424E
Colored Jenga
dfs and similar
,
dp
,
probabilities
2500
x122
1552I
Organizing a Music Festival
dfs and similar
,
math
3400
x121
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x118
1218H
Function Composition
dfs and similar
2900
x108
1089H
Harder Satisfiability
2-sat
,
dfs and similar
,
graphs
3400
x105
1648F
Two Avenues
data structures
,
dfs and similar
,
graphs
3500
x102
1533G
Biome Map
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
x86
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x84
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x84
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
x80
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x78
1446E
Long Recovery
constructive algorithms
,
dfs and similar
3500
x76
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x75
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x74
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x47
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x32
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