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Educational Codeforces Round 165 (Rated for Div. 2)
29:42:01
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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
380C
Sereja and Brackets
data structures
,
schedules
2000
x13524
2B
The least round way
dp
,
math
2000
x10206
1438C
Engineer Artem
2-sat
,
chinese remainder theorem
,
constructive algorithms
,
fft
,
flows
2000
x10144
1366D
Two Divisors
constructive algorithms
,
math
,
number theory
2000
x9868
1370D
Odd-Even Subsequence
binary search
,
dp
,
dsu
,
greedy
,
implementation
2000
x9113
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x8930
1311D
Three Integers
brute force
,
math
2000
x8632
242E
XOR on Segment
bitmasks
,
data structures
2000
x8382
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x8164
449B
Jzzhu and Cities
graphs
,
greedy
,
shortest paths
2000
x8002
1349B
Orac and Medians
constructive algorithms
,
greedy
,
math
2000
x7692
1244C
The Football Season
brute force
,
math
,
number theory
2000
x7412
1132F
Clear the String
dp
2000
x7250
540C
Ice Cave
dfs and similar
2000
x6991
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6850
1385E
Directing Edges
constructive algorithms
,
dfs and similar
,
graphs
2000
x6784
1288D
Minimax Problem
binary search
,
bitmasks
,
dp
2000
x6665
1363E
Tree Shuffling
dfs and similar
,
dp
,
greedy
,
trees
2000
x6477
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6448
999E
Reachability from the Capital
dfs and similar
,
graphs
,
greedy
2000
x6341
1763C
Another Array Problem
brute force
,
constructive algorithms
,
greedy
2000
x6264
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6196
1674E
Breaking the Wall
binary search
,
brute force
,
constructive algorithms
,
greedy
,
math
2000
x6146
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6118
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x6075
118E
Bertown roads
dfs and similar
,
graphs
2000
x5969
1416B
Make Them Equal
constructive algorithms
,
greedy
,
math
2000
x5897
1156C
Match Points
binary search
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x5883
1354C2
Not So Simple Polygon Embedding
binary search
,
brute force
,
geometry
,
math
2000
x5805
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x5776
1344B
Monopole Magnets
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2000
x5772
1359E
Modular Stability
combinatorics
,
math
,
number theory
2000
x5721
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5672
1268B
Domino for Young
dp
,
greedy
,
math
2000
x5608
1454E
Number of Simple Paths
combinatorics
,
dfs and similar
,
graphs
,
trees
2000
x5499
1427C
The Hard Work of Paparazzi
dp
2000
x5467
478D
Red-Green Towers
dp
2000
x5454
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5399
1294F
Three Paths on a Tree
dfs and similar
,
dp
,
greedy
,
trees
2000
x5338
461B
Appleman and Tree
dfs and similar
,
dp
,
trees
2000
x5313
1415D
XOR-gun
bitmasks
,
brute force
,
constructive algorithms
2000
x5159
895C
Square Subsets
bitmasks
,
combinatorics
,
dp
,
math
2000
x5107
1426F
Number of Subsequences
combinatorics
,
dp
,
strings
2000
x5093
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x5023
938D
Buy a Ticket
data structures
,
graphs
,
shortest paths
2000
x5023
1613E
Crazy Robot
dfs and similar
,
graphs
2000
x4979
1716D
Chip Move
brute force
,
dp
,
math
2000
x4976
710E
Generate a String
dfs and similar
,
dp
2000
x4964
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x4921
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x4862
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x4813
1244E
Minimizing Difference
binary search
,
constructive algorithms
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x4796
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x4780
1296E2
String Coloring (hard version)
data structures
,
dp
2000
x4723
1657D
For Gamers. By Gamers.
binary search
,
brute force
,
greedy
,
math
,
sortings
2000
x4695
1616D
Keep the Average High
dp
,
greedy
,
math
2000
x4690
451D
Count Good Substrings
math
2000
x4637
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4615
466B
Wonder Room
brute force
,
math
2000
x4592
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4580
1536D
Omkar and Medians
data structures
,
greedy
,
implementation
2000
x4551
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x4521
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x4517
1183E
Subsequences (easy version)
dp
,
graphs
,
implementation
,
shortest paths
2000
x4507
598E
Chocolate Bar
brute force
,
dp
2000
x4457
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4455
1493C
K-beautiful Strings
binary search
,
brute force
,
constructive algorithms
,
greedy
,
strings
2000
x4452
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x4446
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4410
1567D
Expression Evaluation Error
constructive algorithms
,
greedy
,
implementation
,
math
2000
x4398
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4392
1481D
AB Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2000
x4384
545E
Paths and Trees
graphs
,
greedy
,
shortest paths
2000
x4377
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4355
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4348
1525C
Robot Collisions
data structures
,
greedy
,
implementation
,
sortings
2000
x4324
1702G2
Passable Paths (hard version)
data structures
,
dfs and similar
,
trees
2000
x4289
1521C
Nastia and a Hidden Permutation
constructive algorithms
,
interactive
2000
x4276
578C
Weakness and Poorness
ternary search
2000
x4265
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4252
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4232
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x4221
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x4220
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x4182
792C
Divide by Three
dp
,
greedy
,
math
,
number theory
2000
x4180
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4163
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4161
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4155
1753C
Wish I Knew How to Sort
dp
,
math
,
probabilities
2000
x4148
864E
Fire
dp
,
sortings
2000
x4124
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4116
1257E
The Contest
data structures
,
dp
,
greedy
2000
x4116
514D
R2D2 and Droid Army
binary search
,
data structures
,
two pointers
2000
x4105
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4091
961D
Pair Of Lines
geometry
2000
x4090
1514D
Cut and Stick
binary search
,
data structures
,
greedy
,
implementation
,
sortings
2000
x4082
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x4052
797E
Array Queries
brute force
,
data structures
,
dp
2000
x4045
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x4032
1620D
Exact Change
brute force
,
constructive algorithms
,
greedy
2000
x4023
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