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Before contest
Educational Codeforces Round 166 (Rated for Div. 2)
34:28:07
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Difficulty:
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data structures
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
487D
Conveyor Belts
data structures
2700
x840
487B
Strip
binary search
,
data structures
,
dp
,
two pointers
2000
x3369
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x2080
484E
Sign on Fence
binary search
,
constructive algorithms
,
data structures
2500
x2174
484D
Kindergarten
data structures
,
dp
,
greedy
2400
x2427
482E
ELCA
data structures
,
trees
3200
x175
482B
Interesting Array
constructive algorithms
,
data structures
,
trees
1800
x6189
480E
Parking Lot
data structures
,
divide and conquer
2800
x515
477E
Dreamoon and Notepad
data structures
3100
x131
475F
Meta-universe
data structures
2900
x226
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x4508
474F
Ant colony
data structures
,
math
,
number theory
2100
x7797
474E
Pillars
binary search
,
data structures
,
dp
,
sortings
,
trees
2000
x3150
472G
Design Tutorial: Increase the Constraints
bitmasks
,
data structures
,
fft
2800
x394
471E
MUH and Lots and Lots of Segments
data structures
,
dsu
2700
x80
467E
Alex and Complicated Task
data structures
,
dp
,
greedy
2300
x768
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x34751
464E
The Classic Problem
data structures
,
graphs
,
shortest paths
3000
x1320
461C
Appleman and a Sheet of Paper
data structures
,
implementation
2200
x1310
460C
Present
binary search
,
data structures
,
greedy
1700
x6064
459D
Pashmak and Parmida's problem
data structures
,
divide and conquer
,
sortings
1800
x9569
455E
Function
data structures
2900
x655
455D
Serega and Fun
data structures
2700
x2830
453E
Little Pony and Lord Tirek
data structures
3100
x659
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x1375
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x1040
446C
DZY Loves Fibonacci Numbers
data structures
,
math
,
number theory
2400
x3189
446B
DZY Loves Modification
brute force
,
data structures
,
greedy
2000
x3517
444C
DZY Loves Colors
data structures
2400
x2783
442D
Adam and Tree
data structures
,
trees
2600
x957
442C
Artem and Array
data structures
,
greedy
2500
x1624
438D
The Child and Sequence
data structures
,
math
2300
x7933
436F
Banners
brute force
,
data structures
,
dp
3000
x359
436E
Cardboard Box
data structures
,
greedy
2600
x1262
431E
Chemistry Experiment
binary search
,
data structures
,
ternary search
2200
x905
429D
Tricky Function
data structures
,
divide and conquer
,
geometry
2200
x2605
427B
Prison Transfer
data structures
,
implementation
1100
x13742
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1403
425C
Sereja and Two Sequences
data structures
,
dp
2300
x883
424D
Biathlon Track
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
2300
x558
421D
Bug in Code
binary search
,
data structures
,
sortings
1900
x501
420D
Cup Trick
data structures
2200
x774
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1222
418E
Tricky Password
data structures
3100
x296
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x468
414E
Mashmokh's Designed Problem
data structures
3200
x192
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x675
413E
Maze 2D
data structures
,
divide and conquer
2200
x671
407E
k-d-sequence
data structures
3100
x690
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x201
400E
Inna and Binary Logic
binary search
,
bitmasks
,
data structures
2100
x935
398D
Instant Messanger
data structures
x837
396C
On Changing Tree
data structures
,
graphs
,
trees
x1531
392D
Three Arrays
data structures
x210
391D2
Supercollider
data structures
x177
390C
Inna and Candy Boxes
data structures
x624
387E
George and Cards
binary search
,
data structures
2200
x853
385C
Bear and Prime Numbers
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x9411
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x6140
383A
Milking cows
data structures
,
greedy
1600
x5216
380E
Sereja and Dividing
data structures
2600
x294
380C
Sereja and Brackets
data structures
,
schedules
2000
x13711
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x2127
377D
Developing Game
data structures
2400
x1092
377B
Preparing for the Contest
binary search
,
data structures
,
greedy
,
sortings
1900
x1977
375D
Tree and Queries
data structures
,
dfs and similar
,
trees
2400
x6265
375B
Maximum Submatrix 2
data structures
,
dp
,
implementation
,
sortings
1600
x4966
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x178
374D
Inna and Sequence
binary search
,
data structures
,
dp
,
trees
2000
x845
372D
Choosing Subtree is Fun
binary search
,
data structures
,
dfs and similar
,
trees
,
two pointers
2600
x915
372C
Watching Fireworks is Fun
data structures
,
dp
,
math
2100
x3652
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5367
369E
Valera and Queries
binary search
,
data structures
2200
x2042
368B
Sereja and Suffixes
data structures
,
dp
1100
x39714
367B
Sereja ans Anagrams
binary search
,
data structures
1900
x2414
367A
Sereja and Algorithm
data structures
,
implementation
1500
x4290
366D
Dima and Trap Graph
binary search
,
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
two pointers
2000
x1271
364A
Matrix
combinatorics
,
data structures
,
implementation
1600
x4615
363E
Two Circles
brute force
,
data structures
,
implementation
2500
x192
362D
Fools and Foolproof Roads
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x897
362C
Insertion Sort
data structures
,
dp
,
implementation
,
math
1900
x1657
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x4867
356A
Knight Tournament
data structures
,
dsu
1500
x12840
351D
Jeff and Removing Periods
data structures
2700
x1015
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x256
349B
Color the Fence
data structures
,
dp
,
greedy
,
implementation
1700
x13541
348C
Subset Sums
brute force
,
data structures
2500
x2105
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5508
343B
Alternating Current
data structures
,
greedy
,
implementation
1600
x13119
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x7697
341D
Iahub and Xors
data structures
2500
x1157
340D
Bubble Sort Graph
binary search
,
data structures
,
dp
1500
x7031
339D
Xenia and Bit Operations
data structures
,
trees
1700
x23821
338E
Optimize!
data structures
2600
x949
332C
Students' Revenge
data structures
,
greedy
,
sortings
2200
x887
332B
Maximum Absurdity
data structures
,
dp
,
implementation
1500
x7839
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x170
331B2
Shave Beaver!
data structures
1900
x672
331A2
Oh Sweet Beaverette
data structures
,
sortings
1500
x1386
323C
Two permutations
data structures
2400
x572
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