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Before contest
Codeforces Round 946 (Div. 3)
3 days
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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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Status
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Custom test
Problems
#
Name
482B
Interesting Array
constructive algorithms
,
data structures
,
trees
1800
x6172
480E
Parking Lot
data structures
,
divide and conquer
2800
x512
477E
Dreamoon and Notepad
data structures
3100
x131
475F
Meta-universe
data structures
2900
x226
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x4488
474F
Ant colony
data structures
,
math
,
number theory
2100
x7738
474E
Pillars
binary search
,
data structures
,
dp
,
sortings
,
trees
2000
x3126
472G
Design Tutorial: Increase the Constraints
bitmasks
,
data structures
,
fft
2800
x393
471E
MUH and Lots and Lots of Segments
data structures
,
dsu
2700
x80
467E
Alex and Complicated Task
data structures
,
dp
,
greedy
2300
x767
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x34663
464E
The Classic Problem
data structures
,
graphs
,
shortest paths
3000
x1305
461C
Appleman and a Sheet of Paper
data structures
,
implementation
2200
x1310
460C
Present
binary search
,
data structures
,
greedy
1700
x6047
459D
Pashmak and Parmida's problem
data structures
,
divide and conquer
,
sortings
1800
x9530
455E
Function
data structures
2900
x654
455D
Serega and Fun
data structures
2700
x2817
453E
Little Pony and Lord Tirek
data structures
3100
x656
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x1366
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x1039
446C
DZY Loves Fibonacci Numbers
data structures
,
math
,
number theory
2400
x3182
446B
DZY Loves Modification
brute force
,
data structures
,
greedy
2000
x3515
444C
DZY Loves Colors
data structures
2400
x2779
442D
Adam and Tree
data structures
,
trees
2600
x954
442C
Artem and Array
data structures
,
greedy
2500
x1622
438D
The Child and Sequence
data structures
,
math
2300
x7894
436F
Banners
brute force
,
data structures
,
dp
3000
x358
436E
Cardboard Box
data structures
,
greedy
2600
x1255
431E
Chemistry Experiment
binary search
,
data structures
,
ternary search
2200
x902
429D
Tricky Function
data structures
,
divide and conquer
,
geometry
2200
x2581
427B
Prison Transfer
data structures
,
implementation
1100
x13723
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1393
425C
Sereja and Two Sequences
data structures
,
dp
2300
x881
424D
Biathlon Track
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
2300
x557
421D
Bug in Code
binary search
,
data structures
,
sortings
1900
x494
420D
Cup Trick
data structures
2200
x768
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1195
418E
Tricky Password
data structures
3100
x294
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x468
414E
Mashmokh's Designed Problem
data structures
3200
x191
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x673
413E
Maze 2D
data structures
,
divide and conquer
2200
x670
407E
k-d-sequence
data structures
3100
x686
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x201
400E
Inna and Binary Logic
binary search
,
bitmasks
,
data structures
2100
x934
398D
Instant Messanger
data structures
x835
396C
On Changing Tree
data structures
,
graphs
,
trees
x1527
392D
Three Arrays
data structures
x210
391D2
Supercollider
data structures
x177
390C
Inna and Candy Boxes
data structures
x623
387E
George and Cards
binary search
,
data structures
2200
x849
385C
Bear and Prime Numbers
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x9395
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x6122
383A
Milking cows
data structures
,
greedy
1600
x5213
380E
Sereja and Dividing
data structures
2600
x294
380C
Sereja and Brackets
data structures
,
schedules
2000
x13625
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x2118
377D
Developing Game
data structures
2400
x1087
377B
Preparing for the Contest
binary search
,
data structures
,
greedy
,
sortings
1900
x1976
375D
Tree and Queries
data structures
,
dfs and similar
,
trees
2400
x6223
375B
Maximum Submatrix 2
data structures
,
dp
,
implementation
,
sortings
1600
x4959
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x178
374D
Inna and Sequence
binary search
,
data structures
,
dp
,
trees
2000
x844
372D
Choosing Subtree is Fun
binary search
,
data structures
,
dfs and similar
,
trees
,
two pointers
2600
x911
372C
Watching Fireworks is Fun
data structures
,
dp
,
math
2100
x3640
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5344
369E
Valera and Queries
binary search
,
data structures
2200
x2035
368B
Sereja and Suffixes
data structures
,
dp
1100
x39603
367B
Sereja ans Anagrams
binary search
,
data structures
1900
x2410
367A
Sereja and Algorithm
data structures
,
implementation
1500
x4287
366D
Dima and Trap Graph
binary search
,
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
two pointers
2000
x1270
364A
Matrix
combinatorics
,
data structures
,
implementation
1600
x4607
363E
Two Circles
brute force
,
data structures
,
implementation
2500
x192
362D
Fools and Foolproof Roads
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x895
362C
Insertion Sort
data structures
,
dp
,
implementation
,
math
1900
x1655
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x4841
356A
Knight Tournament
data structures
,
dsu
1500
x12805
351D
Jeff and Removing Periods
data structures
2700
x1014
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x256
349B
Color the Fence
data structures
,
dp
,
greedy
,
implementation
1700
x13512
348C
Subset Sums
brute force
,
data structures
2500
x2097
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5493
343B
Alternating Current
data structures
,
greedy
,
implementation
1600
x13063
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x7665
341D
Iahub and Xors
data structures
2500
x1152
340D
Bubble Sort Graph
binary search
,
data structures
,
dp
1500
x7015
339D
Xenia and Bit Operations
data structures
,
trees
1700
x23723
338E
Optimize!
data structures
2600
x947
332C
Students' Revenge
data structures
,
greedy
,
sortings
2200
x885
332B
Maximum Absurdity
data structures
,
dp
,
implementation
1500
x7824
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
x1384
323C
Two permutations
data structures
2400
x570
321E
Ciel and Gondolas
data structures
,
divide and conquer
,
dp
2600
x4534
319E
Ping-Pong
data structures
3000
x632
319B
Psychos in a Line
data structures
,
implementation
1900
x4028
316E3
Summer Homework
data structures
,
math
2300
x504
316E2
Summer Homework
data structures
,
math
2300
x380
316E1
Summer Homework
brute force
,
data structures
1500
x1447
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