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Before contest
Codeforces Round 950 (Div. 3)
46:07:03
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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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Custom test
Problems
#
Name
494E
Sharti
data structures
,
games
3200
x309
494D
Birthday
data structures
,
dfs and similar
,
dp
,
trees
2700
x515
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x6690
490F
Treeland Tour
data structures
,
dfs and similar
,
dp
,
trees
2200
x1565
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x2155
487D
Conveyor Belts
data structures
2700
x840
487B
Strip
binary search
,
data structures
,
dp
,
two pointers
2000
x3370
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x2131
484E
Sign on Fence
binary search
,
constructive algorithms
,
data structures
2500
x2175
484D
Kindergarten
data structures
,
dp
,
greedy
2400
x2429
482E
ELCA
data structures
,
trees
3200
x176
482B
Interesting Array
constructive algorithms
,
data structures
,
trees
1800
x6193
480E
Parking Lot
data structures
,
divide and conquer
2800
x515
477E
Dreamoon and Notepad
data structures
3100
x132
475F
Meta-universe
data structures
2900
x227
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x4520
474F
Ant colony
data structures
,
math
,
number theory
2100
x7847
474E
Pillars
binary search
,
data structures
,
dp
,
sortings
,
trees
2000
x3151
472G
Design Tutorial: Increase the Constraints
bitmasks
,
data structures
,
fft
2800
x394
471E
MUH and Lots and Lots of Segments
data structures
,
dsu
2700
x81
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
x34780
464E
The Classic Problem
data structures
,
graphs
,
shortest paths
3000
x1337
461C
Appleman and a Sheet of Paper
data structures
,
implementation
2200
x1311
460C
Present
binary search
,
data structures
,
greedy
1700
x6065
459D
Pashmak and Parmida's problem
data structures
,
divide and conquer
,
sortings
1800
x9590
455E
Function
data structures
2900
x656
455D
Serega and Fun
data structures
2700
x2832
453E
Little Pony and Lord Tirek
data structures
3100
x661
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x1376
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x1040
446C
DZY Loves Fibonacci Numbers
data structures
,
math
,
number theory
2400
x3191
446B
DZY Loves Modification
brute force
,
data structures
,
greedy
2000
x3518
444C
DZY Loves Colors
data structures
2400
x2785
442D
Adam and Tree
data structures
,
trees
2600
x957
442C
Artem and Array
data structures
,
greedy
2500
x1625
438D
The Child and Sequence
data structures
,
math
2300
x7956
436F
Banners
brute force
,
data structures
,
dp
3000
x361
436E
Cardboard Box
data structures
,
greedy
2600
x1267
431E
Chemistry Experiment
binary search
,
data structures
,
ternary search
2200
x907
429D
Tricky Function
data structures
,
divide and conquer
,
geometry
2200
x2609
427B
Prison Transfer
data structures
,
implementation
1100
x13744
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1405
425C
Sereja and Two Sequences
data structures
,
dp
2300
x884
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
x775
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1222
418E
Tricky Password
data structures
3100
x297
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x469
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
x672
407E
k-d-sequence
data structures
3100
x690
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x202
400E
Inna and Binary Logic
binary search
,
bitmasks
,
data structures
2100
x935
398D
Instant Messanger
data structures
x839
396C
On Changing Tree
data structures
,
graphs
,
trees
x1531
392D
Three Arrays
data structures
x211
391D2
Supercollider
data structures
x178
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
x9416
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x6148
383A
Milking cows
data structures
,
greedy
1600
x5216
380E
Sereja and Dividing
data structures
2600
x295
380C
Sereja and Brackets
data structures
,
schedules
2000
x13740
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x2131
377D
Developing Game
data structures
2400
x1093
377B
Preparing for the Contest
binary search
,
data structures
,
greedy
,
sortings
1900
x1977
375D
Tree and Queries
data structures
,
dfs and similar
,
trees
2400
x6270
375B
Maximum Submatrix 2
data structures
,
dp
,
implementation
,
sortings
1600
x4967
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x179
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
x3653
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5373
369E
Valera and Queries
binary search
,
data structures
2200
x2042
368B
Sereja and Suffixes
data structures
,
dp
1100
x39745
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
x193
362D
Fools and Foolproof Roads
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x897
362C
Insertion Sort
data structures
,
dp
,
implementation
,
math
1900
x1658
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x4870
356A
Knight Tournament
data structures
,
dsu
1500
x12864
351D
Jeff and Removing Periods
data structures
2700
x1017
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x257
349B
Color the Fence
data structures
,
dp
,
greedy
,
implementation
1700
x13546
348C
Subset Sums
brute force
,
data structures
2500
x2105
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5515
343B
Alternating Current
data structures
,
greedy
,
implementation
1600
x13134
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x7706
341D
Iahub and Xors
data structures
2500
x1158
340D
Bubble Sort Graph
binary search
,
data structures
,
dp
1500
x7034
339D
Xenia and Bit Operations
data structures
,
trees
1700
x23874
338E
Optimize!
data structures
2600
x952
332C
Students' Revenge
data structures
,
greedy
,
sortings
2200
x891
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