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Before contest
Codeforces Round 968 (Div. 2)
34:16:31
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Difficulty:
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dp
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
498E
Stairs and Lines
dp
,
matrices
2700
x459
498D
Traffic Jams in the Land
data structures
,
dp
,
number theory
2400
x1105
498B
Name That Tune
dp
,
probabilities
,
two pointers
2400
x1158
497E
Subsequences Return
dp
,
matrices
2900
x284
494D
Birthday
data structures
,
dfs and similar
,
dp
,
trees
2700
x521
494C
Helping People
dp
,
probabilities
2600
x847
494B
Obsessive String
dp
,
strings
2000
x2646
490F
Treeland Tour
data structures
,
dfs and similar
,
dp
,
trees
2200
x1664
489F
Special Matrices
combinatorics
,
dp
2100
x1656
489E
Hiking
binary search
,
dp
2300
x1020
487B
Strip
binary search
,
data structures
,
dp
,
two pointers
2000
x3467
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x2201
486D
Valid Sets
dfs and similar
,
dp
,
math
,
trees
2100
x3939
484D
Kindergarten
data structures
,
dp
,
greedy
2400
x2566
482D
Random Function and Tree
combinatorics
,
dp
,
trees
2700
x528
482C
Game with Strings
bitmasks
,
dp
,
probabilities
2600
x908
480D
Parcels
dp
,
graphs
2600
x459
479E
Riding in a Lift
combinatorics
,
dp
1900
x5063
478D
Red-Green Towers
dp
2000
x5759
477D
Dreamoon and Binary
dp
,
strings
2700
x520
476E
Dreamoon and Strings
dp
,
strings
2200
x1951
474E
Pillars
binary search
,
data structures
,
dp
,
sortings
,
trees
2000
x3254
468E
Permanent
dp
,
graph matchings
,
math
,
meet-in-the-middle
3100
x312
467E
Alex and Complicated Task
data structures
,
dp
,
greedy
2300
x775
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1812
466D
Increase Sequence
combinatorics
,
dp
2100
x3157
464D
World of Darkraft - 2
dp
,
probabilities
2700
x665
464C
Substitutes in Number
dp
2100
x1846
463D
Gargari and Permutations
dfs and similar
,
dp
,
graphs
,
implementation
1900
x6289
461B
Appleman and Tree
dfs and similar
,
dp
,
trees
2000
x5537
459E
Pashmak and Graph
dp
,
sortings
1900
x5359
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x106
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5669
455B
A Lot of Games
dfs and similar
,
dp
,
games
,
implementation
,
strings
,
trees
1900
x5860
453D
Little Pony and Elements of Harmony
dp
,
matrices
3000
x467
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x4638
449E
Jzzhu and Squares
dp
,
math
,
number theory
2900
x285
449D
Jzzhu and Numbers
bitmasks
,
combinatorics
,
dp
2400
x4334
448C
Painting Fence
divide and conquer
,
dp
,
greedy
1900
x8082
441E
Valera and Number
bitmasks
,
dp
,
math
,
probabilities
2400
x691
440D
Berland Federalization
dp
,
trees
2200
x668
439E
Devu and Birthday Celebration
combinatorics
,
dp
,
math
2100
x1553
437E
The Child and Polygon
dp
,
geometry
2500
x704
436F
Banners
brute force
,
data structures
,
dp
3000
x377
436D
Pudding Monsters
dp
2800
x324
435D
Special Grid
brute force
,
dp
,
greedy
2000
x752
433E
Tachibana Kanade's Tofu
dp
2500
x476
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x8840
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2302
429C
Guess the Tree
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
trees
2300
x936
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x2146
425E
Sereja and Sets
dp
2500
x635
425C
Sereja and Two Sequences
data structures
,
dp
2300
x888
424E
Colored Jenga
dfs and similar
,
dp
,
probabilities
2500
x131
424D
Biathlon Track
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
2300
x560
417D
Cunning Gena
bitmasks
,
dp
,
greedy
,
sortings
1900
x2449
416E
President's Path
dp
,
graphs
,
shortest paths
2500
x1403
413D
2048
bitmasks
,
dp
2000
x792
407D
Largest Submatrix 3
dp
,
hashing
2700
x556
404D
Minesweeper 1D
dp
,
implementation
1900
x2122
403D
Beautiful Pairs of Numbers
combinatorics
,
dp
2300
x1088
402D
Upgrading Array
dp
,
greedy
,
math
,
number theory
1800
x2595
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x4107
386D
Game with Points
dp
,
graphs
,
implementation
,
shortest paths
2100
x425
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x768
385D
Bear and Floodlight
bitmasks
,
dp
,
geometry
2200
x806
383E
Vowels
combinatorics
,
divide and conquer
,
dp
2700
x2989
383D
Antimatter
dp
2300
x2960
382E
Ksenia and Combinatorics
combinatorics
,
dp
2600
x372
379G
New Year Cactus
dp
3100
x141
379D
New Year Letter
bitmasks
,
brute force
,
dp
2000
x1536
377E
Cookie Clicker
dp
,
geometry
2800
x457
377C
Captains Mode
bitmasks
,
dp
,
games
2200
x1128
375E
Red and Black Tree
dp
,
implementation
,
math
3000
x404
374D
Inna and Sequence
binary search
,
data structures
,
dp
,
trees
2000
x859
374C
Inna and Dima
dfs and similar
,
dp
,
graphs
,
implementation
1900
x2723
372C
Watching Fireworks is Fun
data structures
,
dp
,
math
2100
x4039
372B
Counting Rectangles is Fun
brute force
,
divide and conquer
,
dp
1900
x2590
370E
Summer Reading
dp
,
greedy
2500
x286
369D
Valera and Fools
dfs and similar
,
dp
,
graphs
,
shortest paths
2200
x1133
367E
Sereja and Intervals
combinatorics
,
dp
2700
x1113
366C
Dima and Salad
dp
1900
x4726
364B
Free Market
dp
,
greedy
2200
x1170
362C
Insertion Sort
data structures
,
dp
,
implementation
,
math
1900
x1726
360C
Levko and Strings
combinatorics
,
dp
2500
x1100
360B
Levko and Array
binary search
,
dp
2000
x2855
358D
Dima and Hares
dp
,
greedy
1800
x3992
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x408
356D
Bags and Coins
bitmasks
,
constructive algorithms
,
dp
,
greedy
2700
x947
354E
Lucky Number Representation
constructive algorithms
,
dfs and similar
,
dp
2200
x874
354D
Transferring Pyramid
dp
2900
x461
354C
Vasya and Beautiful Arrays
brute force
,
dp
,
number theory
2100
x3037
354B
Game with Strings
bitmasks
,
dp
,
games
2400
x451
353E
Antichain
dp
,
graph matchings
,
greedy
2200
x581
353D
Queue
constructive algorithms
,
dp
2000
x2792
351C
Jeff and Brackets
dp
,
matrices
2500
x545
351B
Jeff and Furik
combinatorics
,
dp
,
probabilities
1900
x2356
351A
Jeff and Rounding
dp
,
greedy
,
implementation
,
math
1800
x2912
348E
Pilgrims
dfs and similar
,
dp
,
trees
2800
x435
348D
Turtles
dp
,
matrices
2500
x1680
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