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Before contest
Codeforces Round 941 (Div. 1)
09:18:06
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Before contest
Codeforces Round 941 (Div. 2)
09:18:06
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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
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probabilities
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ternary search
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Problems
#
Name
703D
Mishka and Interesting sum
data structures
2100
x3321
703C
Chris and Road
geometry
,
implementation
2100
x1580
702E
Analysis of Pathes in Functional Graph
data structures
,
graphs
2100
x2262
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x2046
690D3
The Wall (hard)
dp
2100
x489
689E
Mike and Geometry Problem
combinatorics
,
data structures
,
dp
,
geometry
,
implementation
2000
x1806
689D
Friends and Subsequences
binary search
,
data structures
2100
x3055
681D
Gifts by the List
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2000
x1717
676D
Theseus and labyrinth
graphs
,
implementation
,
shortest paths
2000
x1826
675C
Money Transfers
constructive algorithms
,
data structures
,
greedy
,
sortings
2100
x3415
671B
Robin Hood
binary search
,
greedy
2000
x2966
666B
World Tour
graphs
,
shortest paths
2000
x2063
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x2854
662D
International Olympiad
constructive algorithms
,
greedy
,
implementation
,
math
2000
x1616
661E
Divisibility Check
*special problem
2000
x78
661D
Maximal Difference
*special problem
2100
x124
661C
Array Sum
*special problem
2000
x126
659F
Polycarp and Hay
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2000
x1748
656E
Out of Controls
*special problem
2000
x716
656D
Rosetta Problem
*special problem
2100
x938
656C
Without Text
*special problem
2000
x675
649E
Автобус
binary search
,
data structures
,
greedy
,
sortings
2100
x103
644C
Hostname Aliases
*special problem
,
binary search
,
data structures
,
implementation
,
sortings
,
strings
2100
x908
641E
Little Artem and Time Machine
data structures
2000
x2905
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2558
632D
Longest Subsequence
brute force
,
math
,
number theory
2100
x3362
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1983
630P
Area of a Star
geometry
2100
x1056
630O
Arrow
geometry
2000
x722
629D
Babaei and Birthday Cake
data structures
,
dp
2000
x3860
629C
Famil Door and Brackets
dp
,
strings
2000
x2733
621E
Wet Shark and Blocks
dp
,
matrices
2000
x2715
620E
New Year Tree
bitmasks
,
data structures
,
trees
2100
x5165
615E
Hexagons
binary search
,
implementation
,
math
2100
x962
615D
Multipliers
math
,
number theory
2000
x3782
615C
Running Track
dp
,
greedy
,
strings
,
trees
2000
x2251
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2510
609E
Minimum spanning tree for each edge
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x6910
609D
Gadgets for dollars and pounds
binary search
,
greedy
,
two pointers
2000
x2550
601B
Lipshitz Sequence
data structures
,
math
2100
x2001
600D
Area of Two Circles' Intersection
geometry
2000
x2133
598E
Chocolate Bar
brute force
,
dp
2000
x4454
590B
Chip 'n Dale Rescue Rangers
binary search
,
geometry
,
math
2100
x1693
587B
Duff in Beach
dp
2100
x1376
578C
Weakness and Poorness
ternary search
2000
x4264
576C
Points on Plane
constructive algorithms
,
divide and conquer
,
geometry
,
greedy
,
sortings
2100
x3221
576B
Invariance of Tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2100
x1572
575F
Bulbo
dp
,
greedy
2100
x983
571B
Minimization
dp
,
greedy
,
sortings
2000
x2522
571A
Lengthening Sticks
combinatorics
,
implementation
,
math
2100
x2006
557D
Vitaly and Cycle
combinatorics
,
dfs and similar
,
graphs
,
math
2000
x2132
555B
Case of Fugitive
data structures
,
greedy
,
sortings
2000
x3681
552E
Vanya and Brackets
brute force
,
dp
,
expression parsing
,
greedy
,
implementation
,
strings
2100
x1408
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1722
549H
Degenerate Matrix
binary search
,
math
2100
x1785
546E
Soldier and Traveling
flows
,
graphs
,
math
2100
x3439
545E
Paths and Trees
graphs
,
greedy
,
shortest paths
2000
x4376
543B
Destroying Roads
constructive algorithms
,
graphs
,
shortest paths
2100
x3829
542F
Quest
dp
,
greedy
2100
x734
542C
Idempotent functions
constructive algorithms
,
graphs
,
math
2000
x1096
540E
Infinite Inversions
binary search
,
data structures
,
implementation
,
sortings
,
trees
2100
x2005
540C
Ice Cave
dfs and similar
2000
x6986
533B
Work Group
dfs and similar
,
dp
,
graphs
,
strings
,
trees
2000
x2299
530H
Points in triangle
*special problem
,
geometry
2100
x119
530G
Levenshtein distance
*special problem
2100
x146
530F
Jumping frogs
*special problem
2100
x97
526C
Om Nom and Candies
brute force
,
greedy
,
math
2000
x2261
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x2722
524D
Social Network
greedy
,
two pointers
2100
x939
522D
Closest Equals
*special problem
,
data structures
2000
x2940
522C
Chicken or Fish?
greedy
2100
x706
520D
Cubes
games
,
greedy
,
implementation
2100
x1532
519E
A and B and Lecture Rooms
binary search
,
data structures
,
dfs and similar
,
dp
,
trees
2100
x6161
515D
Drazil and Tiles
constructive algorithms
,
greedy
2000
x2759
514D
R2D2 and Droid Army
binary search
,
data structures
,
two pointers
2000
x4105
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6448
513C
Second price auction
bitmasks
,
probabilities
2000
x1516
509E
Pretty Song
math
,
strings
2000
x1768
509C
Sums of Digits
dp
,
greedy
,
implementation
2000
x1997
507E
Breaking Good
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2589
501D
Misha and Permutations Summation
data structures
2000
x2321
498C
Array and Operations
flows
,
graph matchings
,
number theory
2100
x3272
496E
Distributing Parts
greedy
,
sortings
2100
x1624
494B
Obsessive String
dp
,
strings
2000
x2567
492E
Vanya and Field
math
2000
x1585
491B
New York Hotel
greedy
,
math
2100
x535
490E
Restoring Increasing Sequence
binary search
,
brute force
,
greedy
,
implementation
2000
x1516
489F
Special Matrices
combinatorics
,
dp
2100
x1595
487B
Strip
binary search
,
data structures
,
dp
,
two pointers
2000
x3344
486D
Valid Sets
dfs and similar
,
dp
,
math
,
trees
2100
x3850
484B
Maximum Value
binary search
,
math
,
sortings
,
two pointers
2100
x6768
478D
Red-Green Towers
dp
2000
x5451
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x4446
475C
Kamal-ol-molk's Painting
brute force
,
constructive algorithms
,
greedy
2100
x777
474F
Ant colony
data structures
,
math
,
number theory
2100
x7641
474E
Pillars
binary search
,
data structures
,
dp
,
sortings
,
trees
2000
x3092
474C
Captain Marmot
brute force
,
geometry
2000
x3061
468B
Two Sets
2-sat
,
dfs and similar
,
dsu
,
graph matchings
,
greedy
2000
x3792
466E
Information Graph
dfs and similar
,
dsu
,
graphs
,
trees
2100
x2055
466D
Increase Sequence
combinatorics
,
dp
2100
x2831
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