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Rayan
→ Pay attention
Before contest
Codeforces Round (Div. 3)
6 days
→ Filter Problems
Difficulty:
—
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
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Status
Standings
Custom test
Problems
#
Name
1098A
Sum in the tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1600
x8970
1096C
Polygon for the Angle
brute force
,
geometry
1600
x6902
1095D
Circular Dance
implementation
1600
x7667
1085C
Connect Three
implementation
,
math
1600
x5491
1082C
Multi-Subject Competition
greedy
,
sortings
1600
x5871
1082B
Vova and Trophies
greedy
1600
x7734
1077D
Cutting Out
binary search
,
sortings
1600
x9252
1065C
Make It Equal
greedy
1600
x7957
1062C
Banh-mi
greedy
,
implementation
,
math
1600
x5548
1060C
Maximum Subrectangle
binary search
,
implementation
,
two pointers
1600
x4960
1059C
Sequence Transformation
constructive algorithms
,
math
1600
x7240
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x6097
1056B
Divide Candies
math
,
number theory
1600
x4279
1045I
Palindrome Pairs
hashing
,
strings
1600
x4618
1041C
Coffee Break
binary search
,
data structures
,
greedy
,
two pointers
1600
x9619
1036D
Vasya and Arrays
greedy
,
two pointers
1600
x9639
1036B
Diagonal Walking v.2
math
1600
x5746
1033C
Permutation Game
brute force
,
dp
,
games
1600
x5685
1031C
Cram Time
greedy
1600
x5384
1029C
Maximal Intersection
greedy
,
math
,
sortings
1600
x7687
1028C
Rectangles
geometry
,
implementation
,
sortings
1600
x4688
1027C
Minimum Value Rectangle
greedy
1600
x6947
1025C
Plasticine zebra
constructive algorithms
,
implementation
1600
x6207
1025B
Weakened Common Divisor
brute force
,
greedy
,
number theory
1600
x8046
1017C
The Phone Number
constructive algorithms
,
greedy
1600
x6109
1015D
Walking Between Houses
constructive algorithms
,
greedy
1600
x8420
1006E
Military Problem
dfs and similar
,
graphs
,
trees
1600
x10239
1003D
Coins and Queries
greedy
1600
x7938
1002D3
Oracle for majority function
*special problem
1600
x335
1002B3
Distinguish four 2-qubit states
*special problem
1600
x413
1002B2
Distinguish GHZ state and W state
*special problem
1600
x448
1001E
Distinguish Bell states
*special problem
1600
x559
993A
Two Squares
geometry
,
implementation
1600
x4190
992C
Nastya and a Wardrobe
math
1600
x4640
992B
Nastya Studies Informatics
math
,
number theory
1600
x6364
986A
Fair
graphs
,
greedy
,
number theory
,
shortest paths
1600
x7249
980B
Marlin
constructive algorithms
1600
x4772
979C
Kuro and Walking Route
dfs and similar
,
trees
1600
x6570
962D
Merge Equals
data structures
,
implementation
1600
x7005
958E1
Guard Duty (easy)
brute force
,
geometry
,
greedy
,
math
1600
x1563
954D
Fight Against Traffic
dfs and similar
,
graphs
,
shortest paths
1600
x6865
952C
Ravioli Sort
implementation
1600
x2940
949A
Zebras
greedy
1600
x5455
940D
Alena And The Heater
binary search
,
implementation
1600
x3663
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7498
939C
Convenient For Everybody
binary search
,
two pointers
1600
x4675
935C
Fifa and Fafa
geometry
1600
x4831
932C
Permutation Cycle
brute force
,
constructive algorithms
1600
x4071
930B
Game with String
implementation
,
probabilities
,
strings
1600
x2725
926D
Choose Place
1600
x942
925A
Stairs and Elevators
binary search
1600
x3603
924B
Three-level Laser
binary search
,
greedy
,
two pointers
1600
x5390
923B
Producing Snow
binary search
,
data structures
1600
x7407
922C
Cave Painting
brute force
,
number theory
1600
x7259
916C
Jamie and Interesting Graph
constructive algorithms
,
graphs
,
shortest paths
1600
x5203
913C
Party Lemonade
bitmasks
,
dp
,
greedy
1600
x8037
910B
Door Frames
greedy
,
implementation
1600
x1723
906A
Shockers
implementation
,
strings
1600
x4163
898E
Squares and not squares
constructive algorithms
,
greedy
1600
x4689
898D
Alarm Clock
greedy
1600
x4075
888D
Almost Identity Permutations
combinatorics
,
dp
,
math
1600
x8820
878A
Short Program
bitmasks
,
constructive algorithms
1600
x5641
877C
Slava and tanks
constructive algorithms
1600
x5778
873C
Strange Game On Matrix
greedy
,
two pointers
1600
x3346
858D
Polycarp's phone book
data structures
,
implementation
,
sortings
1600
x3946
856A
Set Theory
brute force
,
constructive algorithms
1600
x1470
849B
Tell Your World
brute force
,
geometry
1600
x3755
848A
From Y to Y
constructive algorithms
1600
x5192
847H
Load Testing
greedy
1600
x2472
847B
Preparing for Merge Sort
binary search
,
data structures
1600
x5202
845B
Luba And The Ticket
brute force
,
greedy
,
implementation
1600
x5095
837B
Flag of Berland
brute force
,
implementation
1600
x3972
835C
Star sky
dp
,
implementation
1600
x8106
832B
Petya and Exam
implementation
,
strings
1600
x4403
830B
Cards Sorting
data structures
,
implementation
,
sortings
1600
x2877
825C
Multi-judge Solving
greedy
,
implementation
1600
x4600
825B
Five-In-a-Row
brute force
,
implementation
1600
x4334
822C
Hacker, pack your bags!
binary search
,
greedy
,
implementation
,
sortings
1600
x4638
818B
Permutation Game
implementation
1600
x3051
817C
Really Big Numbers
binary search
,
brute force
,
dp
,
math
1600
x7645
814C
An impassioned circulation of affection
brute force
,
dp
,
strings
,
two pointers
1600
x6838
812B
Sagheer, the Hausmeister
bitmasks
,
brute force
,
dp
1600
x5287
793B
Igor and his way to work
dfs and similar
,
graphs
,
implementation
,
shortest paths
1600
x4530
788A
Functions again
dp
,
two pointers
1600
x9229
785C
Anton and Fairy Tale
binary search
,
math
1600
x7484
780C
Andryusha and Colored Balloons
dfs and similar
,
graphs
,
greedy
,
trees
1600
x9311
780B
The Meeting Place Cannot Be Changed
binary search
1600
x10249
777C
Alyona and Spreadsheet
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
1600
x6506
774K
Stepan and Vowels
*special problem
,
implementation
,
strings
1600
x1290
768B
Code For 1
constructive algorithms
,
dfs and similar
,
divide and conquer
1600
x6109
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x10895
756B
Travel Card
binary search
,
dp
1600
x3875
753B
Interactive Bulls and Cows (Easy)
brute force
,
constructive algorithms
,
implementation
1600
x1256
750C
New Year and Rating
binary search
,
greedy
,
math
1600
x6615
746C
Tram
constructive algorithms
,
implementation
,
math
1600
x3757
741B
Arpa's weak amphitheater and Mehrdad's valuable Hoses
dfs and similar
,
dp
,
dsu
1600
x5362
741A
Arpa's loud Owf and Mehrdad's evil plan
dfs and similar
,
math
1600
x5469
735D
Taxes
math
,
number theory
1600
x14067
735C
Tennis Championship
combinatorics
,
constructive algorithms
,
greedy
,
math
1600
x7605
734C
Anton and Making Potions
binary search
,
dp
,
greedy
,
two pointers
1600
x5423
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