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Codeforces Round 974 (Div. 3)
20:57:23
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→ Filter Problems
Difficulty:
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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
#
Name
894C
Marco and GCD Sequence
constructive algorithms
,
math
1900
x4362
893E
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
2000
x3628
893D
Credit Card
data structures
,
dp
,
greedy
,
implementation
1900
x3033
891B
Gluttony
constructive algorithms
,
greedy
2000
x2980
886D
Restoration of string
constructive algorithms
,
graphs
,
implementation
2000
x1778
883I
Photo Processing
binary search
,
dp
1900
x1956
883G
Orientation of Edges
dfs and similar
,
graphs
1900
x1409
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4448
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x4314
875C
National Property
2-sat
,
dfs and similar
,
graphs
,
implementation
2100
x2116
870D
Something with XOR Queries
brute force
,
interactive
,
probabilities
2000
x1215
865B
Ordering Pizza
binary search
,
sortings
,
ternary search
1900
x1825
864E
Fire
dp
,
sortings
2000
x4231
863E
Turn Off The TV
data structures
,
sortings
2000
x3081
862E
Mahmoud and Ehab and the function
binary search
,
data structures
,
sortings
2100
x1622
862D
Mahmoud and Ehab and the binary string
binary search
,
divide and conquer
,
interactive
2000
x1864
862C
Mahmoud and Ehab and the xor
constructive algorithms
1900
x4052
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1849
859D
Third Month Insanity
dp
,
probabilities
,
trees
2100
x1048
855C
Helga Hufflepuff's Cup
dp
,
trees
2000
x2058
853C
Boredom
data structures
2100
x1480
852E
Casinos and travel
dp
2100
x1042
852D
Exploration plan
binary search
,
flows
,
graph matchings
,
shortest paths
2100
x987
852C
Property
greedy
,
sortings
2100
x577
852B
Neural Network country
dp
,
matrices
2000
x1436
850B
Arpa and a list of numbers
implementation
,
number theory
2100
x2023
848B
Rooter's Song
constructive algorithms
,
data structures
,
geometry
,
implementation
,
sortings
,
two pointers
1900
x1889
847I
Noise Level
dfs and similar
,
implementation
,
math
1900
x1520
847F
Berland Elections
greedy
,
sortings
2100
x860
846D
Monitor
binary search
,
data structures
1900
x2462
843B
Interactive LowerBound
brute force
,
interactive
,
probabilities
2000
x2238
842D
Vitya and Strange Lesson
binary search
,
data structures
2000
x3629
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x3475
840B
Leha and another game about graph
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
graphs
2100
x2465
839B
Game of the Rows
brute force
,
greedy
,
implementation
1900
x3321
838B
Diverging Directions
data structures
,
dfs and similar
,
trees
2100
x782
837E
Vasya's Function
binary search
,
implementation
,
math
2100
x1764
837D
Round Subset
dp
,
math
2100
x5442
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x4104
832D
Misha, Grisha and Underground
dfs and similar
,
graphs
,
trees
1900
x3757
827C
DNA Evolution
data structures
,
strings
2100
x1637
821E
Okabe and El Psy Kongroo
dp
,
matrices
2100
x1459
819B
Mister B and PR Shifts
data structures
,
implementation
,
math
1900
x1696
818F
Level Generation
binary search
,
math
,
ternary search
2100
x1552
818E
Card Game Again
binary search
,
data structures
,
number theory
,
two pointers
1900
x2261
818C
Sofa Thief
brute force
,
implementation
2000
x1241
817E
Choosing The Commander
bitmasks
,
data structures
,
trees
2000
x2884
817D
Imbalanced Array
data structures
,
divide and conquer
,
dsu
,
sortings
1900
x4672
814D
An overnight dance in discotheque
dfs and similar
,
dp
,
geometry
,
greedy
,
trees
2000
x2332
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1762
811C
Vladik and Memorable Trip
dp
,
implementation
1900
x3245
808D
Array Division
binary search
,
data structures
,
implementation
1900
x6973
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x3207
803E
Roma and Poker
dp
,
graphs
2000
x2172
803D
Magazine Ad
binary search
,
greedy
1900
x3242
803C
Maximal GCD
constructive algorithms
,
greedy
,
math
1900
x5088
802K
Send the Fool Further! (medium)
dp
,
trees
2100
x635
802D
Marmots (easy)
math
2100
x452
799D
Field expansion
brute force
,
dp
,
meet-in-the-middle
2100
x2028
797E
Array Queries
brute force
,
data structures
,
dp
2000
x4380
797D
Broken BST
data structures
,
dfs and similar
2100
x1813
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5628
796C
Bank Hacking
constructive algorithms
,
data structures
,
dp
,
trees
1900
x3037
793D
Presents in Bankopolis
dp
,
graphs
,
shortest paths
2100
x1593
792D
Paths in a Complete Binary Tree
bitmasks
,
trees
1900
x3007
792C
Divide by Three
dp
,
greedy
,
math
,
number theory
2000
x4372
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2539
786A
Berzerk
dfs and similar
,
dp
,
games
2000
x2540
784G
BF Calculator
*special problem
2000
x744
784F
Crunching Numbers Just for You
*special problem
,
implementation
1900
x1071
784E
Twisted Circuit
*special problem
,
brute force
,
implementation
2000
x1944
784D
Touchy-Feely Palindromes
*special problem
,
implementation
1900
x457
784B
Kids' Riddle
*special problem
2000
x868
780E
Underground Lab
constructive algorithms
,
dfs and similar
,
graphs
2100
x2553
780D
Innokenty and a Football League
2-sat
,
graphs
,
greedy
,
implementation
,
shortest paths
,
strings
1900
x2895
777E
Hanoi Factory
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x4006
776E
The Holmes Children
math
,
number theory
2100
x2168
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x5046
774L
Bars
*special problem
,
binary search
2000
x336
774J
Stepan's Series
*special problem
,
dp
2000
x360
774B
Significant Cups
*special problem
,
binary search
,
data structures
,
two pointers
2100
x219
774A
Amusement Park
*special problem
,
ternary search
2100
x302
773B
Dynamic Problem Scoring
brute force
,
greedy
2000
x1165
771C
Bear and Tree Jumps
dfs and similar
,
dp
,
trees
2100
x3112
768E
Game of Stones
bitmasks
,
dp
,
games
2100
x2939
767D
Cartons of milk
binary search
,
data structures
,
greedy
,
sortings
,
two pointers
2100
x2228
767C
Garland
dfs and similar
,
graphs
,
greedy
,
trees
2000
x4126
767B
The Queue
brute force
,
greedy
2100
x2121
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x2984
766D
Mahmoud and a Dictionary
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
2000
x3375
763B
Timofey and rectangles
constructive algorithms
,
geometry
2100
x2805
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2477
761E
Dasha and Puzzle
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2000
x2100
758D
Ability To Convert
constructive algorithms
,
dp
,
greedy
,
math
,
strings
2000
x2708
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2333
755D
PolandBall and Polygon
data structures
2000
x2488
754D
Fedor and coupons
binary search
,
data structures
,
greedy
,
sortings
2100
x2457
750D
New Year and Fireworks
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
1900
x3077
749D
Leaving Auction
binary search
,
data structures
2000
x2556
748E
Santa Claus and Tangerines
binary search
,
data structures
,
greedy
,
two pointers
2100
x1465
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