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Codeforces Round 974 (Div. 3)
14:01:13
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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
914C
Travelling Salesman and Special Numbers
brute force
,
combinatorics
,
dp
1800
x3734
914B
Conan and Agasa play a Card Game
games
,
greedy
,
implementation
1200
x8602
914A
Perfect Squares
brute force
,
implementation
,
math
900
x14028
913H
Don't Exceed
math
,
probabilities
3400
x124
913G
Power Substring
math
,
number theory
3200
x203
913F
Strongly Connected Tournament
dp
,
graphs
,
math
,
probabilities
2800
x651
913E
Logical Expression
bitmasks
,
dp
,
shortest paths
2400
x770
913D
Too Easy Problems
binary search
,
brute force
,
data structures
,
greedy
,
sortings
1800
x4725
913C
Party Lemonade
bitmasks
,
dp
,
greedy
1600
x7866
913B
Christmas Spruce
implementation
,
trees
1200
x15982
913A
Modular Exponentiation
implementation
,
math
900
x21159
912E
Prime Gift
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
,
two pointers
2400
x1576
912D
Fishes
data structures
,
graphs
,
greedy
,
probabilities
,
shortest paths
2100
x2007
912C
Perun, Ult!
brute force
,
greedy
,
sortings
2500
x517
912B
New Year's Eve
bitmasks
,
constructive algorithms
,
number theory
1300
x11990
912A
Tricky Alchemy
implementation
800
x13454
911G
Mass Change Queries
data structures
2500
x2866
911F
Tree Destruction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x1680
911E
Stack Sorting
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x2526
911D
Inversion Counting
brute force
,
math
1800
x4583
911C
Three Garlands
brute force
,
constructive algorithms
1400
x7022
911B
Two Cakes
binary search
,
brute force
,
implementation
1200
x11342
911A
Nearest Minimums
implementation
1100
x11436
910C
Minimum Sum
constructive algorithms
,
greedy
,
math
1700
x1796
910B
Door Frames
greedy
,
implementation
1600
x1698
910A
The Way to Home
dfs and similar
,
dp
,
greedy
,
implementation
800
x11790
909F
AND-permutations
constructive algorithms
2500
x575
909E
Coprocessor
dfs and similar
,
dp
,
graphs
,
greedy
1900
x2064
909D
Colorful Points
data structures
,
greedy
,
implementation
2100
x1931
909C
Python Indentation
dp
1800
x4886
909B
Segments
constructive algorithms
,
math
1300
x6363
909A
Generate Login
brute force
,
greedy
,
sortings
1000
x9295
908H
New Year and Boolean Bridges
3100
x378
908G
New Year and Original Order
dp
,
math
2800
x1351
908F
New Year and Rainbow Roads
graphs
,
greedy
,
implementation
2400
x1390
908E
New Year and Entity Enumeration
bitmasks
,
combinatorics
,
dp
,
math
2500
x758
908D
New Year and Arbitrary Arrangement
dp
,
math
,
probabilities
2200
x2323
908C
New Year and Curling
brute force
,
geometry
,
implementation
,
math
1500
x6902
908B
New Year and Buggy Bot
brute force
,
implementation
1200
x7638
908A
New Year and Counting Cards
brute force
,
implementation
800
x14788
907B
Tic-Tac-Toe
implementation
1400
x4058
907A
Masha and Bears
brute force
,
implementation
1300
x5684
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x446
906D
Power Tower
chinese remainder theorem
,
math
,
number theory
2700
x2097
906C
Party
bitmasks
,
brute force
,
dp
,
graphs
2400
x1333
906B
Seating of Students
brute force
,
constructive algorithms
,
math
2200
x1136
906A
Shockers
implementation
,
strings
1600
x4119
903G
Yet Another Maxflow Problem
data structures
,
flows
,
graphs
2700
x529
903F
Clear The Matrix
bitmasks
,
dp
2200
x636
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1462
903D
Almost Difference
data structures
,
math
2200
x3771
903C
Boxes Packing
greedy
1200
x17218
903B
The Modcrab
greedy
,
implementation
1200
x7724
903A
Hungry Student Problem
greedy
,
implementation
900
x14563
902B
Coloring a Tree
dfs and similar
,
dsu
,
greedy
1200
x10789
902A
Visiting a Friend
greedy
,
implementation
1100
x9795
901E
Cyclic Cipher
fft
,
math
3300
x86
901D
Weighting a Tree
constructive algorithms
,
dfs and similar
,
graphs
2700
x500
901C
Bipartite Segments
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2300
x1168
901B
GCD of Polynomials
constructive algorithms
,
math
2200
x1580
901A
Hashing Trees
constructive algorithms
,
trees
1500
x5106
900E
Maximum Questions
data structures
,
dp
,
strings
2100
x1233
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x3204
900C
Remove Extra One
brute force
,
data structures
,
math
1700
x4537
900B
Position in Fraction
math
,
number theory
1300
x7809
900A
Find Extra One
geometry
,
implementation
800
x13555
899F
Letters Removing
data structures
,
strings
2100
x1828
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x3020
899D
Shovel Sale
constructive algorithms
,
math
1800
x2749
899C
Dividing the numbers
constructive algorithms
,
graphs
,
math
1300
x8440
899B
Months and Years
implementation
1200
x5863
899A
Splitting in Teams
constructive algorithms
,
greedy
,
math
800
x10179
898F
Restoring the Expression
brute force
,
hashing
,
math
2300
x1187
898E
Squares and not squares
constructive algorithms
,
greedy
1600
x4565
898D
Alarm Clock
greedy
1600
x3889
898C
Phone Numbers
implementation
,
strings
1400
x5265
898B
Proper Nutrition
brute force
,
implementation
,
number theory
1100
x9539
898A
Rounding
implementation
,
math
800
x16027
897B
Chtholly's request
brute force
1300
x7154
897A
Scarborough Fair
implementation
800
x14148
896E
Welcome home, Chtholly
data structures
,
dsu
3100
x2125
896D
Nephren Runs a Cinema
chinese remainder theorem
,
combinatorics
,
math
,
number theory
2900
x529
896C
Willem, Chtholly and Seniorious
data structures
,
probabilities
2600
x3394
896B
Ithea Plays With Chtholly
binary search
,
constructive algorithms
,
games
,
greedy
,
interactive
2000
x2113
896A
Nephren gives a riddle
binary search
,
dfs and similar
1700
x3445
895E
Eyes Closed
data structures
,
probabilities
2300
x1105
895D
String Mark
combinatorics
,
math
,
strings
2100
x1107
895C
Square Subsets
bitmasks
,
combinatorics
,
dp
,
math
2000
x5465
895B
XK Segments
binary search
,
math
,
sortings
,
two pointers
1700
x3469
895A
Pizza Separation
brute force
,
implementation
1200
x6524
894E
Ralph and Mushrooms
dp
,
graphs
2100
x2305
894D
Ralph And His Tour in Binary Country
brute force
,
data structures
,
trees
2200
x1128
894C
Marco and GCD Sequence
constructive algorithms
,
math
1900
x4362
894B
Ralph And His Magic Field
combinatorics
,
constructive algorithms
,
math
,
number theory
1800
x4461
894A
QAQ
brute force
,
dp
800
x34108
893F
Subtree Minimum Query
data structures
,
trees
2300
x1981
893E
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
2000
x3629
893D
Credit Card
data structures
,
dp
,
greedy
,
implementation
1900
x3033
893C
Rumor
dfs and similar
,
graphs
,
greedy
1300
x22884
893B
Beautiful Divisors
brute force
,
implementation
1000
x11318
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