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Codeforces Round 940 (Div. 2)
3 days
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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
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
274E
Mirror Room
data structures
,
implementation
3000
x298
274D
Lovely Matrix
dfs and similar
,
graphs
,
greedy
,
sortings
2200
x1003
274C
The Last Hole!
brute force
,
geometry
2600
x345
274B
Zero Tree
dfs and similar
,
dp
,
greedy
,
trees
1800
x4879
274A
k-Multiple Free Set
binary search
,
greedy
,
sortings
1500
x9823
273E
Dima and Game
dp
,
games
2600
x357
273D
Dima and Figure
dp
2400
x383
272E
Dima and Horses
combinatorics
,
constructive algorithms
,
graphs
2200
x1169
272D
Dima and Two Sequences
combinatorics
,
math
,
sortings
1600
x2578
272C
Dima and Staircase
data structures
,
implementation
1500
x6664
272B
Dima and Sequence
implementation
,
math
1400
x3910
272A
Dima and Friends
implementation
,
math
1000
x23403
271E
Three Horses
constructive algorithms
,
math
,
number theory
2200
x477
271D
Good Substrings
data structures
,
strings
1800
x10173
271C
Secret
constructive algorithms
,
implementation
1500
x2902
271B
Prime Matrix
binary search
,
brute force
,
math
,
number theory
1300
x12318
271A
Beautiful Year
brute force
800
x126549
270B
Multithreading
data structures
,
greedy
,
implementation
1400
x4068
270A
Fancy Fence
geometry
,
implementation
,
math
1100
x43229
269E
String Theory
geometry
,
math
,
strings
3100
x106
269D
Maximum Waterfall
data structures
,
dp
,
graphs
,
sortings
2600
x412
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1589
269B
Greenhouse Effect
dp
1700
x6097
269A
Magical Boxes
greedy
,
math
1600
x3466
268E
Playlist
math
,
probabilities
,
sortings
2100
x971
268D
Wall Bars
dp
2300
x489
268C
Beautiful Sets of Points
constructive algorithms
,
implementation
1500
x13222
268B
Buttons
implementation
,
math
1000
x30732
268A
Games
brute force
800
x80275
267C
Berland Traffic
math
,
matrices
2700
x156
267B
Dominoes
dfs and similar
,
graphs
2000
x607
267A
Subtractions
math
,
number theory
900
x7067
266E
More Queries to Array...
data structures
,
math
2500
x715
266D
BerDonalds
graphs
,
math
,
shortest paths
2400
x704
266C
Below the Diagonal
constructive algorithms
,
greedy
,
math
2100
x1333
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x125957
266A
Stones on the Table
implementation
800
x176597
265B
Roadside Trees (Simplified Edition)
greedy
,
implementation
1000
x16851
265A
Colorful Stones (Simplified Edition)
implementation
800
x34087
264E
Roadside Trees
data structures
,
dp
3000
x393
264D
Colorful Stones
dp
,
two pointers
2500
x405
264C
Choosing Balls
dp
2000
x2656
264B
Good Sequences
dp
,
number theory
1500
x9574
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x10577
263E
Rhombus
brute force
,
data structures
,
dp
2500
x393
263D
Cycle in Graph
dfs and similar
,
graphs
1800
x3223
263C
Circle of Numbers
brute force
,
dfs and similar
,
implementation
2000
x1050
263B
Squares
greedy
,
implementation
,
sortings
900
x8694
263A
Beautiful Matrix
implementation
800
x222777
262B
Roma and Changing Signs
greedy
1200
x10867
262A
Roma and Lucky Numbers
implementation
800
x18955
261E
Maxim and Calculator
brute force
,
dp
,
two pointers
2800
x402
261D
Maxim and Increasing Subsequence
dp
2600
x552
261C
Maxim and Matrix
constructive algorithms
,
dp
,
math
2000
x758
261B
Maxim and Restaurant
dp
,
math
,
probabilities
1900
x1358
261A
Maxim and Discounts
greedy
,
sortings
1400
x5082
260E
Dividing Kingdom
binary search
,
brute force
,
data structures
2500
x407
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1307
260C
Balls and Boxes
constructive algorithms
,
greedy
,
implementation
1700
x2915
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x3732
260A
Adding Digits
implementation
,
math
1400
x14060
259B
Little Elephant and Magic Square
brute force
,
implementation
1100
x13653
259A
Little Elephant and Chess
brute force
,
strings
1000
x8907
258E
Little Elephant and Tree
data structures
,
dfs and similar
,
trees
2400
x1018
258D
Little Elephant and Broken Sorting
dp
,
math
,
probabilities
2600
x1203
258C
Little Elephant and LCM
binary search
,
combinatorics
,
dp
,
math
2000
x1752
258B
Little Elephant and Elections
brute force
,
combinatorics
,
dp
1900
x1414
258A
Little Elephant and Bits
greedy
,
math
1100
x21968
257E
Greedy Elevator
data structures
,
implementation
2200
x275
257D
Sum
greedy
,
math
1900
x1542
257C
View Angle
brute force
,
geometry
,
math
1800
x4176
257B
Playing Cubes
games
,
greedy
,
implementation
1300
x6844
257A
Sockets
greedy
,
implementation
,
sortings
1100
x6371
256E
Lucky Arrays
data structures
2400
x652
256D
Liars and Serge
dp
2700
x254
255E
Furlo and Rublo and Game
games
,
implementation
,
math
2200
x826
255D
Mr. Bender and Square
binary search
,
implementation
,
math
1800
x1925
255C
Almost Arithmetical Progression
brute force
,
dp
1500
x4615
255B
Code Parsing
implementation
1200
x4855
255A
Greg's Workout
implementation
800
x27561
254E
Dormitory
dp
,
implementation
2100
x482
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x495
254C
Anagram
greedy
,
strings
1800
x1465
254B
Jury Size
brute force
,
implementation
1500
x2125
254A
Cards with Numbers
constructive algorithms
,
sortings
1200
x6817
253E
Printer
binary search
,
data structures
,
implementation
,
sortings
2200
x519
253D
Table with Letters - 2
brute force
,
two pointers
2000
x804
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2514
253B
Physics Practical
binary search
,
dp
,
sortings
,
two pointers
1400
x10265
253A
Boys and Girls
greedy
1100
x10892
252B
Unsorting Array
brute force
,
sortings
1800
x1675
252A
Little Xor
brute force
,
implementation
1100
x5142
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x167
251D
Two Sets
bitmasks
,
math
2700
x440
251C
Number Transformation
dp
,
greedy
,
number theory
2000
x1010
251B
Playing with Permutations
implementation
,
math
1800
x1248
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x16501
250E
Mad Joe
brute force
2000
x437
250D
Building Bridge
geometry
,
ternary search
,
two pointers
1900
x872
250C
Movie Critics
greedy
1600
x1871
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