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WorldQuant Round 1 (Codeforces Round 1128, Div. 1 + Div. 2)
45:58:28
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2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1970
276D
Little Girl and Maximum XOR
bitmasks
,
dp
,
greedy
,
implementation
,
math
1700
x17152
276C
Little Girl and Maximum Sum
data structures
,
greedy
,
implementation
,
sortings
1500
x44028
276B
Little Girl and Game
games
,
greedy
1300
x33039
276A
Lunch Rush
implementation
900
x30681
275B
Convex Shape
constructive algorithms
,
implementation
1700
x3107
275A
Lights Out
implementation
900
x37632
274E
Mirror Room
data structures
,
implementation
3000
x433
274D
Lovely Matrix
dfs and similar
,
graphs
,
greedy
,
sortings
2200
x1232
274C
The Last Hole!
brute force
,
geometry
2600
x414
274B
Zero Tree
dfs and similar
,
dp
,
greedy
,
trees
1800
x5902
274A
k-Multiple Free Set
binary search
,
greedy
,
sortings
1500
x10942
273E
Dima and Game
dp
,
games
2600
x412
273D
Dima and Figure
dp
2400
x501
272E
Dima and Horses
combinatorics
,
constructive algorithms
,
graphs
2200
x1359
272D
Dima and Two Sequences
combinatorics
,
math
,
sortings
1600
x2888
272C
Dima and Staircase
data structures
,
implementation
1500
x7292
272B
Dima and Sequence
implementation
,
math
1400
x4349
272A
Dima and Friends
implementation
,
math
1000
x28333
271E
Three Horses
constructive algorithms
,
math
,
number theory
2200
x694
271D
Good Substrings
data structures
,
strings
1800
x15013
271C
Secret
constructive algorithms
,
implementation
1500
x3167
271B
Prime Matrix
binary search
,
brute force
,
math
,
number theory
1300
x16053
271A
Beautiful Year
brute force
800
x189434
270B
Multithreading
data structures
,
greedy
,
implementation
1400
x4495
270A
Fancy Fence
geometry
,
implementation
,
math
1100
x52312
269E
String Theory
geometry
,
math
,
strings
3100
x122
269D
Maximum Waterfall
data structures
,
dp
,
graphs
,
sortings
2600
x537
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1965
269B
Greenhouse Effect
dp
1700
x7178
269A
Magical Boxes
greedy
,
math
1600
x3725
268E
Playlist
math
,
probabilities
,
sortings
2100
x1186
268D
Wall Bars
dp
2300
x638
268C
Beautiful Sets of Points
constructive algorithms
,
implementation
1500
x14800
268B
Buttons
implementation
,
math
1000
x36593
268A
Games
brute force
800
x108840
267C
Berland Traffic
math
,
matrices
2700
x297
267B
Dominoes
dfs and similar
,
graphs
2000
x793
267A
Subtractions
math
,
number theory
900
x9896
266E
More Queries to Array...
data structures
,
math
2500
x1194
266D
BerDonalds
graphs
,
math
,
shortest paths
2400
x1044
266C
Below the Diagonal
constructive algorithms
,
greedy
,
math
2100
x1467
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x175028
266A
Stones on the Table
implementation
800
x259968
265B
Roadside Trees (Simplified Edition)
greedy
,
implementation
1000
x18059
265A
Colorful Stones (Simplified Edition)
implementation
800
x44006
264E
Roadside Trees
data structures
,
dp
3000
x488
264D
Colorful Stones
dp
,
two pointers
2500
x455
264C
Choosing Balls
dp
2000
x3515
264B
Good Sequences
dp
,
number theory
1500
x12551
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x11955
263E
Rhombus
brute force
,
data structures
,
dp
2500
x457
263D
Cycle in Graph
dfs and similar
,
graphs
1800
x4666
263C
Circle of Numbers
brute force
,
dfs and similar
,
implementation
2000
x1165
263B
Squares
greedy
,
implementation
,
sortings
900
x9956
263A
Beautiful Matrix
implementation
800
x339357
262B
Roma and Changing Signs
greedy
1200
x12546
262A
Roma and Lucky Numbers
implementation
800
x22758
261E
Maxim and Calculator
brute force
,
dp
,
two pointers
2800
x453
261D
Maxim and Increasing Subsequence
dp
2600
x731
261C
Maxim and Matrix
constructive algorithms
,
dp
,
math
2000
x848
261B
Maxim and Restaurant
dp
,
math
,
probabilities
1900
x1669
261A
Maxim and Discounts
greedy
,
sortings
1400
x5684
260E
Dividing Kingdom
binary search
,
brute force
,
data structures
2500
x551
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1716
260C
Balls and Boxes
constructive algorithms
,
greedy
,
implementation
1700
x3260
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x4113
260A
Adding Digits
implementation
,
math
1400
x16937
259B
Little Elephant and Magic Square
brute force
,
implementation
1100
x14806
259A
Little Elephant and Chess
brute force
,
strings
1000
x10227
258E
Little Elephant and Tree
data structures
,
dfs and similar
,
trees
2400
x1420
258D
Little Elephant and Broken Sorting
dp
,
math
,
probabilities
2600
x1585
258C
Little Elephant and LCM
binary search
,
combinatorics
,
dp
,
math
2000
x2036
258B
Little Elephant and Elections
brute force
,
combinatorics
,
dp
1900
x1645
258A
Little Elephant and Bits
greedy
,
math
1100
x27123
257E
Greedy Elevator
data structures
,
implementation
2200
x376
257D
Sum
greedy
,
math
1900
x1753
257C
View Angle
brute force
,
geometry
,
math
1800
x4815
257B
Playing Cubes
games
,
greedy
,
implementation
1300
x7900
257A
Sockets
greedy
,
implementation
,
sortings
1100
x7020
256E
Lucky Arrays
data structures
2400
x822
256D
Liars and Serge
dp
2700
x300
255E
Furlo and Rublo and Game
games
,
implementation
,
math
2200
x1031
255D
Mr. Bender and Square
binary search
,
implementation
,
math
1800
x2228
255C
Almost Arithmetical Progression
brute force
,
dp
1500
x5127
255B
Code Parsing
implementation
1200
x5554
255A
Greg's Workout
implementation
800
x31647
254E
Dormitory
dp
,
implementation
2100
x738
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x674
254C
Anagram
greedy
,
strings
1800
x1619
254B
Jury Size
brute force
,
implementation
1500
x2284
254A
Cards with Numbers
constructive algorithms
,
sortings
1200
x7893
253E
Printer
binary search
,
data structures
,
implementation
,
sortings
2200
x617
253D
Table with Letters - 2
brute force
,
two pointers
2000
x938
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2968
253B
Physics Practical
binary search
,
dp
,
sortings
,
two pointers
1400
x12606
253A
Boys and Girls
greedy
1100
x12365
252B
Unsorting Array
brute force
,
sortings
1800
x1903
252A
Little Xor
brute force
,
implementation
1100
x5982
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x221
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