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Codeforces Round 987 (Div. 2)
04:55:48
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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
274A
k-Multiple Free Set
binary search
,
greedy
,
sortings
1500
x10094
273E
Dima and Game
dp
,
games
2600
x366
273D
Dima and Figure
dp
2400
x417
272E
Dima and Horses
combinatorics
,
constructive algorithms
,
graphs
2200
x1230
272D
Dima and Two Sequences
combinatorics
,
math
,
sortings
1600
x2629
272C
Dima and Staircase
data structures
,
implementation
1500
x6802
272B
Dima and Sequence
implementation
,
math
1400
x4034
271E
Three Horses
constructive algorithms
,
math
,
number theory
2200
x505
271D
Good Substrings
data structures
,
strings
1800
x11467
271C
Secret
constructive algorithms
,
implementation
1500
x2998
270B
Multithreading
data structures
,
greedy
,
implementation
1400
x4178
269E
String Theory
geometry
,
math
,
strings
3100
x109
269D
Maximum Waterfall
data structures
,
dp
,
graphs
,
sortings
2600
x450
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1687
269B
Greenhouse Effect
dp
1700
x6342
269A
Magical Boxes
greedy
,
math
1600
x3535
268E
Playlist
math
,
probabilities
,
sortings
2100
x1026
268D
Wall Bars
dp
2300
x510
268C
Beautiful Sets of Points
constructive algorithms
,
implementation
1500
x13693
267C
Berland Traffic
math
,
matrices
2700
x164
267B
Dominoes
dfs and similar
,
graphs
2000
x644
266E
More Queries to Array...
data structures
,
math
2500
x929
266D
BerDonalds
graphs
,
math
,
shortest paths
2400
x899
266C
Below the Diagonal
constructive algorithms
,
greedy
,
math
2100
x1353
264E
Roadside Trees
data structures
,
dp
3000
x436
264D
Colorful Stones
dp
,
two pointers
2500
x422
264C
Choosing Balls
dp
2000
x2954
264B
Good Sequences
dp
,
number theory
1500
x10356
263E
Rhombus
brute force
,
data structures
,
dp
2500
x402
263D
Cycle in Graph
dfs and similar
,
graphs
1800
x3636
263C
Circle of Numbers
brute force
,
dfs and similar
,
implementation
2000
x1078
261E
Maxim and Calculator
brute force
,
dp
,
two pointers
2800
x416
261D
Maxim and Increasing Subsequence
dp
2600
x563
261C
Maxim and Matrix
constructive algorithms
,
dp
,
math
2000
x779
261B
Maxim and Restaurant
dp
,
math
,
probabilities
1900
x1415
261A
Maxim and Discounts
greedy
,
sortings
1400
x5205
260E
Dividing Kingdom
binary search
,
brute force
,
data structures
2500
x457
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1549
260C
Balls and Boxes
constructive algorithms
,
greedy
,
implementation
1700
x2984
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x3823
260A
Adding Digits
implementation
,
math
1400
x14839
258E
Little Elephant and Tree
data structures
,
dfs and similar
,
trees
2400
x1129
258D
Little Elephant and Broken Sorting
dp
,
math
,
probabilities
2600
x1287
258C
Little Elephant and LCM
binary search
,
combinatorics
,
dp
,
math
2000
x1794
258B
Little Elephant and Elections
brute force
,
combinatorics
,
dp
1900
x1453
257E
Greedy Elevator
data structures
,
implementation
2200
x285
257D
Sum
greedy
,
math
1900
x1610
257C
View Angle
brute force
,
geometry
,
math
1800
x4385
256E
Lucky Arrays
data structures
2400
x668
256D
Liars and Serge
dp
2700
x256
255E
Furlo and Rublo and Game
games
,
implementation
,
math
2200
x871
255D
Mr. Bender and Square
binary search
,
implementation
,
math
1800
x2009
255C
Almost Arithmetical Progression
brute force
,
dp
1500
x4730
254E
Dormitory
dp
,
implementation
2100
x676
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x550
254C
Anagram
greedy
,
strings
1800
x1500
254B
Jury Size
brute force
,
implementation
1500
x2159
253E
Printer
binary search
,
data structures
,
implementation
,
sortings
2200
x530
253D
Table with Letters - 2
brute force
,
two pointers
2000
x847
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2613
253B
Physics Practical
binary search
,
dp
,
sortings
,
two pointers
1400
x10802
252B
Unsorting Array
brute force
,
sortings
1800
x1720
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x171
251D
Two Sets
bitmasks
,
math
2700
x476
251C
Number Transformation
dp
,
greedy
,
number theory
2000
x1034
251B
Playing with Permutations
implementation
,
math
1800
x1276
250E
Mad Joe
brute force
2000
x467
250D
Building Bridge
geometry
,
ternary search
,
two pointers
1900
x894
250C
Movie Critics
greedy
1600
x1947
250B
Restoring IPv6
implementation
,
strings
1500
x1993
249E
Endless Matrix
math
2600
x320
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x462
248E
Piglet's Birthday
dp
,
math
,
probabilities
2600
x582
248D
Sweets for Everyone!
binary search
,
greedy
,
implementation
2300
x499
248C
Robo-Footballer
binary search
,
geometry
2000
x855
248B
Chilly Willy
math
,
number theory
1400
x5341
246E
Blood Cousins Return
binary search
,
data structures
,
dfs and similar
,
dp
,
sortings
2400
x3359
246D
Colorful Graph
brute force
,
dfs and similar
,
graphs
1600
x9477
246C
Beauty Pageant
brute force
,
constructive algorithms
,
greedy
1600
x2634
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x6823
245G
Suggested Friends
brute force
,
graphs
2200
x438
245F
Log Stream Analysis
binary search
,
brute force
,
implementation
,
strings
2000
x878
245E
Mishap in Club
greedy
,
implementation
1400
x3295
245D
Restoring Table
constructive algorithms
,
greedy
1500
x2320
245C
Game with Coins
greedy
1700
x1551
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4508
243E
Matrix
data structures
3000
x191
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x214
243C
Colorado Potato Beetle
dfs and similar
,
implementation
2200
x530
243B
Hydra
graphs
,
sortings
2000
x1236
243A
The Brand New Function
bitmasks
1600
x3950
242E
XOR on Segment
bitmasks
,
data structures
2000
x9361
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1881
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8749
241G
Challenging Balloons
constructive algorithms
1900
x548
241F
Race
brute force
,
implementation
2300
x263
241E
Flights
graphs
,
shortest paths
2600
x1111
241D
Numbers
2900
x379
241C
Mirror Box
geometry
,
implementation
2000
x512
241B
Friends
binary search
,
bitmasks
,
data structures
,
math
2700
x814
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