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Before contest
Codeforces Round 959 sponsored by NEAR (Div. 1 + Div. 2)
17:55:32
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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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Custom test
Problems
#
Name
292C
Beautiful IP Addresses
brute force
2000
x1021
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1286
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x130
290E
HQ
*special problem
,
constructive algorithms
2500
x198
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1529
288E
Polo the Penguin and Lucky Numbers
dp
,
implementation
,
math
2800
x288
288D
Polo the Penguin and Trees
combinatorics
,
dfs and similar
,
trees
2400
x683
288C
Polo the Penguin and XOR operation
implementation
,
math
1700
x2267
287B
Pipeline
binary search
,
math
1700
x9264
286E
Ladies' Shop
constructive algorithms
,
fft
,
math
2800
x825
286D
Tourists
data structures
,
sortings
2600
x373
286C
Main Sequence
greedy
,
implementation
2100
x1478
286B
Shifting
implementation
2200
x1110
285E
Positions in Permutations
combinatorics
,
dp
,
math
2600
x963
285D
Permutation Sum
bitmasks
,
combinatorics
,
dp
,
implementation
,
meet-in-the-middle
1900
x1512
283E
Cow Tennis Tournament
combinatorics
,
data structures
,
math
2800
x727
283D
Cows and Cool Sequences
dp
,
math
,
number theory
2400
x529
283C
Coin Troubles
dp
2100
x1418
283B
Cow Program
dfs and similar
,
dp
,
graphs
1700
x3626
282E
Sausage Maximization
bitmasks
,
data structures
,
trees
2200
x3505
282D
Yet Another Number Game
dp
,
games
2100
x1395
281B
Nearest Fraction
brute force
,
implementation
,
two pointers
1700
x2951
280E
Sequence Transformation
brute force
,
data structures
,
dp
,
implementation
,
math
3000
x203
280D
k-Maximum Subsequence Sum
data structures
,
flows
,
graphs
,
implementation
2800
x1237
280C
Game on Tree
implementation
,
math
,
probabilities
,
trees
2200
x3724
280B
Maximum Xor Secondary
data structures
,
implementation
,
two pointers
1800
x4479
280A
Rectangle Puzzle
geometry
2000
x1452
279E
Beautiful Decomposition
dp
,
games
,
greedy
,
number theory
1900
x1419
279D
The Minimum Number of Variables
bitmasks
,
dp
2200
x716
279C
Ladder
dp
,
implementation
,
two pointers
1700
x8138
277E
Binary Tree on Plane
flows
,
trees
2400
x1251
277D
Google Code Jam
dp
,
probabilities
2800
x331
277C
Game
games
,
implementation
2400
x448
277B
Set of Points
constructive algorithms
,
geometry
2300
x787
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1572
276D
Little Girl and Maximum XOR
bitmasks
,
dp
,
greedy
,
implementation
,
math
1700
x13397
275B
Convex Shape
constructive algorithms
,
implementation
1700
x2799
274E
Mirror Room
data structures
,
implementation
3000
x306
274D
Lovely Matrix
dfs and similar
,
graphs
,
greedy
,
sortings
2200
x1015
274C
The Last Hole!
brute force
,
geometry
2600
x348
274B
Zero Tree
dfs and similar
,
dp
,
greedy
,
trees
1800
x4935
273E
Dima and Game
dp
,
games
2600
x363
273D
Dima and Figure
dp
2400
x390
272E
Dima and Horses
combinatorics
,
constructive algorithms
,
graphs
2200
x1180
271E
Three Horses
constructive algorithms
,
math
,
number theory
2200
x481
271D
Good Substrings
data structures
,
strings
1800
x10749
269E
String Theory
geometry
,
math
,
strings
3100
x108
269D
Maximum Waterfall
data structures
,
dp
,
graphs
,
sortings
2600
x446
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1626
269B
Greenhouse Effect
dp
1700
x6213
268E
Playlist
math
,
probabilities
,
sortings
2100
x981
268D
Wall Bars
dp
2300
x503
267C
Berland Traffic
math
,
matrices
2700
x160
267B
Dominoes
dfs and similar
,
graphs
2000
x621
266E
More Queries to Array...
data structures
,
math
2500
x771
266D
BerDonalds
graphs
,
math
,
shortest paths
2400
x759
266C
Below the Diagonal
constructive algorithms
,
greedy
,
math
2100
x1340
264E
Roadside Trees
data structures
,
dp
3000
x427
264D
Colorful Stones
dp
,
two pointers
2500
x411
264C
Choosing Balls
dp
2000
x2805
263E
Rhombus
brute force
,
data structures
,
dp
2500
x397
263D
Cycle in Graph
dfs and similar
,
graphs
1800
x3390
263C
Circle of Numbers
brute force
,
dfs and similar
,
implementation
2000
x1063
261E
Maxim and Calculator
brute force
,
dp
,
two pointers
2800
x406
261D
Maxim and Increasing Subsequence
dp
2600
x556
261C
Maxim and Matrix
constructive algorithms
,
dp
,
math
2000
x765
261B
Maxim and Restaurant
dp
,
math
,
probabilities
1900
x1377
260E
Dividing Kingdom
binary search
,
brute force
,
data structures
2500
x453
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1519
260C
Balls and Boxes
constructive algorithms
,
greedy
,
implementation
1700
x2942
258E
Little Elephant and Tree
data structures
,
dfs and similar
,
trees
2400
x1074
258D
Little Elephant and Broken Sorting
dp
,
math
,
probabilities
2600
x1228
258C
Little Elephant and LCM
binary search
,
combinatorics
,
dp
,
math
2000
x1768
258B
Little Elephant and Elections
brute force
,
combinatorics
,
dp
1900
x1429
257E
Greedy Elevator
data structures
,
implementation
2200
x281
257D
Sum
greedy
,
math
1900
x1560
257C
View Angle
brute force
,
geometry
,
math
1800
x4242
256E
Lucky Arrays
data structures
2400
x659
256D
Liars and Serge
dp
2700
x256
255E
Furlo and Rublo and Game
games
,
implementation
,
math
2200
x836
255D
Mr. Bender and Square
binary search
,
implementation
,
math
1800
x1939
254E
Dormitory
dp
,
implementation
2100
x661
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x527
254C
Anagram
greedy
,
strings
1800
x1480
253E
Printer
binary search
,
data structures
,
implementation
,
sortings
2200
x525
253D
Table with Letters - 2
brute force
,
two pointers
2000
x824
252B
Unsorting Array
brute force
,
sortings
1800
x1701
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x169
251D
Two Sets
bitmasks
,
math
2700
x466
251C
Number Transformation
dp
,
greedy
,
number theory
2000
x1013
251B
Playing with Permutations
implementation
,
math
1800
x1260
250E
Mad Joe
brute force
2000
x456
250D
Building Bridge
geometry
,
ternary search
,
two pointers
1900
x882
249E
Endless Matrix
math
2600
x290
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x448
248E
Piglet's Birthday
dp
,
math
,
probabilities
2600
x570
248D
Sweets for Everyone!
binary search
,
greedy
,
implementation
2300
x487
248C
Robo-Footballer
binary search
,
geometry
2000
x804
246E
Blood Cousins Return
binary search
,
data structures
,
dfs and similar
,
dp
,
sortings
2400
x3059
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x6279
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