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Before contest
Codeforces Round 959 sponsored by NEAR (Div. 1 + Div. 2)
06:04:21
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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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Problems
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Custom test
Problems
#
Name
784B
Kids' Riddle
*special problem
2000
x849
784A
Numbers Joke
*special problem
1700
x3157
780H
Intranet of Buses
binary search
,
geometry
,
implementation
,
two pointers
3100
x118
780G
Andryusha and Nervous Barriers
data structures
,
dp
2700
x652
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x1032
780E
Underground Lab
constructive algorithms
,
dfs and similar
,
graphs
2100
x2524
780D
Innokenty and a Football League
2-sat
,
graphs
,
greedy
,
implementation
,
shortest paths
,
strings
1900
x2853
778E
Selling Numbers
dp
,
sortings
3000
x303
778D
Parquet Re-laying
constructive algorithms
2700
x499
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x872
778B
Bitwise Formula
bitmasks
,
brute force
,
dfs and similar
,
expression parsing
,
implementation
1800
x2285
778A
String Game
binary search
,
greedy
,
strings
1700
x11309
777E
Hanoi Factory
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x3940
777D
Cloud of Hashtags
binary search
,
greedy
,
implementation
,
strings
1800
x4958
776G
Sherlock and the Encrypted Data
bitmasks
,
combinatorics
,
dp
2900
x335
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x426
776E
The Holmes Children
math
,
number theory
2100
x2124
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x4935
776C
Molly's Chemicals
binary search
,
brute force
,
data structures
,
implementation
,
math
1800
x5846
775A
University Schedule
*special problem
2900
774L
Bars
*special problem
,
binary search
2000
x328
774J
Stepan's Series
*special problem
,
dp
2000
x356
774I
Composing Of String
*special problem
,
dp
2300
x101
774H
Repairing Of String
*special problem
,
constructive algorithms
2200
x255
774G
Perfectionist Arkadiy
*special problem
,
number theory
2700
x175
774F
Pens And Days Of Week
*special problem
,
binary search
,
number theory
2700
x105
774E
Big Number and Remainder
*special problem
,
math
,
number theory
2300
x209
774B
Significant Cups
*special problem
,
binary search
,
data structures
,
two pointers
2100
x217
774A
Amusement Park
*special problem
,
ternary search
2100
x297
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x186
773E
Blog Post Rating
data structures
,
sortings
3000
x344
773D
Perishable Roads
dp
,
graphs
,
shortest paths
2700
x583
773C
Prairie Partition
binary search
,
constructive algorithms
,
greedy
,
math
2200
x944
773B
Dynamic Problem Scoring
brute force
,
greedy
2000
x1145
773A
Success Rate
binary search
,
math
1700
x4416
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x125
772D
Varying Kibibits
bitmasks
,
dp
2700
x580
772C
Vulnerable Kerbals
constructive algorithms
,
dp
,
graphs
,
math
,
number theory
2300
x1238
772B
Volatile Kite
geometry
1800
x3151
772A
Voltage Keepsake
binary search
,
math
1800
x4170
771F
Bear and Isomorphic Points
geometry
,
two pointers
3300
x80
771E
Bear and Rectangle Strips
dp
,
greedy
3000
x446
771D
Bear and Company
dp
2500
x1170
771C
Bear and Tree Jumps
dfs and similar
,
dp
,
trees
2100
x2914
769D
k-Interesting Pairs Of Integers
*special problem
,
bitmasks
,
brute force
,
meet-in-the-middle
1700
x2263
769C
Cycle In Maze
*special problem
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1700
x2187
768G
The Winds of Winter
binary search
,
data structures
3300
x355
768F
Barrels and boxes
brute force
,
combinatorics
,
math
,
number theory
,
probabilities
2300
x1008
768E
Game of Stones
bitmasks
,
dp
,
games
2100
x2848
768D
Jon and Orbs
dp
,
math
,
probabilities
2200
x2808
768C
Jon Snow and his Favourite Number
brute force
,
dp
,
implementation
,
sortings
1800
x3778
767E
Change-free
greedy
2400
x958
767D
Cartons of milk
binary search
,
data structures
,
greedy
,
sortings
,
two pointers
2100
x2210
767C
Garland
dfs and similar
,
graphs
,
greedy
,
trees
2000
x4058
767B
The Queue
brute force
,
greedy
2100
x2116
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x2912
766D
Mahmoud and a Dictionary
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
2000
x3317
766C
Mahmoud and a Message
brute force
,
dp
,
greedy
,
strings
1700
x4355
765G
Math, math everywhere
brute force
,
dp
,
math
,
meet-in-the-middle
,
number theory
3200
x84
765F
Souvenirs
data structures
3100
x1944
765E
Tree Folding
dfs and similar
,
dp
,
greedy
,
implementation
,
trees
2200
x1259
765D
Artsem and Saunders
constructive algorithms
,
dsu
,
math
1700
x2457
763E
Timofey and our friends animals
data structures
,
divide and conquer
,
dsu
2900
x483
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x528
763C
Timofey and remoduling
brute force
,
implementation
,
math
,
number theory
2600
x706
763B
Timofey and rectangles
constructive algorithms
,
geometry
2100
x2783
762F
Tree nesting
combinatorics
,
graphs
,
trees
2800
x365
762E
Radio stations
binary search
,
data structures
2200
x1325
762D
Maximum path
dp
,
greedy
,
implementation
2300
x1365
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2406
761F
Dasha and Photos
brute force
,
data structures
,
dp
,
implementation
2600
x408
761E
Dasha and Puzzle
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2000
x1967
761D
Dasha and Very Difficult Problem
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
1700
x3951
758F
Geometrical Progression
brute force
,
math
,
number theory
2400
x623
758E
Broken Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x457
758D
Ability To Convert
constructive algorithms
,
dp
,
greedy
,
math
,
strings
2000
x2694
758C
Unfair Poll
binary search
,
constructive algorithms
,
implementation
,
math
1700
x3843
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x490
757F
Team Rocket Rises Again
data structures
,
graphs
,
shortest paths
2800
x1135
757E
Bash Plays with Functions
brute force
,
combinatorics
,
dp
,
number theory
2500
x1291
757D
Felicity's Big Secret Revealed
bitmasks
,
dp
2200
x1342
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2323
756F
Long number
expression parsing
,
math
,
number theory
3400
x91
756E
Byteland coins
combinatorics
,
dp
,
math
3200
x158
756D
Bacterial Melee
brute force
,
combinatorics
,
dp
,
string suffix structures
2400
x996
756C
Nikita and stack
data structures
2200
x1317
756A
Pavel and barbecue
constructive algorithms
,
dfs and similar
1700
x3004
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x897
755F
PolandBall and Gifts
bitmasks
,
dp
,
greedy
2600
x1301
755E
PolandBall and White-Red graph
constructive algorithms
,
graphs
,
shortest paths
2400
x826
755D
PolandBall and Polygon
data structures
2000
x2483
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x486
754D
Fedor and coupons
binary search
,
data structures
,
greedy
,
sortings
2100
x2427
754C
Vladik and chat
brute force
,
constructive algorithms
,
dp
,
implementation
,
strings
2200
x916
753C
Interactive Bulls and Cows (Hard)
brute force
,
constructive algorithms
,
interactive
2500
x286
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x190
750G
New Year and Binary Tree Paths
bitmasks
,
brute force
,
combinatorics
,
dp
3200
x445
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x479
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x1525
750D
New Year and Fireworks
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
1900
x3069
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