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Before contest
Codeforces Round 968 (Div. 2)
34:16:19
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Difficulty:
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dp
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
#
Name
786A
Berzerk
dfs and similar
,
dp
,
games
2000
x2530
785D
Anton and School - 2
combinatorics
,
dp
,
math
,
number theory
2300
x2914
780G
Andryusha and Nervous Barriers
data structures
,
dp
2700
x656
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x1034
778E
Selling Numbers
dp
,
sortings
3000
x304
777E
Hanoi Factory
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x3979
776G
Sherlock and the Encrypted Data
bitmasks
,
combinatorics
,
dp
2900
x337
774J
Stepan's Series
*special problem
,
dp
2000
x359
774I
Composing Of String
*special problem
,
dp
2300
x101
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x187
773D
Perishable Roads
dp
,
graphs
,
shortest paths
2700
x586
772D
Varying Kibibits
bitmasks
,
dp
2700
x584
772C
Vulnerable Kerbals
constructive algorithms
,
dp
,
graphs
,
math
,
number theory
2300
x1373
771E
Bear and Rectangle Strips
dp
,
greedy
3000
x448
771D
Bear and Company
dp
2500
x1310
771C
Bear and Tree Jumps
dfs and similar
,
dp
,
trees
2100
x3090
768E
Game of Stones
bitmasks
,
dp
,
games
2100
x2903
768D
Jon and Orbs
dp
,
math
,
probabilities
2200
x2895
768C
Jon Snow and his Favourite Number
brute force
,
dp
,
implementation
,
sortings
1800
x3785
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x2959
766D
Mahmoud and a Dictionary
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
2000
x3352
765G
Math, math everywhere
brute force
,
dp
,
math
,
meet-in-the-middle
,
number theory
3200
x85
765E
Tree Folding
dfs and similar
,
dp
,
greedy
,
implementation
,
trees
2200
x1268
762D
Maximum path
dp
,
greedy
,
implementation
2300
x1541
761F
Dasha and Photos
brute force
,
data structures
,
dp
,
implementation
2600
x410
758E
Broken Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x475
758D
Ability To Convert
constructive algorithms
,
dp
,
greedy
,
math
,
strings
2000
x2704
757E
Bash Plays with Functions
brute force
,
combinatorics
,
dp
,
number theory
2500
x1303
757D
Felicity's Big Secret Revealed
bitmasks
,
dp
2200
x1394
756E
Byteland coins
combinatorics
,
dp
,
math
3200
x161
756D
Bacterial Melee
brute force
,
combinatorics
,
dp
,
string suffix structures
2400
x998
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x905
755F
PolandBall and Gifts
bitmasks
,
dp
,
greedy
2600
x1325
754C
Vladik and chat
brute force
,
constructive algorithms
,
dp
,
implementation
,
strings
2200
x921
750G
New Year and Binary Tree Paths
bitmasks
,
brute force
,
combinatorics
,
dp
3200
x446
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x1548
750D
New Year and Fireworks
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
1900
x3074
747F
Igor and Interesting Numbers
brute force
,
combinatorics
,
dp
,
math
2500
x416
747D
Winter Is Coming
dp
,
greedy
,
sortings
1800
x3229
744C
Hongcow Buys a Deck of Cards
bitmasks
,
brute force
,
dp
2400
x1077
743E
Vladik and cards
binary search
,
bitmasks
,
brute force
,
dp
2200
x1491
743D
Chloe and pleasant prizes
dfs and similar
,
dp
,
graphs
,
trees
1800
x4293
739E
Gosha is hunting
brute force
,
data structures
,
dp
,
flows
,
math
,
probabilities
,
sortings
3000
x2136
735E
Ostap and Tree
dp
,
trees
2500
x857
734E
Anton and Tree
dfs and similar
,
dp
,
trees
2100
x4114
733C
Epidemic in Monstropolis
constructive algorithms
,
dp
,
greedy
,
two pointers
1800
x3335
731E
Funny Game
dp
,
games
2200
x1644
730J
Bottles
dp
1900
x3322
730I
Olympiad in Programming and Sports
dp
,
flows
,
graphs
,
greedy
2000
x2017
729F
Financiers Game
dp
2500
x942
727F
Polycarp's problems
binary search
,
dp
,
greedy
2300
x787
724F
Uniformly Branched Trees
combinatorics
,
dp
,
trees
2700
x397
724E
Goods transportation
dp
,
flows
,
greedy
2900
x1287
722E
Research Rover
combinatorics
,
dp
2900
x858
721E
Road to Home
binary search
,
dp
2700
x303
721C
Journey
dp
,
graphs
1800
x5828
720D
Slalom
data structures
,
dp
,
sortings
3100
x229
718D
Andrew and Chemistry
dp
,
hashing
,
trees
2900
x393
717B
R3D3’s Summer Adventure
dp
,
greedy
2700
x145
713E
Sonya Partymaker
binary search
,
dp
3300
x349
713C
Sonya and Problem Wihtout a Legend
dp
,
sortings
2300
x5215
712D
Memory and Scores
combinatorics
,
dp
,
math
2200
x1816
710E
Generate a String
dfs and similar
,
dp
2000
x5124
708E
Student's Camp
dp
,
math
3100
x969
708C
Centroids
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2300
x3226
704C
Black Widow
dp
,
graphs
,
implementation
,
math
2900
x460
704B
Ant Man
dp
,
graphs
,
greedy
2500
x1768
703E
Mishka and Divisors
dp
,
number theory
2600
x593
700B
Connecting Universities
dfs and similar
,
dp
,
graphs
,
trees
1800
x3912
698C
LRU
bitmasks
,
dp
,
math
,
probabilities
2400
x1292
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x1280
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x2078
691F
Couple Cover
brute force
,
dp
,
number theory
2200
x1290
690D3
The Wall (hard)
dp
2100
x499
689E
Mike and Geometry Problem
combinatorics
,
data structures
,
dp
,
geometry
,
implementation
2000
x1911
687C
The Values You Can Make
dp
1900
x5312
685B
Kay and Snowflake
data structures
,
dfs and similar
,
dp
,
trees
1900
x3987
682D
Alyona and Strings
dp
,
strings
1900
x3273
679B
Bear and Tower of Cubes
binary search
,
dp
,
greedy
2200
x2132
678E
Another Sith Tournament
bitmasks
,
dp
,
math
,
probabilities
2200
x2150
677E
Vanya and Balloons
binary search
,
brute force
,
dp
,
implementation
2300
x600
677D
Vanya and Treasure
data structures
,
dp
,
graphs
,
shortest paths
2300
x1563
675E
Trains and Statistic
data structures
,
dp
,
greedy
2300
x2689
671D
Roads in Yusland
data structures
,
dp
,
greedy
2900
x1133
671A
Recycling Bottles
dp
,
geometry
,
greedy
,
implementation
1800
x4171
666A
Reberland Linguistics
dp
,
implementation
,
strings
1800
x3441
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x605
662E
To Hack or not to Hack
brute force
,
dp
,
greedy
3100
x138
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x1996
659G
Fence Divercity
combinatorics
,
dp
,
number theory
2300
x1175
650D
Zip-line
binary search
,
data structures
,
dp
,
hashing
2600
x1310
650C
Table Compression
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2200
x1965
650B
Image Preview
binary search
,
brute force
,
dp
,
two pointers
1900
x3328
645E
Intellectual Inquiry
dp
,
greedy
,
strings
2200
x1236
645D
Robot Rapping Results Report
binary search
,
dp
,
graphs
1800
x2862
643F
Bears and Juice
dp
,
math
,
meet-in-the-middle
2900
x697
643E
Bear and Destroying Subtrees
dp
,
math
,
probabilities
,
trees
2700
x625
643C
Levels and Regions
dp
2400
x1340
641D
Little Artem and Random Variable
dp
,
implementation
,
math
,
probabilities
2400
x1234
633F
The Chocolate Spree
dfs and similar
,
dp
,
graphs
,
trees
2600
x960
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