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Codeforces Round 940 (Div. 2)
4 days
Register now »
*has extra registration
→ Filter Problems
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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Status
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Custom test
Problems
#
Name
808A
Lucky Year
implementation
900
x9039
807B
T-Shirt Hunt
brute force
,
implementation
1300
x3525
807A
Is it rated?
implementation
,
sortings
900
x19332
805B
3-palindrome
constructive algorithms
1000
x16039
805A
Fake NP
greedy
,
math
1000
x17542
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x136
804E
The same permutation
constructive algorithms
3100
x407
804D
Expected diameter of a tree
binary search
,
brute force
,
dfs and similar
,
dp
,
sortings
,
trees
2500
x1254
804C
Ice cream coloring
constructive algorithms
,
dfs and similar
,
greedy
2200
x1610
804B
Minimum number of steps
combinatorics
,
greedy
,
implementation
,
math
1400
x9508
804A
Find Amir
constructive algorithms
,
greedy
,
math
1000
x15161
803G
Periodic RMQ Problem
data structures
2300
x1288
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x2976
803E
Roma and Poker
dp
,
graphs
2000
x2087
803D
Magazine Ad
binary search
,
greedy
1900
x3044
803C
Maximal GCD
constructive algorithms
,
greedy
,
math
1900
x4897
803B
Distances to Zero
constructive algorithms
1200
x6399
803A
Maximal Binary Matrix
constructive algorithms
1400
x4733
802O
April Fools' Problem (hard)
binary search
,
data structures
,
flows
2900
x806
802N
April Fools' Problem (medium)
binary search
,
flows
,
graphs
2400
x1075
802M
April Fools' Problem (easy)
greedy
,
sortings
1200
x3009
802L
Send the Fool Further! (hard)
dfs and similar
,
dp
,
math
,
trees
2400
x276
802K
Send the Fool Further! (medium)
dp
,
trees
2100
x576
802J
Send the Fool Further! (easy)
dfs and similar
,
graphs
,
trees
1400
x4245
802I
Fake News (hard)
string suffix structures
2300
x1406
802H
Fake News (medium)
constructive algorithms
,
strings
2200
x424
802G
Fake News (easy)
implementation
,
strings
800
x6668
802F
Marmots (hard)
math
,
probabilities
2800
x119
802E
Marmots (medium)
math
2200
x236
802D
Marmots (easy)
math
2100
x434
802C
Heidi and Library (hard)
flows
2600
x521
802B
Heidi and Library (medium)
data structures
,
greedy
1800
x1006
802A
Heidi and Library (easy)
greedy
1800
x1274
801B
Valued Keys
constructive algorithms
,
greedy
,
strings
900
x9997
801A
Vicious Keyboard
brute force
1100
x7204
799G
Cut the pie
binary search
,
data structures
,
geometry
3500
x106
799F
Beautiful fountains rows
data structures
3500
x416
799E
Aquarium decoration
data structures
,
greedy
,
two pointers
2500
x909
799D
Field expansion
brute force
,
dp
,
meet-in-the-middle
2100
x1967
799C
Fountains
binary search
,
data structures
,
implementation
1800
x3568
799B
T-shirt buying
data structures
,
implementation
1400
x8344
799A
Carrot Cakes
brute force
,
implementation
1100
x17583
798E
Mike and code of a permutation
constructive algorithms
,
data structures
,
graphs
,
sortings
3000
x449
798D
Mike and distribution
constructive algorithms
,
sortings
2400
x1834
798C
Mike and gcd problem
dp
,
greedy
,
number theory
1700
x5570
798B
Mike and strings
brute force
,
dp
,
strings
1300
x8254
798A
Mike and palindrome
brute force
,
constructive algorithms
,
strings
1000
x20983
797F
Mice and Holes
data structures
,
dp
,
greedy
,
sortings
2600
x1075
797E
Array Queries
brute force
,
data structures
,
dp
2000
x4026
797D
Broken BST
data structures
,
dfs and similar
2100
x1745
797C
Minimal string
data structures
,
greedy
,
strings
1700
x6221
797B
Odd sum
dp
,
greedy
,
implementation
1400
x10114
797A
k-Factorization
implementation
,
math
,
number theory
1100
x13847
796F
Sequence Recovery
bitmasks
,
data structures
,
greedy
2800
x168
796E
Exam Cheating
binary search
,
dp
2400
x617
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5101
796C
Bank Hacking
constructive algorithms
,
data structures
,
dp
,
trees
1900
x2963
796B
Find The Bone
implementation
1300
x8936
796A
Buying A House
brute force
,
implementation
800
x12811
794G
Replace All
combinatorics
,
dp
,
math
3400
x318
794F
Leha and security system
data structures
2800
x727
794E
Choosing Carrot
games
,
math
2800
x658
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x753
794C
Naming Company
games
,
greedy
,
sortings
1800
x3017
794B
Cutting Carrot
geometry
,
math
1200
x6304
794A
Bank Robbery
brute force
,
implementation
800
x6905
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x311
793F
Julia the snail
data structures
,
divide and conquer
,
dp
3000
x504
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x238
793D
Presents in Bankopolis
dp
,
graphs
,
shortest paths
2100
x1570
793C
Mice problem
geometry
,
implementation
,
math
,
sortings
2300
x1224
793B
Igor and his way to work
dfs and similar
,
graphs
,
implementation
,
shortest paths
1600
x4326
793A
Oleg and shares
implementation
,
math
900
x6514
792F
Mages and Monsters
data structures
,
geometry
3100
x198
792E
Colored Balls
greedy
,
math
,
number theory
2500
x1032
792D
Paths in a Complete Binary Tree
bitmasks
,
trees
1900
x2889
792C
Divide by Three
dp
,
greedy
,
math
,
number theory
2000
x4161
792B
Counting-out Rhyme
implementation
1300
x5891
792A
New Bus Route
implementation
,
sortings
1100
x8703
791A
Bear and Big Brother
implementation
800
x177112
789B
Masha and geometric depression
brute force
,
implementation
,
math
1700
x4339
789A
Anastasia and pebbles
implementation
,
math
1100
x9209
788E
New task
data structures
2900
x329
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x355
788C
The Great Mixing
dfs and similar
,
graphs
,
shortest paths
2300
x1999
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2276
788A
Functions again
dp
,
two pointers
1600
x8935
787B
Not Afraid
greedy
,
implementation
,
math
1300
x5567
787A
The Monster
brute force
,
math
,
number theory
1200
x11018
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x598
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x132
786C
Till I Collapse
data structures
,
divide and conquer
2400
x2505
786B
Legacy
data structures
,
graphs
,
shortest paths
2300
x5371
786A
Berzerk
dfs and similar
,
dp
,
games
2000
x2301
785E
Anton and Permutation
brute force
,
data structures
2200
x1773
785D
Anton and School - 2
combinatorics
,
dp
,
math
,
number theory
2300
x2628
785C
Anton and Fairy Tale
binary search
,
math
1600
x7161
785B
Anton and Classes
greedy
,
sortings
1100
x10122
785A
Anton and Polyhedrons
implementation
,
strings
800
x81523
784G
BF Calculator
*special problem
2000
x717
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