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Problems
#
Name
879B
Table Tennis
data structures
,
implementation
1200
x11846
879A
Borya's Diagnosis
implementation
900
x8946
878E
Numbers on the blackboard
combinatorics
,
dp
3300
x471
878D
Magic Breeding
bitmasks
2900
x640
878C
Tournament
data structures
,
graphs
2700
x884
878B
Teams Formation
data structures
,
implementation
2300
x1027
878A
Short Program
bitmasks
,
constructive algorithms
1600
x5261
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1603
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4231
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x3941
877C
Slava and tanks
constructive algorithms
1600
x5561
877B
Nikita and string
brute force
,
dp
1500
x9943
877A
Alex and broken contest
implementation
,
strings
1100
x10686
876B
Divisiblity of Differences
implementation
,
math
,
number theory
1300
x8678
876A
Trip For Meal
math
900
x9235
875F
Royal Questions
dsu
,
graphs
,
greedy
2500
x1247
875E
Delivery Club
binary search
,
data structures
,
dp
2600
x850
875D
High Cry
binary search
,
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
2200
x1970
875C
National Property
2-sat
,
dfs and similar
,
graphs
,
implementation
2100
x1905
875B
Sorting the Coins
dsu
,
implementation
,
sortings
,
two pointers
1500
x5114
875A
Classroom Watch
brute force
,
math
1200
x9488
873F
Forbidden Indices
dsu
,
string suffix structures
,
strings
2400
x1287
873E
Awards For Contestants
brute force
,
data structures
,
dp
2300
x488
873D
Merge Sort
constructive algorithms
,
divide and conquer
1800
x2993
873C
Strange Game On Matrix
greedy
,
two pointers
1600
x3209
873B
Balanced Substring
dp
,
implementation
1500
x7393
873A
Chores
implementation
800
x7981
871E
Restore the Tree
graphs
,
greedy
,
trees
2900
x146
870F
Paths
data structures
,
number theory
2700
x593
870E
Points, Lines and Ready-made Titles
dfs and similar
,
dsu
,
graphs
,
trees
2300
x974
870D
Something with XOR Queries
brute force
,
interactive
,
probabilities
2000
x1193
870C
Maximum splitting
dp
,
greedy
,
math
,
number theory
1300
x8950
870B
Maximum of Maximums of Minimums
greedy
1200
x9097
870A
Search for Pretty Integers
brute force
,
implementation
900
x9938
869E
The Untended Antiquity
data structures
,
hashing
2400
x1465
869D
The Overdosing Ubiquity
brute force
,
dfs and similar
,
graphs
2800
x235
869C
The Intriguing Obsession
combinatorics
,
dp
,
math
1800
x4350
869B
The Eternal Immortality
math
1100
x12868
869A
The Artful Expedient
brute force
,
implementation
1100
x9350
868G
El Toll Caves
math
3300
x119
868F
Yet Another Minimization Problem
divide and conquer
,
dp
2500
x3402
868E
Policeman and a Tree
dp
,
graphs
,
trees
2700
x446
868D
Huge Strings
bitmasks
,
brute force
,
dp
,
implementation
,
strings
2200
x890
868C
Qualification Rounds
bitmasks
,
brute force
,
constructive algorithms
,
dp
1500
x4520
868B
Race Against Time
implementation
1400
x3628
868A
Bark to Unlock
brute force
,
implementation
,
strings
900
x8509
867A
Between the Offices
implementation
800
x18729
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x130
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x67
865E
Hex Dyslexia
bitmasks
,
brute force
,
dp
,
graphs
3300
x118
865D
Buy Low Sell High
constructive algorithms
,
data structures
,
greedy
2400
x4714
865C
Gotta Go Fast
binary search
,
dp
2400
x809
865B
Ordering Pizza
binary search
,
sortings
,
ternary search
1900
x1649
865A
Save the problem!
constructive algorithms
1400
x4135
864F
Cities Excursions
dfs and similar
,
graphs
,
trees
2700
x577
864E
Fire
dp
,
sortings
2000
x4122
864D
Make a Permutation!
greedy
,
implementation
,
math
1500
x5953
864C
Bus
greedy
,
implementation
,
math
1500
x5824
864B
Polycarp and Letters
brute force
,
implementation
,
strings
1000
x8868
864A
Fair Game
implementation
,
sortings
1000
x11514
863G
Graphic Settings
3200
x53
863F
Almost Permutation
flows
2200
x1183
863E
Turn Off The TV
data structures
,
sortings
2000
x2942
863D
Yet Another Array Queries Problem
data structures
,
implementation
1800
x3135
863C
1-2-3
graphs
,
implementation
1800
x2402
863B
Kayaking
brute force
,
greedy
,
sortings
1500
x7533
863A
Quasi-palindrome
brute force
,
implementation
900
x9957
862F
Mahmoud and Ehab and the final stage
data structures
,
strings
2900
x197
862E
Mahmoud and Ehab and the function
binary search
,
data structures
,
sortings
2100
x1388
862D
Mahmoud and Ehab and the binary string
binary search
,
divide and conquer
,
interactive
2000
x1648
862C
Mahmoud and Ehab and the xor
constructive algorithms
1900
x3929
862B
Mahmoud and Ehab and the bipartiteness
dfs and similar
,
graphs
,
trees
1300
x15893
862A
Mahmoud and Ehab and the MEX
greedy
,
implementation
1000
x9348
860E
Arkady and a Nobody-men
data structures
,
dfs and similar
,
trees
2700
x419
859G
Circle of Numbers
math
3000
x144
859F
Ordering T-Shirts
greedy
2800
x159
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1640
859D
Third Month Insanity
dp
,
probabilities
,
trees
2100
x848
859C
Pie Rules
dp
,
games
1500
x5235
859B
Lazy Security Guard
brute force
,
geometry
,
math
1000
x6734
859A
Declined Finalists
greedy
,
implementation
800
x7608
858F
Wizard's Tour
constructive algorithms
,
dfs and similar
,
graphs
2300
x1469
858E
Tests Renumeration
greedy
,
implementation
2200
x495
858D
Polycarp's phone book
data structures
,
implementation
,
sortings
1600
x3709
858C
Did you mean...
dp
,
greedy
,
implementation
1500
x5441
858B
Which floor?
brute force
,
implementation
1500
x3687
858A
k-rounding
brute force
,
math
,
number theory
1100
x7841
856F
To Play or not to Play
greedy
3000
x101
856E
Satellites
3100
x65
856D
Masha and Cactus
dp
,
trees
2400
x367
856C
Eleventh Birthday
combinatorics
,
dp
,
math
2400
x522
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x475
856A
Set Theory
brute force
,
constructive algorithms
1600
x1357
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x199
855F
Nagini
binary search
,
data structures
3100
x412
855E
Salazar Slytherin's Locket
bitmasks
,
dp
2200
x1607
855D
Rowena Ravenclaw's Diadem
trees
2500
x474
855C
Helga Hufflepuff's Cup
dp
,
trees
2000
x1974
855B
Marvolo Gaunt's Ring
brute force
,
data structures
,
dp
1500
x8344
855A
Tom Riddle's Diary
brute force
,
implementation
,
strings
800
x20049
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Codeforces Round 941 (Div. 1)
19:12:11
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Codeforces Round 941 (Div. 2)
19:12:11
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combine-tags-by-or
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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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