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Problems
#
Name
808A
Lucky Year
implementation
900
x9044
807B
T-Shirt Hunt
brute force
,
implementation
1300
x3525
807A
Is it rated?
implementation
,
sortings
900
x19340
805B
3-palindrome
constructive algorithms
1000
x16049
805A
Fake NP
greedy
,
math
1000
x17548
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
x1255
804C
Ice cream coloring
constructive algorithms
,
dfs and similar
,
greedy
2200
x1610
804B
Minimum number of steps
combinatorics
,
greedy
,
implementation
,
math
1400
x9511
804A
Find Amir
constructive algorithms
,
greedy
,
math
1000
x15164
803G
Periodic RMQ Problem
data structures
2300
x1289
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x2977
803E
Roma and Poker
dp
,
graphs
2000
x2090
803D
Magazine Ad
binary search
,
greedy
1900
x3048
803C
Maximal GCD
constructive algorithms
,
greedy
,
math
1900
x4901
803B
Distances to Zero
constructive algorithms
1200
x6400
803A
Maximal Binary Matrix
constructive algorithms
1400
x4735
802O
April Fools' Problem (hard)
binary search
,
data structures
,
flows
2900
x810
802N
April Fools' Problem (medium)
binary search
,
flows
,
graphs
2400
x1083
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
x4250
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
x6673
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
x526
802B
Heidi and Library (medium)
data structures
,
greedy
1800
x1007
802A
Heidi and Library (easy)
greedy
1800
x1275
801B
Valued Keys
constructive algorithms
,
greedy
,
strings
900
x9999
801A
Vicious Keyboard
brute force
1100
x7206
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
x1968
799C
Fountains
binary search
,
data structures
,
implementation
1800
x3569
799B
T-shirt buying
data structures
,
implementation
1400
x8351
799A
Carrot Cakes
brute force
,
implementation
1100
x17632
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
x5573
798B
Mike and strings
brute force
,
dp
,
strings
1300
x8256
798A
Mike and palindrome
brute force
,
constructive algorithms
,
strings
1000
x21005
797F
Mice and Holes
data structures
,
dp
,
greedy
,
sortings
2600
x1076
797E
Array Queries
brute force
,
data structures
,
dp
2000
x4033
797D
Broken BST
data structures
,
dfs and similar
2100
x1745
797C
Minimal string
data structures
,
greedy
,
strings
1700
x6232
797B
Odd sum
dp
,
greedy
,
implementation
1400
x10117
797A
k-Factorization
implementation
,
math
,
number theory
1100
x13862
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
x5103
796C
Bank Hacking
constructive algorithms
,
data structures
,
dp
,
trees
1900
x2964
796B
Find The Bone
implementation
1300
x8940
796A
Buying A House
brute force
,
implementation
800
x12813
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
x3018
794B
Cutting Carrot
geometry
,
math
1200
x6304
794A
Bank Robbery
brute force
,
implementation
800
x6906
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
x1572
793C
Mice problem
geometry
,
implementation
,
math
,
sortings
2300
x1224
793B
Igor and his way to work
dfs and similar
,
graphs
,
implementation
,
shortest paths
1600
x4327
793A
Oleg and shares
implementation
,
math
900
x6516
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
x4162
792B
Counting-out Rhyme
implementation
1300
x5892
792A
New Bus Route
implementation
,
sortings
1100
x8709
791A
Bear and Big Brother
implementation
800
x177310
789B
Masha and geometric depression
brute force
,
implementation
,
math
1700
x4340
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
x2000
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2276
788A
Functions again
dp
,
two pointers
1600
x8945
787B
Not Afraid
greedy
,
implementation
,
math
1300
x5567
787A
The Monster
brute force
,
math
,
number theory
1200
x11020
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x598
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x133
786C
Till I Collapse
data structures
,
divide and conquer
2400
x2505
786B
Legacy
data structures
,
graphs
,
shortest paths
2300
x5374
786A
Berzerk
dfs and similar
,
dp
,
games
2000
x2303
785E
Anton and Permutation
brute force
,
data structures
2200
x1773
785D
Anton and School - 2
combinatorics
,
dp
,
math
,
number theory
2300
x2631
785C
Anton and Fairy Tale
binary search
,
math
1600
x7164
785B
Anton and Classes
greedy
,
sortings
1100
x10122
785A
Anton and Polyhedrons
implementation
,
strings
800
x81576
784G
BF Calculator
*special problem
2000
x719
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2-sat
binary search
bitmasks
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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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