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Before contest
Codeforces Round (Div. 2)
7 days
→ Filter Problems
Difficulty:
—
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
Standings
Custom test
Problems
#
Name
737F
Dirty plates
constructive algorithms
,
math
3300
x70
737E
Tanya is 5!
graph matchings
,
graphs
,
greedy
,
schedules
3300
x121
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x187
736D
Permutations
math
,
matrices
2800
x461
735E
Ostap and Tree
dp
,
trees
2500
x870
735D
Taxes
math
,
number theory
1600
x13427
735C
Tennis Championship
combinatorics
,
constructive algorithms
,
greedy
,
math
1600
x7509
735B
Urbanization
greedy
,
number theory
,
sortings
1100
x8387
735A
Ostap and Grasshopper
implementation
,
strings
800
x12464
734F
Anton and School
bitmasks
,
constructive algorithms
,
implementation
,
math
2500
x1297
734E
Anton and Tree
dfs and similar
,
dp
,
trees
2100
x4170
734D
Anton and Chess
implementation
1700
x3726
734C
Anton and Making Potions
binary search
,
dp
,
greedy
,
two pointers
1600
x5340
734B
Anton and Digits
brute force
,
greedy
,
implementation
,
math
800
x29279
734A
Anton and Danik
implementation
,
strings
800
x151125
733F
Drivers Dissatisfaction
data structures
,
dsu
,
graphs
,
trees
2200
x1116
733E
Sleep in Class
constructive algorithms
,
data structures
,
math
,
two pointers
2400
x899
733D
Kostya the Sculptor
data structures
,
hashing
1600
x4171
733C
Epidemic in Monstropolis
constructive algorithms
,
dp
,
greedy
,
two pointers
1800
x3343
733B
Parade
math
1100
x10675
733A
Grasshopper And the String
implementation
1000
x16144
732F
Tourist Reform
dfs and similar
,
graphs
2300
x2527
732E
Sockets
greedy
,
sortings
2100
x1605
732D
Exams
binary search
,
greedy
,
sortings
1700
x5518
732C
Sanatorium
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
1200
x9716
732B
Cormen --- The Best Friend Of a Man
dp
,
greedy
1000
x24499
732A
Buy a Shovel
brute force
,
constructive algorithms
,
implementation
,
math
800
x72090
731F
Video Cards
brute force
,
data structures
,
implementation
,
math
,
number theory
1900
x2868
731E
Funny Game
dp
,
games
2200
x1667
731D
80-th Level Archeology
brute force
,
data structures
,
greedy
,
sortings
2200
x1172
731C
Socks
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x6961
731B
Coupons and Discounts
constructive algorithms
,
greedy
1100
x7963
731A
Night at the Museum
implementation
,
strings
800
x45616
730L
Expression Queries
data structures
3200
x86
730K
Roads Orientation Problem
graphs
3200
x100
730J
Bottles
dp
1900
x3386
730I
Olympiad in Programming and Sports
dp
,
flows
,
graphs
,
greedy
2000
x2049
730H
Delete Them
constructive algorithms
,
implementation
1300
x2994
730G
Car Repair Shop
implementation
1600
x2151
730F
Ber Patio
3100
x91
730E
Award Ceremony
greedy
,
implementation
2200
x722
730D
Running Over The Bridges
greedy
,
implementation
,
math
2200
x881
730C
Bulmart
binary search
,
dfs and similar
2100
x1231
730B
Minimum and Maximum
constructive algorithms
,
interactive
1800
x2453
730A
Toda 2
greedy
,
implementation
1800
x1571
729F
Financiers Game
dp
2500
x949
729E
Subordinates
constructive algorithms
,
data structures
,
graphs
,
greedy
,
sortings
1900
x2233
729D
Sea Battle
constructive algorithms
,
greedy
,
math
1700
x3726
729C
Road to Cinema
binary search
,
greedy
,
sortings
1700
x3918
729B
Spotlights
dp
,
implementation
1200
x7937
729A
Interview with Oleg
implementation
,
strings
900
x7419
727F
Polycarp's problems
binary search
,
dp
,
greedy
2300
x793
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x1207
727D
T-shirts Distribution
constructive algorithms
,
flows
,
greedy
1800
x1857
727C
Guess the Array
constructive algorithms
,
interactive
,
math
1400
x7380
727B
Bill Total Value
expression parsing
,
implementation
,
strings
1600
x1993
727A
Transformation: from A to B
brute force
,
dfs and similar
,
math
1000
x13791
725G
Messages on a Tree
3300
x164
725F
Family Photos
games
,
greedy
2900
x533
725E
Too Much Money
brute force
,
greedy
2600
x652
725D
Contest Balloons
data structures
,
greedy
1800
x2804
725C
Hidden Word
brute force
,
constructive algorithms
,
implementation
,
strings
1600
x2641
725B
Food on the Plane
implementation
,
math
1200
x5134
725A
Jumping Ball
implementation
1000
x7080
724G
Xor-matic Number of the Graph
bitmasks
,
graphs
,
math
,
number theory
,
trees
2600
x1051
724F
Uniformly Branched Trees
combinatorics
,
dp
,
trees
2700
x401
724E
Goods transportation
dp
,
flows
,
greedy
2900
x1306
724D
Dense Subsequence
data structures
,
greedy
,
strings
1900
x2334
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2142
724B
Batch Sort
brute force
,
greedy
,
implementation
,
math
1500
x4012
724A
Checking the Calendar
implementation
1000
x7084
723F
st-Spanning Tree
dsu
,
graphs
,
greedy
,
implementation
2300
x1474
723E
One-Way Reform
constructive algorithms
,
dfs and similar
,
flows
,
graphs
,
greedy
2200
x1966
723D
Lakes in Berland
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1600
x6954
723C
Polycarp at the Radio
greedy
1600
x4635
723B
Text Document Analysis
expression parsing
,
implementation
,
strings
1100
x10183
723A
The New Year: Meeting Friends
implementation
,
math
,
sortings
800
x77931
722F
Cyclic Cipher
chinese remainder theorem
,
data structures
,
implementation
,
number theory
,
two pointers
2800
x498
722E
Research Rover
combinatorics
,
dp
2900
x871
722D
Generating Sets
binary search
,
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
1900
x3164
722C
Destroying Array
data structures
,
dsu
1600
x9327
722B
Verse Pattern
implementation
,
strings
1200
x6466
722A
Broken Clock
brute force
,
implementation
1300
x6635
721E
Road to Home
binary search
,
dp
2700
x305
721D
Maxim and Array
constructive algorithms
,
data structures
,
greedy
,
math
2000
x2349
721C
Journey
dp
,
graphs
1800
x5860
721B
Passwords
implementation
,
math
,
sortings
,
strings
1100
x12083
721A
One-dimensional Japanese Crossword
implementation
800
x18443
720F
Array Covering
data structures
3100
x146
720E
Cipher
implementation
3100
x65
720D
Slalom
data structures
,
dp
,
sortings
3100
x245
720C
Homework
constructive algorithms
3100
x102
720B
Cactusophobia
dfs and similar
,
flows
2400
x401
720A
Closing ceremony
greedy
2000
x861
719B
Anatoly and Cockroaches
greedy
1400
x8482
719A
Vitya in the Countryside
implementation
1100
x15539
718E
Matvey's Birthday
bitmasks
,
graphs
3300
x352
718D
Andrew and Chemistry
dp
,
hashing
,
trees
2900
x394
718C
Sasha and Array
data structures
,
math
,
matrices
2300
x3858
718A
Efim and Strange Grade
dp
,
implementation
,
math
1700
x4399
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