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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
Add tag
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Problems
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Status
Standings
Custom test
Problems
#
Name
1523F
Favorite Game
bitmasks
,
dp
3300
x417
1523E
Crypto Lights
combinatorics
,
dp
,
math
,
probabilities
2600
x1677
1523D
Love-Hate
bitmasks
,
brute force
,
dp
,
probabilities
2400
x2174
1523C
Compression and Expansion
brute force
,
data structures
,
greedy
,
implementation
,
trees
1600
x8772
1523B
Lord of the Values
constructive algorithms
1100
x12096
1523A
Game of Life
implementation
800
x13488
1521E
Nastia and a Beautiful Matrix
binary search
,
constructive algorithms
,
dp
,
greedy
2700
x676
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1946
1521C
Nastia and a Hidden Permutation
constructive algorithms
,
interactive
2000
x4357
1521B
Nastia and a Good Array
constructive algorithms
,
math
,
number theory
1300
x21351
1521A
Nastia and Nearly Good Numbers
constructive algorithms
,
math
,
number theory
1000
x37147
1520G
To Go Or Not To Go?
brute force
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x3701
1520F2
Guess the K-th Zero (Hard version)
binary search
,
constructive algorithms
,
data structures
,
interactive
2200
x3011
1520F1
Guess the K-th Zero (Easy version)
binary search
,
interactive
1600
x11749
1520E
Arranging The Sheep
greedy
,
math
1400
x21418
1520D
Same Differences
data structures
,
hashing
,
math
1200
x46905
1520C
Not Adjacent Matrix
constructive algorithms
1000
x31741
1520B
Ordinary Numbers
brute force
,
math
,
number theory
800
x44430
1520A
Do Not Be Distracted!
brute force
,
implementation
800
x51667
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x414
1519E
Off by One
constructive algorithms
,
dfs and similar
,
geometry
,
graphs
,
sortings
,
trees
2700
x820
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x15250
1519C
Berland Regional
brute force
,
data structures
,
greedy
,
number theory
,
sortings
1400
x16945
1519B
The Cake Is a Lie
dp
,
math
800
x30851
1519A
Red and Blue Beans
math
800
x28816
1517H
Fly Around the World
dp
,
geometry
3500
x71
1517G
Starry Night Camping
constructive algorithms
,
flows
,
graphs
3300
x492
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x460
1517E
Group Photo
binary search
,
data structures
,
implementation
,
two pointers
2500
x967
1517D
Explorer Space
dp
,
graphs
,
shortest paths
1800
x7711
1517C
Fillomino 2
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
1400
x13364
1517B
Morning Jogging
constructive algorithms
,
greedy
,
sortings
1200
x13252
1517A
Sum of 2050
greedy
,
math
800
x25514
1516E
Baby Ehab Plays with Permutations
combinatorics
,
dp
,
math
2500
x869
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4361
1516C
Baby Ehab Partitions Again
bitmasks
,
constructive algorithms
,
dp
,
math
1700
x11955
1516B
AGAGA XOOORRR
bitmasks
,
brute force
,
dp
,
greedy
1500
x19376
1516A
Tit for Tat
greedy
800
x23397
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x280
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x233
1515G
Phoenix and Odometers
dfs and similar
,
graphs
,
math
,
number theory
2700
x1009
1515F
Phoenix and Earthquake
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2600
x1781
1515E
Phoenix and Computers
combinatorics
,
dp
,
math
2200
x3564
1515D
Phoenix and Socks
greedy
,
sortings
,
two pointers
1500
x11406
1515C
Phoenix and Towers
constructive algorithms
,
data structures
,
greedy
1400
x17115
1515B
Phoenix and Puzzle
brute force
,
geometry
,
math
,
number theory
1000
x24901
1515A
Phoenix and Gold
constructive algorithms
,
greedy
,
math
800
x20226
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x615
1514D
Cut and Stick
binary search
,
data structures
,
greedy
,
implementation
,
sortings
2000
x4307
1514C
Product 1 Modulo N
greedy
,
number theory
1600
x15136
1514B
AND 0, Sum Big
bitmasks
,
combinatorics
,
math
1200
x24939
1514A
Perfectly Imperfect Array
math
,
number theory
800
x24128
1513F
Swapping Problem
brute force
,
constructive algorithms
,
data structures
,
sortings
2500
x1277
1513E
Cost Equilibrium
combinatorics
,
constructive algorithms
,
math
,
sortings
2300
x1509
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x5401
1513C
Add One
dp
,
matrices
1600
x14014
1513B
AND Sequences
bitmasks
,
combinatorics
,
constructive algorithms
,
math
1400
x14720
1513A
Array and Peaks
constructive algorithms
,
implementation
800
x19366
1512G
Short Task
brute force
,
dp
,
math
,
number theory
1700
x8149
1512F
Education
brute force
,
dp
,
greedy
,
implementation
1900
x6232
1512E
Permutation by Sum
brute force
,
greedy
,
math
1600
x10474
1512D
Corrupted Array
constructive algorithms
,
data structures
,
greedy
1200
x22559
1512C
A-B Palindrome
constructive algorithms
,
implementation
,
strings
1200
x20182
1512B
Almost Rectangle
implementation
800
x25370
1512A
Spy Detected!
brute force
,
implementation
800
x64103
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x783
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x441
1511E
Colorings and Dominoes
combinatorics
,
dp
,
greedy
,
math
2100
x2594
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x11497
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x23820
1511B
GCD Length
constructive algorithms
,
math
,
number theory
1100
x22900
1511A
Review Site
greedy
800
x27583
1510K
King's Task
brute force
,
graphs
,
implementation
1200
x5453
1510J
Japanese Game
constructive algorithms
,
math
2700
x522
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x482
1510H
Hard Optimization
dp
3200
x98
1510G
Guide
2100
x1296
1510F
Fiber Shape
2800
x58
1510E
Equilibrium Point /\textbackslash/\textbackslash
2700
x255
1510D
Digits
dp
,
math
,
number theory
2100
x1904
1510C
Cactus Not Enough
dfs and similar
,
graph matchings
,
graphs
2900
x215
1510B
Button Lock
flows
,
graph matchings
,
graphs
2600
x746
1510A
ASCII Automata Art
3100
x154
1509C
The Sports Festival
dp
,
greedy
1800
x12555
1509B
TMT Document
greedy
1100
x21599
1509A
Average Height
constructive algorithms
800
x25988
1508F
Optimal Encoding
brute force
,
data structures
3500
x125
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x346
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
3000
x572
1508C
Complete the MST
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2500
x1496
1508B
Almost Sorted
binary search
,
combinatorics
,
constructive algorithms
,
implementation
1800
x3996
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x6227
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4315
1506F
Triangular Paths
constructive algorithms
,
graphs
,
math
,
shortest paths
,
sortings
2000
x3279
1506E
Restoring the Permutation
constructive algorithms
,
implementation
1500
x13097
1506D
Epic Transformation
constructive algorithms
,
data structures
,
greedy
1400
x21758
1506C
Double-ended Strings
brute force
,
implementation
,
strings
1000
x25051
1506B
Partial Replacement
greedy
,
implementation
1100
x20225
1506A
Strange Table
math
800
x30628
1505I
Mysterious language again, seriously?
*special problem
2200
x555
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