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Before contest
Codeforces Round #715 (Div. 1)
33:08:28
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*has extra registration
Before contest
Codeforces Round #715 (Div. 2)
33:08:28
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→ Filter Problems
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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
#
Name
1513F
Swapping Problem
brute force
,
constructive algorithms
,
data structures
,
sortings
x294
1513E
Cost Equilibrium
combinatorics
,
constructive algorithms
,
math
,
sortings
x620
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
x1914
1513C
Add One
dp
,
matrices
x5082
1513B
AND Sequences
bitmasks
,
combinatorics
,
constructive algorithms
,
constructive algorithms
,
math
x6245
1513A
Array and Peaks
constructive algorithms
,
implementation
x12330
1512G
Short Task
brute force
,
dp
,
math
,
number theory
x2624
1512F
Education
brute force
,
dp
,
greedy
,
implementation
x2334
1512E
Permutation by Sum
brute force
,
greedy
,
math
x4103
1512D
Corrupted Array
constructive algorithms
,
data structures
,
greedy
x8681
1512C
A-B Palindrome
constructive algorithms
,
implementation
,
strings
x8930
1512B
Almost Rectangle
implementation
x14826
1512A
Spy Detected!
brute force
,
implementation
x19383
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
games
,
two pointers
2700
x192
1511F
Chainword
data structures
,
dp
,
math
,
matrices
,
strings
2700
x79
1511E
Colorings and Dominoes
combinatorics
,
dp
,
greedy
,
math
2100
x1138
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x5119
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x11095
1511B
GCD Length
constructive algorithms
,
math
,
number theory
1100
x11196
1511A
Review Site
greedy
800
x15638
1510K
King's Task
brute force
,
graphs
,
implementation
1200
x2425
1510J
Japanese Game
constructive algorithms
,
math
2700
x141
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x178
1510H
Hard Optimization
dp
3200
x23
1510G
Guide
2100
x760
1510F
Fiber Shape
2800
x12
1510E
Equilibrium Point /\textbackslash/\textbackslash
2700
x105
1510D
Digits
dp
,
math
,
number theory
2100
x869
1510C
Cactus Not Enough
dfs and similar
,
graph matchings
,
graphs
2900
x71
1510B
Button Lock
flows
,
graph matchings
,
graphs
2600
x324
1510A
ASCII Automata Art
3100
x74
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x2386
1506F
Triangular Paths
constructive algorithms
,
graphs
,
math
,
shortest paths
,
sortings
2000
x1844
1506E
Restoring the Permutation
constructive algorithms
,
implementation
1500
x6832
1506D
Epic Transformation
constructive algorithms
,
data structures
,
greedy
1400
x9950
1506C
Double-ended Strings
brute force
,
implementation
,
strings
1000
x13506
1506B
Partial Replacement
greedy
,
implementation
1100
x13007
1506A
Strange Table
math
800
x19567
1505I
Mysterious language again, seriously?
x200
1505H
L BREAK into program
x229
1505G
Encoded message
implementation
x156
1505F
Math
math
x817
1505E
Cakewalk
greedy
,
implementation
,
shortest paths
x1246
1505D
Xenolith? Hippodrome?
number theory
x298
1505C
Fibonacci Words
implementation
x3817
1505B
DMCA
implementation
,
number theory
x3440
1505A
Is it rated - 2
implementation
,
interactive
x8369
1504B
Flip the Bits
constructive algorithms
,
greedy
,
implementation
,
math
1200
x10018
1504A
Déjà Vu
constructive algorithms
,
strings
800
x13962
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x31
1503E
2-Coloring
combinatorics
,
dp
,
math
3100
x125
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x479
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x1791
1503B
3-Coloring
constructive algorithms
,
games
,
interactive
1700
x4340
1503A
Balance the Bits
constructive algorithms
,
greedy
1600
x7437
1501B
Napoleon Cake
dp
,
implementation
,
sortings
900
x10084
1501A
Alexey and Train
implementation
800
x9271
1500F
Cupboards Jumps
dp
3500
x34
1500E
Subset Trick
binary search
,
data structures
3300
x81
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x153
1500C
Matrix Sorting
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
two pointers
2600
x396
1500B
Two chandeliers
binary search
,
brute force
,
chinese remainder theorem
,
math
,
number theory
2200
x1299
1500A
Going Home
brute force
,
hashing
,
implementation
,
math
1800
x5669
1499G
Graph Coloring
data structures
,
graphs
,
interactive
3100
x56
1499F
Diameter Cuts
combinatorics
,
dfs and similar
,
dp
,
trees
2400
x487
1499E
Chaotic Merge
combinatorics
,
dp
,
math
,
strings
2400
x775
1499D
The Number of Pairs
dp
,
math
,
number theory
2100
x3011
1499C
Minimum Grid Path
brute force
,
data structures
,
greedy
,
math
1500
x7587
1499B
Binary Removals
brute force
,
dp
,
greedy
,
implementation
1000
x12766
1499A
Domino on Windowsill
combinatorics
,
constructive algorithms
,
math
800
x15872
1498F
Christmas Game
bitmasks
,
data structures
,
dfs and similar
,
dp
,
games
,
math
,
trees
2500
x312
1498E
Two Houses
brute force
,
graphs
,
greedy
,
interactive
,
sortings
2200
x1233
1498D
Bananas in a Microwave
dfs and similar
,
dp
,
graphs
,
implementation
2200
x1571
1498C
Planar Reflections
brute force
,
data structures
,
dp
1600
x5507
1498B
Box Fitting
binary search
,
bitmasks
,
data structures
,
greedy
1300
x9129
1498A
GCD Sum
brute force
,
math
800
x14796
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x798
1497E1
Square-free division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x4709
1497D
Genius
bitmasks
,
dp
,
graphs
,
number theory
2500
x855
1497C2
k-LCM (hard version)
constructive algorithms
,
math
1600
x9072
1497C1
k-LCM (easy version)
constructive algorithms
,
math
1200
x12320
1497B
M-arrays
constructive algorithms
,
greedy
,
math
1200
x11373
1497A
Meximization
brute force
,
data structures
,
greedy
,
sortings
800
x16336
1496B
Max and Mex
math
1100
x11481
1496A
Split it!
brute force
,
constructive algorithms
,
greedy
,
strings
900
x13391
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x81
1495E
Qingshan and Daniel
brute force
,
data structures
,
greedy
,
implementation
3200
x115
1495D
BFS Trees
combinatorics
,
dfs and similar
,
graphs
,
math
,
shortest paths
,
trees
2600
x665
1495C
Garden of the Sun
constructive algorithms
,
graphs
2300
x1622
1495B
Let's Go Hiking
games
,
greedy
1900
x4121
1495A
Diamond Miner
geometry
,
greedy
,
math
,
sortings
1200
x11201
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x206
1494E
A-Z Graph
constructive algorithms
,
data structures
,
graphs
,
hashing
2400
x1061
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x1680
1494C
1D Sokoban
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1900
x3688
1494B
Berland Crossword
bitmasks
,
brute force
,
greedy
,
implementation
1400
x9224
1494A
ABC String
bitmasks
,
brute force
,
implementation
900
x14365
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x223
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x500
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x2868
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