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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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Custom test
Problems
#
Name
1505H
L BREAK into program
*special problem
2500
x511
1505G
Encoded message
*special problem
,
implementation
2600
x306
1505F
Math
*special problem
,
math
2200
x1504
1505E
Cakewalk
*special problem
,
greedy
,
implementation
,
shortest paths
1800
x1803
1505D
Xenolith? Hippodrome?
*special problem
,
number theory
1800
x796
1505C
Fibonacci Words
*special problem
,
implementation
1400
x6437
1505B
DMCA
*special problem
,
implementation
,
number theory
1600
x6162
1505A
Is it rated - 2
*special problem
,
implementation
,
interactive
900
x14479
1504B
Flip the Bits
constructive algorithms
,
greedy
,
implementation
,
math
1200
x18541
1504A
Déjà Vu
constructive algorithms
,
strings
800
x21721
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x183
1503E
2-Coloring
combinatorics
,
dp
,
math
3100
x704
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x1085
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3429
1503B
3-Coloring
constructive algorithms
,
games
,
interactive
1700
x7041
1503A
Balance the Bits
constructive algorithms
,
greedy
1600
x13410
1501B
Napoleon Cake
dp
,
implementation
,
sortings
900
x19137
1501A
Alexey and Train
implementation
800
x11596
1500F
Cupboards Jumps
dp
3500
x349
1500E
Subset Trick
binary search
,
data structures
3300
x217
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x458
1500C
Matrix Sorting
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
two pointers
2600
x808
1500B
Two chandeliers
binary search
,
brute force
,
chinese remainder theorem
,
math
,
number theory
2200
x2047
1500A
Going Home
brute force
,
hashing
,
implementation
,
math
1800
x8826
1499G
Graph Coloring
data structures
,
graphs
,
interactive
3100
x191
1499F
Diameter Cuts
combinatorics
,
dfs and similar
,
dp
,
trees
2400
x1344
1499E
Chaotic Merge
combinatorics
,
dp
,
math
,
strings
2400
x1505
1499D
The Number of Pairs
dp
,
math
,
number theory
2100
x5843
1499C
Minimum Grid Path
brute force
,
data structures
,
greedy
,
math
1500
x12647
1499B
Binary Removals
brute force
,
dp
,
greedy
,
implementation
1000
x20766
1499A
Domino on Windowsill
combinatorics
,
constructive algorithms
,
math
800
x21250
1498F
Christmas Game
bitmasks
,
data structures
,
dfs and similar
,
dp
,
games
,
math
,
trees
2500
x920
1498E
Two Houses
brute force
,
graphs
,
greedy
,
interactive
,
sortings
2200
x1924
1498D
Bananas in a Microwave
dfs and similar
,
dp
,
graphs
,
implementation
2200
x2320
1498C
Planar Reflections
brute force
,
data structures
,
dp
1600
x9707
1498B
Box Fitting
binary search
,
bitmasks
,
data structures
,
greedy
1300
x17196
1498A
GCD Sum
brute force
,
math
800
x23248
1497E2
Square-Free Division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1700
1497E1
Square-Free Division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x8323
1497D
Genius
bitmasks
,
dp
,
graphs
,
number theory
2500
x1528
1497C2
k-LCM (hard version)
constructive algorithms
,
math
1600
x17275
1497C1
k-LCM (easy version)
constructive algorithms
,
math
1200
x25780
1497B
M-arrays
constructive algorithms
,
greedy
,
math
1200
x19942
1497A
Meximization
brute force
,
data structures
,
greedy
,
sortings
800
x24439
1496B
Max and Mex
math
1100
x17554
1496A
Split it!
brute force
,
constructive algorithms
,
greedy
,
strings
900
x20913
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x301
1495E
Qingshan and Daniel
brute force
,
data structures
,
greedy
,
implementation
3200
x415
1495D
BFS Trees
combinatorics
,
dfs and similar
,
graphs
,
math
,
shortest paths
,
trees
2600
x1321
1495C
Garden of the Sun
constructive algorithms
,
graphs
2300
x2629
1495B
Let's Go Hiking
games
,
greedy
1900
x6006
1495A
Diamond Miner
geometry
,
greedy
,
math
,
sortings
1200
x17076
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x375
1494E
A-Z Graph
constructive algorithms
,
data structures
,
graphs
,
hashing
2400
x1769
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2577
1494C
1D Sokoban
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1900
x5432
1494B
Berland Crossword
bitmasks
,
brute force
,
greedy
,
implementation
1400
x14370
1494A
ABC String
bitmasks
,
brute force
,
implementation
900
x20887
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x430
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x937
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x5001
1493C
K-beautiful Strings
binary search
,
brute force
,
constructive algorithms
,
greedy
,
strings
2000
x4608
1493B
Planet Lapituletti
brute force
,
implementation
1300
x11846
1493A
Anti-knapsack
constructive algorithms
,
greedy
800
x19299
1492E
Almost Fault-Tolerant Database
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
2500
x1186
1492D
Genius's Gambit
bitmasks
,
constructive algorithms
,
greedy
,
math
1900
x6093
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x16095
1492B
Card Deck
data structures
,
greedy
,
math
1100
x18404
1492A
Three swimmers
math
800
x22643
1491I
Ruler Of The Zoo
brute force
,
data structures
3500
x83
1491H
Yuezheng Ling and Dynamic Tree
data structures
,
trees
3400
x811
1491G
Switch and Flip
constructive algorithms
,
graphs
,
math
2800
x823
1491F
Magnets
binary search
,
constructive algorithms
,
interactive
2700
x998
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2155
1491D
Zookeeper and The Infinite Zoo
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
1800
x7177
1491C
Pekora and Trampoline
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x7918
1491B
Minimal Cost
brute force
,
math
1200
x13801
1491A
K-th Largest Value
brute force
,
greedy
,
implementation
800
x18217
1490G
Old Floppy Drive
binary search
,
data structures
,
math
1900
x5647
1490F
Equalize the Array
binary search
,
data structures
,
greedy
,
math
,
sortings
1500
x16165
1490E
Accidental Victory
binary search
,
data structures
,
greedy
1400
x19083
1490D
Permutation Transformation
dfs and similar
,
divide and conquer
,
implementation
1200
x19520
1490C
Sum of Cubes
binary search
,
brute force
,
brute force
,
math
1100
x33245
1490B
Balanced Remainders
brute force
,
constructive algorithms
,
math
1000
x26192
1490A
Dense Array
greedy
,
math
800
x31168
1488J
Flower Shop
*special problem
,
data structures
,
fft
,
math
3100
x35
1488I
Demonic Invasion
*special problem
,
flows
3100
x37
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x58
1488G
Painting Numbers
*special problem
,
data structures
,
greedy
,
number theory
2500
x123
1488F
Dogecoin
*special problem
,
*special problem
,
binary search
,
data structures
2300
x176
1488E
Palindromic Doubles
*special problem
,
data structures
,
dp
2200
x212
1488D
Problemsolving Marathon
*special problem
,
binary search
,
greedy
1900
x337
1488C
Two Policemen
*special problem
,
binary search
,
brute force
,
math
1900
x405
1488B
RBS Deletion
*special problem
,
greedy
1800
x558
1488A
From Zero To Y
*special problem
,
math
900
x1413
1487G
String Counting
combinatorics
,
dp
,
fft
,
math
2700
x595
1487F
Ones
dp
,
greedy
,
shortest paths
2900
x382
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4553
1487D
Pythagorean Triples
binary search
,
brute force
,
math
,
number theory
1500
x17921
1487C
Minimum Ties
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
1500
x14154
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