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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
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x5847
1975C
Chamo and Mocha's Array
binary search
,
brute force
,
greedy
1200
x14246
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
1000
x17462
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x18313
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
2000
x4142
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3499
1974E
Money Buys Happiness
dp
1800
x7775
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x14499
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x15465
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x29717
1974A
Phone Desktop
greedy
,
math
800
x32772
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x208
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
2500
x781
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1879
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x8175
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x13736
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x24056
1972B
Coin Games
games
900
x21170
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x22684
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1765
1971G
XOUR
data structures
,
dsu
,
sortings
1700
x8988
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x9720
1971E
Find the Car
binary search
,
math
,
sortings
1500
x13911
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x25458
1971C
Clock and Strings
implementation
900
x32176
1971B
Different String
implementation
,
strings
800
x36087
1971A
My First Sorting Problem
implementation
,
sortings
800
x43948
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x322
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x559
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x1293
1970F3
Playing Quidditch (Hard)
implementation
2300
x339
1970F2
Playing Quidditch (Medium)
implementation
2300
x329
1970F1
Playing Quidditch (Easy)
implementation
2300
x409
1970E3
Trails (Hard)
dp
,
matrices
2200
x706
1970E2
Trails (Medium)
dp
,
matrices
2000
x1213
1970E1
Trails (Easy)
dp
1800
x2060
1970D3
Arithmancy (Hard)
interactive
3100
x106
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x199
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x584
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x1476
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x2571
1970C1
Game on Tree (Easy)
games
1400
x3290
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x461
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x765
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x1087
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x440
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x425
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x4391
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x265
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1341
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x4452
1969C
Minimizing the Sum
dp
,
implementation
1700
x8513
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x18623
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x19694
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1918
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x4166
1968F
Equal XOR Segments
binary search
,
data structures
1800
x5363
1968E
Cells Arrangement
constructive algorithms
1600
x10202
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x14655
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x24486
1968B
Prefiquence
greedy
,
two pointers
800
x27560
1968A
Maximize?
brute force
,
math
,
number theory
800
x33647
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x64
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x101
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x211
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x638
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1713
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3872
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x13047
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x12259
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x14768
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x17638
1965F
Conference
data structures
,
flows
3300
x167
1965E
Connected Cubes
constructive algorithms
,
games
3100
x251
1965D
Missing Subarray Sum
constructive algorithms
2900
x408
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1887
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x6572
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x13451
1958J
Necromancer
*special problem
3200
x31
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
3100
x31
1958H
Composite Spells
*special problem
,
dp
2600
x75
1958G
Observation Towers
*special problem
2400
x107
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x189
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x250
1958D
Staircase
*special problem
1600
x500
1958C
Firewood
*special problem
1500
x694
1958B
Clock in the Pool
*special problem
,
math
1400
x874
1958A
1-3-5
*special problem
,
dp
1100
x1894
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x431
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x478
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1245
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x4412
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x9477
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x17701
1957A
Stickogon
constructive algorithms
,
greedy
800
x23030
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x346
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x827
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1419
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3850
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x12723
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