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Name
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
x3366
1985E
Secret Box
brute force
,
combinatorics
,
math
x14206
1985B
Maximum Multiple Sum
brute force
,
math
,
number theory
x33586
1984F
Reconstruction
brute force
,
dp
,
math
2500
x629
1984D
''a'' String Problem
brute force
,
hashing
,
implementation
,
math
,
string suffix structures
,
strings
2000
x2358
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x3842
1981A
Turtle and Piggy Are Playing a Game
brute force
,
greedy
,
math
800
x18417
1979F
Kostyanych's Theorem
brute force
,
constructive algorithms
,
graphs
,
interactive
2900
x180
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x4984
1979A
Guess the Maximum
brute force
,
greedy
,
implementation
800
x24580
1977D
XORificator
bitmasks
,
brute force
,
greedy
,
hashing
2300
x1389
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x5384
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x624
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x4733
1975C
Chamo and Mocha's Array
binary search
,
brute force
,
greedy
1200
x11913
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
1000
x14719
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x16423
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x2920
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x159
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1620
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x21059
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x20438
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x8251
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x419
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x470
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x371
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1600
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x13000
1968A
Maximize?
brute force
,
math
,
number theory
800
x29965
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x46
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1429
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3418
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x11365
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1080
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3938
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x728
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1308
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3456
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x20012
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1105
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3827
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x7645
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x715
1952F
Grid
brute force
x1677
1952C
They Have Fooled
brute force
,
schedules
x2772
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3218
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x8081
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x12841
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x21311
1949E
Damage per Second
brute force
,
math
2900
x89
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x2305
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x91
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x648
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2718
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8523
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x15128
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x21169
1948A
Special Characters
brute force
,
constructive algorithms
800
x27027
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4231
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x548
1945C
Left and Right Houses
brute force
1200
x13536
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x387
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1308
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x603
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x27384
1941A
Rudolf and the Ticket
brute force
,
math
800
x40006
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1214
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7410
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x193
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x17302
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x904
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x21156
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x14305
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x26911
1931A
Recovering a Small String
brute force
,
strings
800
x34238
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x631
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3807
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x14110
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1669
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1551
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x13690
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1592
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3879
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x7809
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x19002
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x26211
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1549
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x18717
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x343
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5330
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1163
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3550
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x9133
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x900
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5223
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x12205
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x26825
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x9637
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x20053
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x589
←
1
2
3
...
16
17
→
→ Pay attention
Before contest
Codeforces Round (Div. 3)
6 days
→ Filter Problems
Difficulty:
—
brute force
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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