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Codeforces Round (Div. 2)
5 days
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Difficulty:
—
implementation
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
1989A
Catch the Coin
implementation
800
x19213
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x11389
1985H2
Maximize the Largest Component (Hard Version)
data structures
,
dfs and similar
,
dp
,
dsu
,
implementation
2200
x1111
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
1700
x4149
1985D
Manhattan Circle
implementation
,
math
900
x28784
1985A
Creating Words
implementation
,
strings
800
x41828
1984G
Magic Trick II
constructive algorithms
,
implementation
,
sortings
3200
x162
1984D
''a'' String Problem
brute force
,
hashing
,
implementation
,
math
,
string suffix structures
,
strings
2000
x2654
1984B
Large Addition
implementation
,
math
1100
x15493
1982D
Beauty of the mountains
brute force
,
data structures
,
implementation
,
math
,
number theory
1700
x5222
1982B
Collatz Conjecture
brute force
,
implementation
,
math
,
number theory
1200
x13363
1982A
Soccer
greedy
,
implementation
,
math
,
sortings
800
x20656
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x4214
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x8657
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x12066
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x1111
1979A
Guess the Maximum
brute force
,
greedy
,
implementation
800
x26059
1978E
Computing Machine
brute force
,
data structures
,
dp
,
greedy
,
implementation
2000
x2821
1978D
Elections
data structures
,
greedy
,
implementation
,
math
1600
x8682
1978C
Manhattan Permutations
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1300
x11915
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x3424
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x8693
1976B
Increase/Decrease/Copy
greedy
,
implementation
1100
x19599
1976A
Verify Password
implementation
,
sortings
,
strings
800
x25239
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x1894
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x17068
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3067
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x12894
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x27877
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x175
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x7262
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x21783
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x8567
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x22972
1971C
Clock and Strings
implementation
900
x28779
1971B
Different String
implementation
,
strings
800
x32596
1971A
My First Sorting Problem
implementation
,
sortings
800
x39391
1970F3
Playing Quidditch (Hard)
implementation
2300
x301
1970F2
Playing Quidditch (Medium)
implementation
2300
x292
1970F1
Playing Quidditch (Easy)
implementation
2300
x365
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x3472
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x194
1969C
Minimizing the Sum
dp
,
implementation
1700
x7358
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x18372
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x49
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x535
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x10918
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x13492
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x16525
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x744
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1330
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3518
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3930
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x7804
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x19374
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x25640
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1983
1954B
Make It Ugly
implementation
,
math
1200
x16989
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x722
1952H
Palindrome
implementation
,
strings
x384
1952D
Are You a Procrastinator?
implementation
x4330
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3273
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3863
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x8279
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x13088
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x21583
1950C
Clock Conversion
implementation
,
math
800
x37038
1950B
Upscaling
implementation
800
x35370
1950A
Stair, Peak, or Neither?
implementation
800
x47108
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x346
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2753
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x21489
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4292
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x9774
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x24792
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x676
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3520
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x616
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2579
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x17358
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x181
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x13874
1937A
Shuffle Party
implementation
,
math
800
x22216
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1163
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2578
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x412
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x7661
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x10312
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x21412
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x31029
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x7388
1932D
Card Game
greedy
,
implementation
1400
x10553
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x14573
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x27909
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2458
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x222
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x4010
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x3225
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1572
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x10853
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