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Codeforces Round (Div. 3)
41:01:03
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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
1972B
Coin Games
games
,
games
x9371
1972A
Contest Proposal
greedy
,
greedy
x11089
1969F
Card Pairing
dp
,
greedy
x44
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
greedy
x535
1969D
Shop Game
data structures
,
greedy
,
sortings
x2173
1969C
Minimizing the Sum
dp
x4182
1969B
Shifts and Sorting
constructive algorithms
,
greedy
x11545
1969A
Two Friends
graphs
,
implementation
,
math
x13234
1967F
Next and Prev
brute force
,
data structures
,
dp
,
schedules
x3
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
x14
1967E1
Again Counting Arrays (Easy Version)
dp
,
fft
,
math
x48
1967D
Long Way to be Non-decreasing
binary search
,
implementation
,
two pointers
x139
1967C
Fenwick Tree
combinatorics
,
math
,
matrices
x651
1967B2
Reverse Card (Hard Version)
math
,
number theory
x1385
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
x6223
1967A
Permutation Counting
binary search
,
implementation
,
math
,
sortings
x5419
1966B
Rectangle Filling
constructive algorithms
x9594
1966A
Card Exchange
chinese remainder theorem
,
flows
,
greedy
,
string suffix structures
x12510
1965F
Conference
data structures
,
flows
x49
1965E
Connected Cubes
constructive algorithms
x138
1965D
Missing Subarray Sum
constructive algorithms
x200
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
x1163
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
x4083
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
x8283
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
x231
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
x289
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
x880
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
x3243
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
x6886
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
x13912
1957A
Stickogon
constructive algorithms
,
greedy
x18562
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x240
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x615
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1137
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x2965
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x10038
1956B
Nene and the Card Game
games
,
greedy
800
x18036
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x18152
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x943
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3182
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5577
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x6758
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x12185
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x16865
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x22764
1955A
Yogurt Sale
math
800
x34778
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x184
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1632
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4611
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x14830
1954B
Make It Ugly
implementation
,
math
1200
x14702
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x19537
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x677
1952I
Dark Matter
bitmasks
,
geometry
x326
1952H
Palindrome
implementation
,
strings
x344
1952G
Mathematician Takeover
binary search
,
dfs and similar
,
math
x904
1952F
Grid
brute force
x1623
1952E
Sweep Line
combinatorics
,
games
,
math
x203
1952D
Are You a Procrastinator?
implementation
x4081
1952C
They Have Fooled
brute force
,
schedules
x2690
1952B
Is it stated?
strings
x10195
1952A
Are You a Robot, Again?
strings
x11254
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x40
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x185
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x234
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x629
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2915
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x4558
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x9208
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x11557
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x15892
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3318
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x7266
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x11482
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x19671
1950C
Clock Conversion
implementation
,
math
800
x34028
1950B
Upscaling
implementation
800
x32443
1950A
Stair, Peak, or Neither?
implementation
800
x42383
1949K
Make Triangle
constructive algorithms
,
math
x223
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
x305
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
x1065
1949H
Division Avoidance
greedy
,
math
x68
1949G
Scooter
graphs
,
greedy
x616
1949F
Dating
greedy
,
sortings
,
trees
x706
1949E
Damage per Second
brute force
,
math
x78
1949D
Funny or Scary?
constructive algorithms
x296
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
x1089
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
x1555
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
x80
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x586
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1090
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2558
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8050
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x14155
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x20197
1948A
Special Characters
brute force
,
constructive algorithms
800
x25996
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x749
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2039
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x3928
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x8895
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