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Before contest
Codeforces Round 941 (Div. 1)
25:46:55
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Before contest
Codeforces Round 941 (Div. 2)
25:46:55
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combine-tags-by-or
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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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Name
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
x196
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
x250
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
x782
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
x2998
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
x6500
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
x13340
1957A
Stickogon
constructive algorithms
,
greedy
x17739
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x222
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x574
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1092
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x2837
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x9716
1956B
Nene and the Card Game
games
,
greedy
800
x17507
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x17656
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x912
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3048
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5412
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x6565
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x11890
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x16416
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x22204
1955A
Yogurt Sale
math
800
x33855
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x176
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1560
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4463
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x14384
1954B
Make It Ugly
implementation
,
math
1200
x14338
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x19029
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x673
1952I
Dark Matter
bitmasks
,
geometry
x319
1952H
Palindrome
implementation
,
strings
x335
1952G
Mathematician Takeover
binary search
,
dfs and similar
,
math
x897
1952F
Grid
brute force
x1617
1952E
Sweep Line
combinatorics
,
games
,
math
x200
1952D
Are You a Procrastinator?
implementation
x4046
1952C
They Have Fooled
brute force
,
schedules
x2675
1952B
Is it stated?
strings
x10131
1952A
Are You a Robot, Again?
strings
x11198
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x37
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x176
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x223
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x619
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2847
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x4488
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x9026
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x11367
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x15634
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3256
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x7146
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x11287
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x19424
1950C
Clock Conversion
implementation
,
math
800
x33615
1950B
Upscaling
implementation
800
x32007
1950A
Stair, Peak, or Neither?
implementation
800
x41780
1949K
Make Triangle
constructive algorithms
,
math
x222
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
x299
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
x1044
1949H
Division Avoidance
greedy
,
math
x65
1949G
Scooter
graphs
,
greedy
x601
1949F
Dating
greedy
,
sortings
,
trees
x687
1949E
Damage per Second
brute force
,
math
x77
1949D
Funny or Scary?
constructive algorithms
x296
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
x1066
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
x1527
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
x80
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x579
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1074
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2533
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x7976
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x14030
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x20052
1948A
Special Characters
brute force
,
constructive algorithms
800
x25811
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x736
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2011
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x3878
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x8796
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x17471
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x23056
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x460
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x604
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x3463
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x6728
1945D
Seraphim the Owl
dp
,
greedy
1300
x11721
1945C
Left and Right Houses
brute force
1200
x12400
1945B
Fireworks
math
,
number theory
900
x19081
1945A
Setting up Camp
greedy
,
math
800
x23987
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x13909
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x20697
1943F
Minimum Hamming Distance
dp
3500
x71
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x209
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x330
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x553
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1182
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1724
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3134
1943A
MEX Game 1
games
,
greedy
1300
x14843
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x54
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x349
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x528
1942E
Farm Game
combinatorics
,
games
2300
x1395
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