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Before contest
Codeforces Round 942 (Div. 1)
04:00:10
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*has extra registration
Before contest
Codeforces Round 942 (Div. 2)
04:00:10
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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
#
Name
1969F
Card Pairing
dp
,
greedy
x35
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
greedy
x480
1969D
Shop Game
data structures
,
greedy
,
sortings
x1965
1969C
Minimizing the Sum
dp
x3741
1969B
Shifts and Sorting
constructive algorithms
,
greedy
x10987
1969A
Two Friends
graphs
,
implementation
,
math
x12700
1966B
Rectangle Filling
constructive algorithms
x9612
1966A
Card Exchange
chinese remainder theorem
,
flows
,
greedy
,
string suffix structures
x12549
1965F
Conference
data structures
,
flows
x47
1965E
Connected Cubes
constructive algorithms
x136
1965D
Missing Subarray Sum
constructive algorithms
x191
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
x1139
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
x4028
1965A
Everything Nim
games
,
greedy
,
math
x8229
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
x229
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
x286
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
x877
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
x3228
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
x6862
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
x13882
1957A
Stickogon
constructive algorithms
,
greedy
x18526
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x238
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x610
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1131
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x2959
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x10013
1956B
Nene and the Card Game
games
,
greedy
800
x17984
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x18105
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x942
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3168
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5566
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x6748
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x12156
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x16816
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x22703
1955A
Yogurt Sale
math
800
x34669
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x184
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1629
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4597
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x14796
1954B
Make It Ugly
implementation
,
math
1200
x14663
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x19489
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
x343
1952G
Mathematician Takeover
binary search
,
dfs and similar
,
math
x903
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
x10191
1952A
Are You a Robot, Again?
strings
x11250
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
x233
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x628
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2911
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x4557
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x9195
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x11541
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x15871
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3310
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x7257
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x11466
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x19643
1950C
Clock Conversion
implementation
,
math
800
x33973
1950B
Upscaling
implementation
800
x32392
1950A
Stair, Peak, or Neither?
implementation
800
x42308
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
x1553
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
x80
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x585
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1087
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2551
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8038
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x14136
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x20171
1948A
Special Characters
brute force
,
constructive algorithms
800
x25967
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
x3924
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x8889
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x17582
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x23196
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x468
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x610
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x3496
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x6787
1945D
Seraphim the Owl
dp
,
greedy
1300
x11822
1945C
Left and Right Houses
brute force
1200
x12501
1945B
Fireworks
math
,
number theory
900
x19223
1945A
Setting up Camp
greedy
,
math
800
x24199
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