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Codeforces Round 940 (Div. 2) and CodeCraft-23
35:31:03
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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
#
Name
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x171
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x480
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x945
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x2416
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x8699
1956B
Nene and the Card Game
games
,
greedy
800
x16018
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x16194
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x835
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x2797
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5068
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x6151
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x11237
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x15516
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x21087
1955A
Yogurt Sale
math
800
x32028
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x149
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1379
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4110
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x13364
1954B
Make It Ugly
implementation
,
math
1200
x13436
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x17956
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x658
1952I
Dark Matter
bitmasks
,
geometry
x301
1952H
Palindrome
implementation
,
strings
x313
1952G
Mathematician Takeover
binary search
,
dfs and similar
,
math
x873
1952F
Grid
brute force
x1588
1952E
Sweep Line
combinatorics
,
games
,
math
x193
1952D
Are You a Procrastinator?
implementation
x3978
1952C
They Have Fooled
brute force
,
schedules
x2633
1952B
Is it stated?
strings
x10029
1952A
Are You a Robot, Again?
strings
x11076
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x30
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x161
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x191
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x590
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2742
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x4344
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x8653
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x10972
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x15146
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3112
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x6915
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x10957
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x18995
1950C
Clock Conversion
implementation
,
math
800
x32970
1950B
Upscaling
implementation
800
x31326
1950A
Stair, Peak, or Neither?
implementation
800
x40651
1949K
Make Triangle
constructive algorithms
,
math
x215
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
x294
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
x1034
1949H
Division Avoidance
greedy
,
math
x63
1949G
Scooter
graphs
,
greedy
x592
1949F
Dating
greedy
,
sortings
,
trees
x675
1949E
Damage per Second
brute force
,
math
x74
1949D
Funny or Scary?
constructive algorithms
x292
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
x1051
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
x1500
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
x75
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x558
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1042
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2467
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x7856
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x13799
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x19822
1948A
Special Characters
brute force
,
constructive algorithms
800
x25532
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x713
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x1961
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x3791
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x8611
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x17171
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x22712
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x451
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x587
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x3402
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x6608
1945D
Seraphim the Owl
dp
,
greedy
1300
x11508
1945C
Left and Right Houses
brute force
1200
x12190
1945B
Fireworks
math
,
number theory
900
x18771
1945A
Setting up Camp
greedy
,
math
800
x23610
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x13732
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x20446
1943F
Minimum Hamming Distance
dp
3500
x65
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x187
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x315
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x538
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1155
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1687
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3088
1943A
MEX Game 1
games
,
greedy
1300
x14622
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x52
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x336
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x505
1942E
Farm Game
combinatorics
,
games
2300
x1361
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2290
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5232
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x9038
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x11766
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x15018
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x2811
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5009
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