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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
40:35:09
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Difficulty:
—
dp
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
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x14
1773L
Lisa's Sequences
dp
3500
x28
1170I
Good Subsets
*special problem
,
dp
x35
1910I
Inverse Problem
*special problem
,
combinatorics
,
dp
2700
x39
1297H
Paint the String
*special problem
,
dp
,
strings
x40
1431J
Zero-XOR Array
*special problem
,
dp
3400
x41
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x41
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x42
1346I
Pac-Man 2.0
*special problem
,
dp
2900
x43
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x52
1939D
Big Persimmon
*special problem
,
dp
,
games
x58
1776E
Crossing the Railways
data structures
,
dp
3500
x60
1776K
Uniform Chemistry
dp
,
math
3200
x63
1517H
Fly Around the World
dp
,
geometry
3500
x63
1943F
Minimum Hamming Distance
dp
3500
x64
1297G
M-numbers
*special problem
,
dp
,
math
x65
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x66
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x67
1874G
Jellyfish and Inscryption
dp
3500
x68
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x68
1863H
Goldberg Machine 3
dp
,
trees
3500
x69
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x69
1868E
Min-Sum-Max
constructive algorithms
,
dp
,
greedy
3500
x71
1750H
BinaryStringForces
constructive algorithms
,
data structures
,
dp
3500
x71
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x71
1909I
Short Permutation Problem
combinatorics
,
dp
,
fft
,
math
1900
x72
1545E1
AquaMoon and Time Stop (easy version)
data structures
,
dp
3500
x73
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
x75
1761F2
Anti-median (Hard Version)
combinatorics
,
dp
,
math
3500
x75
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x76
1545E2
AquaMoon and Time Stop (hard version)
data structures
,
dp
3500
x78
765G
Math, math everywhere
brute force
,
dp
,
math
,
meet-in-the-middle
,
number theory
3200
x79
1533H
Submatrices
*special problem
,
bitmasks
,
data structures
,
dp
x80
1349E
Slime and Hats
constructive algorithms
,
dp
,
greedy
3500
x80
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x83
1677F
Tokitsukaze and Gems
dp
,
math
3500
x85
1322F
Assigning Fares
dp
,
trees
3500
x87
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x88
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x91
1510H
Hard Optimization
dp
3200
x94
1852F
Panda Meetups
data structures
,
dp
,
flows
3500
x95
1266H
Red-Blue Graph
dp
,
graphs
,
math
,
matrices
,
meet-in-the-middle
3400
x98
774I
Composing Of String
*special problem
,
dp
2300
x100
1545F
AquaMoon and Potatoes
brute force
,
data structures
,
dp
3500
x101
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x102
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x103
1218A
BubbleReactor
dp
,
graphs
2800
x104
1842I
Tenzing and Necklace
divide and conquer
,
dp
,
greedy
3500
x106
1854F
Mark and Spaceship
brute force
,
dp
3500
x107
1349F2
Slime and Sequences (Hard Version)
dp
,
fft
,
math
3500
x107
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x108
336E
Vasily the Bear and Painting Square
bitmasks
,
combinatorics
,
dp
,
implementation
2700
x108
1237G
Balanced Distribution
data structures
,
dp
,
greedy
3500
x116
865E
Hex Dyslexia
bitmasks
,
brute force
,
dp
,
graphs
3300
x117
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x121
1387C
Viruses
*special problem
,
dp
,
shortest paths
,
string suffix structures
2900
x121
424E
Colored Jenga
dfs and similar
,
dp
,
probabilities
2500
x121
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x125
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x126
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x129
662E
To Hack or not to Hack
brute force
,
dp
,
greedy
3100
x129
185C
Clever Fat Rat
dp
2500
x129
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x131
717B
R3D3’s Summer Adventure
dp
,
greedy
2700
x135
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x136
1431G
Number Deletion Game
*special problem
,
dp
,
games
,
greedy
2100
x137
1707F
Bugaboo
bitmasks
,
constructive algorithms
,
dp
,
number theory
3500
x138
379G
New Year Cactus
dp
3100
x138
1530H
Turing's Award
data structures
,
dp
3400
x139
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x141
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x142
852H
Bob and stages
dp
,
geometry
3000
x142
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x149
756E
Byteland coins
combinatorics
,
dp
,
math
3200
x149
1874F
Jellyfish and OEIS
dp
3500
x150
1012F
Passports
dp
,
implementation
3400
x150
1210G
Mateusz and Escape Room
dp
3500
x155
924F
Minimal Subset Difference
dp
3200
x156
1007E
Mini Metro
dp
3400
x157
156E
Mrs. Hudson's Pancakes
brute force
,
dp
3000
x159
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x161
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x161
391F1
Stock Trading
dp
x161
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x162
1408I
Bitwise Magic
dp
,
math
3200
x163
1250D
Conference Problem
dp
3000
x164
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x167
1895G
Two Characters, Two Colors
binary search
,
data structures
,
dp
,
flows
,
greedy
3100
x167
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x167
1804H
Code Lock
bitmasks
,
dp
3300
x168
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x168
1585G
Poachers
dp
,
games
,
graphs
,
trees
2500
x168
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x168
1218C
Jumping Transformers
dp
2600
x170
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x175
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x179
933E
A Preponderant Reunion
constructive algorithms
,
dp
3200
x184
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x184
581E
Kojiro and Furrari
dp
,
greedy
2800
x185
980F
Cactus to Tree
dp
,
graphs
,
trees
2900
x189
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