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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
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Difficulty:
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greedy
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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Custom test
Problems
#
Name
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x2348
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x8477
1956B
Nene and the Card Game
games
,
greedy
800
x15682
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x15886
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x4992
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x6060
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x15345
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1335
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x13131
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x17727
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x30
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x161
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x579
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2725
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x4312
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x8578
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x10894
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x15036
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x6887
1949H
Division Avoidance
greedy
,
math
x62
1949G
Scooter
graphs
,
greedy
x588
1949F
Dating
greedy
,
sortings
,
trees
x671
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
x1048
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
x1495
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2463
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x19796
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x3774
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x8584
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x17135
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x22675
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x6580
1945D
Seraphim the Owl
dp
,
greedy
1300
x11472
1945A
Setting up Camp
greedy
,
math
800
x23537
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x20398
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x185
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x314
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1681
1943A
MEX Game 1
games
,
greedy
1300
x14593
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2279
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5214
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x8998
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x4999
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x28934
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x25689
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x12728
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x395
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1029
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6381
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x359
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1121
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x6934
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1148
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x2975
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x5893
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x16199
1934A
Too Min Too Max
greedy
,
math
800
x22915
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x17345
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x34804
1932D
Card Game
greedy
,
implementation
1400
x9603
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x26125
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x13002
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x25586
1931B
Make Equal
greedy
800
x29589
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2318
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3614
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x6279
1930A
Maximise The Score
greedy
,
sortings
800
x16856
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1465
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x12981
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x23499
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x28520
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1492
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3663
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x14949
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1461
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3661
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x17903
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x25162
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x29872
1927A
Make it White
greedy
,
strings
800
x39153
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2851
1926D
Vlad and Division
bitmasks
,
greedy
1300
x13196
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x17990
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x26921
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x12096
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x312
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5712
1923C
Find B
constructive algorithms
,
greedy
1400
x12782
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x15876
1923A
Moving Chips
greedy
,
implementation
800
x22939
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x6925
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x16626
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x8756
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19747
1921C
Sending Messages
greedy
,
math
900
x26956
1921B
Arranging Cats
greedy
,
implementation
800
x31711
1921A
Square
greedy
,
math
800
x39454
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x19046
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x26275
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x726
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