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Educational Codeforces Round 189 (Rated for Div. 2)
2 days
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combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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
2218C
The 67th Permutation Problem
constructive algorithms
,
greedy
,
math
800
x24500
2218B
The 67th 6-7 Integer Problem
greedy
,
math
800
x30965
2218A
The 67th Integer Problem
brute force
,
games
,
implementation
,
math
800
x31920
2217A
The Equalizer
math
800
x20315
2211A
Antimedian Deletion
implementation
,
math
800
x15447
2210A
A Simple Sequence
constructive algorithms
,
dp
,
greedy
,
number theory
800
x21400
2209A
Flip Flops
greedy
800
x20872
2208A
Bingo Candies
constructive algorithms
,
math
800
x19565
2207A
1-1
greedy
,
strings
800
x13304
2205B
Simons and Cakes for Success
implementation
,
math
,
math
800
x15750
2205A
Simons and Making It Beautiful
brute force
,
constructive algorithms
,
constructive algorithms
,
constructive algorithms
,
constructive algorithms
,
constructive algorithms
,
constructive algorithms
800
x16926
2204B
Right Maximum
greedy
800
x18958
2204A
Passing the Ball
brute force
,
implementation
800
x21194
2203A
Towers of Boxes
math
800
x17501
2202A
Parkour Design
math
,
math
,
math
,
math
800
x16105
2200B
Deletion Sort
bitmasks
,
brute force
,
greedy
,
sortings
800
x24628
2200A
Eating Game
greedy
800
x27146
2197A
Friendly Numbers
binary search
,
brute force
,
expression parsing
,
math
,
schedules
800
x22616
2195A
Sieve of Erato67henes
math
,
number theory
800
x34872
2194A
Lawn Mower
greedy
,
math
800
x23569
2193B
Reverse a Permutation
greedy
800
x29899
2193A
DBMB and the Array
brute force
,
math
800
x42325
2192A
String Rotation Game
brute force
,
strings
800
x17699
2191A
Array Coloring
constructive algorithms
800
x27584
2189A
Table with Numbers
greedy
,
implementation
800
x24237
2188A
Divisible Permutation
constructive algorithms
800
x25729
2185B
Prefix Max
greedy
800
x40149
2185A
Perfect Root
constructive algorithms
,
math
800
x42495
2184A
Social Experiment
math
800
x37725
2183A
Binary Array Game
games
800
x23572
2182B
New Year Cake
brute force
800
x23294
2182A
New Year String
constructive algorithms
,
greedy
,
implementation
,
strings
800
x25165
2180B
Ashmal
greedy
,
strings
800
x24459
2180A
Carnival Wheel
brute force
,
number theory
800
x25768
2179B
Blackslex and Showering
dp
,
greedy
,
implementation
800
x28171
2179A
Blackslex and Password
math
,
strings
800
x34209
2178A
Yes or Yes
greedy
,
strings
800
x25521
2176A
Operations with Inversions
greedy
,
implementation
,
math
800
x28897
2175A
Little Fairy's Painting
implementation
800
x18601
2173A
Sleeping Through Classes
greedy
,
implementation
800
x23633
2172A
ASCII Art Contest
implementation
800
x14410
2171A
Shizuku Hoshikawa and Farm Legs
brute force
,
math
800
x36996
2170A
Maximum Neighborhood
bitmasks
,
brute force
,
greedy
,
implementation
,
math
800
x19775
2167C
Isamatdin and His Magic Wand!
constructive algorithms
,
greedy
,
implementation
,
sortings
800
x35829
2167B
Your Name
sortings
,
strings
800
x51331
2167A
Square?
math
,
sortings
800
x57761
2166A
Same Difference
brute force
,
greedy
,
strings
800
x22761
2164A
Sequence Game
brute force
,
sortings
800
x20697
2163A
Souvlaki VS. Kalamaki
brute force
,
greedy
,
math
,
sortings
800
x19496
2162A
Beautiful Average
brute force
,
greedy
800
x41341
2161A
Round Trip
games
,
greedy
,
implementation
,
math
800
x15659
2160A
MEX Partition
math
800
x22360
2158A
Suspension
constructive algorithms
,
greedy
,
math
800
x23231
2157A
Dungeon Equilibrium
greedy
,
implementation
,
sortings
800
x16382
2156A
Pizza Time
brute force
,
constructive algorithms
,
greedy
800
x26726
2155A
El fucho
implementation
,
math
800
x25073
2154A
Notelock
greedy
,
two pointers
800
x23052
2153B
Bitwise Reversion
bitmasks
,
greedy
800
x22511
2153A
Circle of Apple Trees
greedy
,
sortings
800
x26282
2152A
Increase or Smash
greedy
,
implementation
800
x22228
2151A
Incremental Subarray
math
,
strings
800
x17904
2149B
Unconventional Pairs
greedy
,
sortings
800
x32897
2149A
Be Positive
math
800
x40675
2148B
Lasers
geometry
800
x32867
2148A
Sublime Sequence
brute force
,
hashing
,
math
800
x47027
2147A
Shortest Increasing Path
constructive algorithms
,
greedy
800
x18554
2146A
Equal Occurrences
brute force
,
greedy
,
implementation
800
x21749
2145A
Candies for Nephews
math
800
x30595
2144A
Cut the Array
brute force
,
constructive algorithms
,
math
,
number theory
800
x21619
2143A
All Lengths Subtraction
brute force
,
two pointers
800
x20642
2141A
Furniture Store
*special problem
,
implementation
800
x1599
2140A
Shift Sort
greedy
,
sortings
800
x22184
2139B
Cake Collection
greedy
800
x20763
2139A
Maple and Multiplication
greedy
,
math
800
x25738
2137A
Collatz Conjecture
constructive algorithms
,
math
800
x35150
2136A
In the Dream
greedy
,
math
800
x26024
2134A
Painting With Two Colors
constructive algorithms
,
implementation
,
math
800
x26476
2133B
Villagers
greedy
800
x25459
2133A
Redstone?
brute force
,
data structures
,
implementation
,
math
800
x30863
2132A
Homework
brute force
,
implementation
,
strings
800
x43136
2131B
Alternating Series
constructive algorithms
,
greedy
,
math
800
x30853
2131A
Lever
math
800
x38730
2130A
Submission is All You Need
greedy
,
math
800
x28460
2128A
Recycling Center
greedy
,
sortings
800
x28424
2127A
Mix Mex Max
constructive algorithms
,
greedy
,
math
800
x19579
2126B
No Casino in the Mountains
dp
,
greedy
800
x37522
2126A
Only One Digit
brute force
,
implementation
,
math
800
x50813
2125A
Difficult Contest
constructive algorithms
,
implementation
,
sortings
,
strings
800
x27887
2124A
Deranged Deletions
greedy
,
sortings
800
x19139
2123B
Tournament
greedy
800
x34766
2123A
Blackboard Game
math
800
x41514
2122A
Greedy Grid
constructive algorithms
,
greedy
800
x19147
2121B
Above the Clouds
constructive algorithms
,
greedy
,
strings
800
x32429
2121A
Letter Home
brute force
,
math
800
x39142
2120A
Square of Rectangles
geometry
,
math
800
x20222
2119A
Add or XOR
bitmasks
,
greedy
,
math
800
x27053
2118A
Equal Subsequences
constructive algorithms
,
greedy
800
x29035
2117B
Shrink
constructive algorithms
800
x32060
2117A
False Alarm
greedy
,
implementation
800
x37853
2116A
Gellyfish and Tricolor Pansy
games
,
greedy
800
x26865
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