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Codeforces Round 1123 (Div. 2)
03:50:48
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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
2264B
Knife's Pill Farm
data structures
,
greedy
,
math
1000
x10111
2264A
Rumb Needs a Hand
implementation
,
implementation
,
implementation
,
sortings
,
sortings
,
sortings
,
two pointers
,
two pointers
,
two pointers
800
x13979
2263B
Min Matrices
constructive algorithms
,
constructive algorithms
,
constructive algorithms
,
constructive algorithms
,
constructive algorithms
900
x12204
2263A
Min Max Game
games
800
x16044
2262A1
Floor of MEX (Easy Version)
constructive algorithms
,
greedy
1200
x9047
2260B
Monocarp and Projects
brute force
,
math
,
number theory
900
x14996
2260A
Monocarp's Contest
implementation
800
x19356
2259D
MEX Multiset
constructive algorithms
,
greedy
1200
x13047
2259C
101
constructive algorithms
,
greedy
1000
x17823
2259B
Minus Two
math
,
number theory
,
number theory
,
number theory
,
number theory
,
number theory
800
x23812
2259A
Moo Language School
brute force
,
greedy
,
greedy
,
greedy
,
greedy
,
two pointers
800
x26855
2258B1
Carrot Chopdown (Easy Version)
brute force
,
games
,
math
900
x15309
2258A
Odd Eraser
math
800
x18998
2257C
Spying on the Beaver
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1200
x11993
2257B
Gigantomachy
math
,
math
800
x18955
2257A
Creating Abbreviations
brute force
,
strings
800
x20762
2256B
Domino Tiles
implementation
,
math
1000
x16963
2256A
Three Numbers on the Blackboard
math
,
math
,
math
,
math
,
sortings
800
x25406
2255A
Hot Potatoes at the Fairy Warehouse
games
,
greedy
,
implementation
1200
x13868
2254C2
Marenol (hard version)
greedy
,
sortings
1200
x14333
2254C1
Marenol (easy version)
greedy
1000
x20234
2254B
Evanescent
implementation
,
strings
,
two pointers
900
x25483
2254A
Riptide
implementation
,
sortings
800
x36601
2253B
Hypercarp and the Control Panel
brute force
,
data structures
,
two pointers
1100
x12433
2253A
The Best Card
greedy
,
math
,
number theory
800
x21354
2252B
Always Changing
dp
,
greedy
,
math
,
strings
1100
x12973
2252A
Boss Fight
data structures
,
greedy
,
greedy
800
x18861
2250B
String Construction
constructive algorithms
,
constructive algorithms
1000
x15193
2250A
Threshold Movement
brute force
,
implementation
,
math
800
x19156
2248B
Merge to Match
greedy
,
sortings
1000
x14997
2248A
You Delete, I Delete
greedy
800
x20863
2247C
Inversion of a Subsequence
greedy
,
math
1100
x13426
2247B
Yet Another Constructive
constructive algorithms
900
x16476
2247A
Zero Sum
constructive algorithms
,
dp
,
number theory
800
x22697
2246B
ezraft and Array
constructive algorithms
,
number theory
900
x17628
2246A
farmpiggie and Subset Sum
constructive algorithms
800
x19893
2245B
Delete and Concatenate
greedy
1100
x11117
2245A
Who Watches the Watchpig?
greedy
800
x14223
2244D
Yaroslav and Productivity
constructive algorithms
,
dp
,
greedy
,
math
,
number theory
1200
x13797
2244C
Stepan and Permutation
constructive algorithms
,
dfs and similar
,
dsu
,
greedy
,
math
,
number theory
,
sortings
,
sortings
,
sortings
1100
x18050
2244B
Nikita and Books
greedy
,
greedy
,
math
,
math
,
sortings
,
sortings
800
x25226
2244A
Iskander and Drawings
dp
,
games
,
greedy
,
strings
800
x30655
2242B
Predominant Frequency Division
data structures
,
greedy
,
implementation
,
math
1000
x17999
2242A
Bigrams
sortings
,
strings
800
x25244
2241D
An Alternative Way
dp
,
greedy
,
math
1100
x16972
2241C
RemovevomeR
greedy
1000
x22232
2241B
Good times Good times
constructive algorithms
,
dfs and similar
,
math
1100
x21625
2241A
Divide and Conquer
greedy
,
math
,
number theory
800
x35471
2240B
AI Finds Nothing Here
combinatorics
,
math
1100
x11313
2240A
Another Popcount Problem
greedy
800
x17290
2238B
Crimson Triples
dp
,
math
,
number theory
900
x16722
2238A
Another Puzzle from Papyrus
greedy
,
math
,
sortings
800
x20312
2237C
Duck Surplus
binary search
,
greedy
1000
x16559
2237B
Annoying the Ghost
brute force
,
greedy
1000
x15350
2237A
Destroying Towers
games
,
greedy
,
schedules
800
x22403
2236C
Omsk Programmers
brute force
,
greedy
,
greedy
,
math
,
math
1000
x21880
2236B
Tatar TV Show
greedy
,
math
,
strings
800
x29389
2236A
Games on the Train
greedy
,
math
800
x35912
2234C
Vessels, Heights and Two Versions (Easy Version)
dfs and similar
,
dsu
,
greedy
,
implementation
,
two pointers
1200
x12631
2234B
Palindrome, Twelve and Two Terms
brute force
,
constructive algorithms
,
math
800
x22831
2234A
Euclid, Sequence and Two Numbers
math
,
number theory
,
sortings
800
x24856
2233B
Different Distances
constructive algorithms
900
x18591
2233A
AI Project Development
brute force
,
math
800
x23602
2232B
Cake Leveling
binary search
,
greedy
,
math
900
x21732
2232A
Convergence
greedy
,
sortings
,
sortings
,
sortings
800
x23820
2231B
Another Sorting Problem
constructive algorithms
1100
x18658
2231A
Construct an Array
constructive algorithms
800
x26109
2230B
Digit String
greedy
,
implementation
,
math
1000
x17823
2230A
Optimal Purchase
implementation
,
math
800
x24163
2229C1
We Be Flipping (Easy Version)
constructive algorithms
,
greedy
900
x16404
2229B
Absolute Cinema
greedy
,
math
800
x19032
2229A
Slimes on a Line
brute force
,
greedy
,
math
800
x19132
2228B
Remilia Plays Soku
games
,
implementation
1100
x17598
2228A
Marisa Steals Reimu's Takeout
greedy
,
implementation
800
x22385
2227D
Palindromex
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
two pointers
1200
x14921
2227C
Snowfall
constructive algorithms
,
math
800
x23814
2227B
Party Monster
greedy
800
x28875
2227A
Koshary
implementation
,
math
800
x32863
2226B
Everything Everywhere
greedy
,
math
,
math
,
number theory
,
number theory
900
x15383
2226A
Disturbing Distribution
greedy
,
math
800
x16056
2225C
Red-Black Pairs
dp
,
greedy
1100
x14677
2225B
Alternating String
brute force
,
greedy
900
x17971
2225A
A Number Between Two Others
greedy
,
math
800
x22410
2224B
Zhily and Mex and Max
constructive algorithms
,
greedy
,
math
,
sortings
1200
x9705
2224A
Zhily and Array Operating
constructive algorithms
,
greedy
800
x12407
2222B
Artistic Balance Tree
greedy
,
sortings
1100
x9351
2222A
A Wonderful Contest
brute force
,
dp
,
math
800
x12740
2220B
OIE Excursion
greedy
1200
x15296
2220A
Blocked
greedy
,
sortings
800
x21772
2218E
The 67th XOR Problem
binary search
,
bitmasks
,
brute force
1200
x18122
2218D
The 67th OEIS Problem
constructive algorithms
,
greedy
,
greedy
,
greedy
,
math
,
math
,
number theory
1100
x22606
2218C
The 67th Permutation Problem
constructive algorithms
,
greedy
,
math
800
x32201
2218B
The 67th 6-7 Integer Problem
greedy
,
math
800
x42294
2218A
The 67th Integer Problem
brute force
,
games
,
implementation
,
math
800
x44703
2217B
Flip the Bit (Easy Version)
greedy
,
implementation
1000
x18958
2217A
The Equalizer
math
800
x25622
2216A
Course Wishes
greedy
900
x6562
2211B
Mickey Mouse Constructive
constructive algorithms
,
dp
,
greedy
,
math
1100
x13324
2211A
Antimedian Deletion
implementation
,
math
800
x18126
2210C1
A Simple GCD Problem (Easy Version)
greedy
,
number theory
1200
x15048
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