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Educational Codeforces Round 168 (Rated for Div. 2)
28:09:32
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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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Problems
#
Name
1877A
Goals of Victory
math
800
x21222
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x34130
1873C
Target Practice
implementation
,
math
800
x38099
1873B
Good Kid
brute force
,
greedy
,
math
800
x46767
1873A
Short Sort
brute force
,
implementation
800
x51653
1872A
Two Vessels
brute force
,
greedy
,
math
800
x38368
1870A
MEXanized Array
constructive algorithms
,
greedy
,
math
800
x18849
1867A
green_gold_dog, array and permutation
constructive algorithms
,
sortings
800
x19704
1866A
Ambitious Kid
math
800
x20101
1864A
Increasing and Decreasing
constructive algorithms
,
greedy
,
implementation
,
math
800
x20082
1863A
Channel
greedy
,
implementation
800
x17787
1862B
Sequence Game
constructive algorithms
800
x30539
1862A
Gift Carpet
dp
,
greedy
,
implementation
,
strings
800
x31873
1861A
Prime Deletion
constructive algorithms
,
math
800
x23601
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x30921
1858A
Buttons
games
,
greedy
,
math
800
x36466
1857A
Array Coloring
greedy
,
math
800
x45937
1856A
Tales of a Sort
implementation
800
x26189
1855A
Dalton the Teacher
greedy
,
math
800
x27629
1853A
Desorting
brute force
,
greedy
,
math
800
x30196
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x28852
1851A
Escalator Conversations
brute force
,
constructive algorithms
,
math
800
x29209
1850C
Word on the Paper
implementation
,
strings
800
x42896
1850B
Ten Words of Wisdom
implementation
,
sortings
800
x41857
1850A
To My Critics
implementation
,
sortings
800
x53726
1849A
Morning Sandwich
implementation
,
math
800
x27556
1847A
The Man who became a God
greedy
,
sortings
800
x21880
1846B
Rudolph and Tic-Tac-Toe
brute force
,
implementation
,
strings
800
x26593
1846A
Rudolph and Cut the Rope
implementation
,
math
800
x32122
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x26052
1844A
Subtraction Game
constructive algorithms
,
games
800
x24310
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x32237
1843B
Long Long
greedy
,
math
,
two pointers
800
x28619
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x33734
1842A
Tenzing and Tsondu
games
,
math
800
x19661
1841A
Game with Board
constructive algorithms
,
games
800
x24512
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x33520
1839A
The Good Array
greedy
,
implementation
,
math
800
x17293
1838A
Blackboard List
constructive algorithms
,
math
800
x21324
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x30908
1836A
Destroyer
implementation
,
sortings
800
x20091
1834A
Unit Array
greedy
,
math
800
x23028
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x25869
1833A
Musical Puzzle
implementation
,
strings
800
x32201
1832A
New Palindrome
strings
800
x25259
1831A
Twin Permutations
constructive algorithms
800
x25605
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x27916
1829B
Blank Space
implementation
800
x43411
1829A
Love Story
implementation
,
strings
800
x48594
1828A
Divisible Array
constructive algorithms
,
math
800
x23403
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x19494
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x15992
1822C
Bun Lover
math
800
x22677
1822B
Karina and Array
greedy
,
math
,
sortings
800
x24497
1822A
TubeTube Feed
brute force
,
implementation
800
x24010
1821A
Matching
combinatorics
,
math
800
x19631
1820A
Yura's New Name
implementation
,
strings
800
x16536
1818A
Politics
greedy
,
implementation
800
x12823
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x17148
1814A
Coins
implementation
,
math
800
x27207
1811A
Insert Digit
greedy
,
math
,
strings
800
x30623
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17340
1810A
Beautiful Sequence
brute force
,
greedy
800
x20586
1809A
Garland
implementation
800
x23698
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x29868
1807B
Grab the Candies
greedy
800
x40906
1807A
Plus or Minus
implementation
800
x58927
1806A
Walking Master
geometry
,
greedy
,
math
800
x23528
1805B
The String Has a Target
greedy
,
strings
800
x18404
1805A
We Need the Zero
bitmasks
,
brute force
800
x22290
1804A
Lame King
greedy
,
math
800
x17819
1802A
Likes
greedy
,
implementation
800
x15653
1800A
Is It a Cat?
implementation
,
strings
800
x30802
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11486
1798A
Showstopper
greedy
,
implementation
,
sortings
800
x19532
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x17207
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18708
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23454
1794A
Prefix and Suffix Array
strings
800
x16947
1793A
Yet Another Promotion
greedy
,
math
800
x17888
1792A
GamingForces
greedy
,
sortings
800
x27764
1791C
Prepend and Append
implementation
,
two pointers
800
x42967
1791B
Following Directions
geometry
,
implementation
800
x43106
1791A
Codeforces Checking
implementation
,
strings
800
x57911
1790B
Taisia and Dice
greedy
,
greedy
,
math
800
x27062
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x36437
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x16016
1789A
Serval and Mocha's Array
brute force
,
math
,
number theory
800
x17962
1788A
One and Two
brute force
,
implementation
,
math
800
x29047
1787A
Exponential Equation
constructive algorithms
,
math
800
x18974
1786A2
Alternating Deck (hard version)
implementation
800
x11316
1786A1
Non-alternating Deck (easy version)
implementation
800
x13707
1783A
Make it Beautiful
constructive algorithms
,
math
,
sortings
800
x28798
1781A
Parallel Projection
geometry
,
math
800
x14997
1780A
Hayato and School
constructive algorithms
,
greedy
800
x21331
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x23031
1778A
Flip Flop Sum
greedy
,
implementation
800
x23996
1777A
Everybody Likes Good Arrays!
greedy
,
math
800
x23096
1776A
Walking Boy
greedy
800
x6867
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x19502
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