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Educational Codeforces Round 168 (Rated for Div. 2)
28:20:28
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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
1774A
Add Plus Minus Sign
constructive algorithms
,
math
800
x22259
1773F
Football
constructive algorithms
800
x4028
1772B
Matrix Rotation
brute force
,
implementation
800
x28782
1772A
A+B?
implementation
800
x45970
1769A
Узкая дорога
*special problem
,
math
800
x1928
1768A
Greatest Convex
greedy
,
math
,
number theory
800
x28506
1767B
Block Towers
data structures
,
greedy
,
sortings
800
x20120
1767A
Cut the Triangle
implementation
800
x20356
1766A
Extremely Round
brute force
,
implementation
800
x25278
1765B
Broken Keyboard
greedy
800
x8858
1764A
Doremy's Paint
greedy
800
x16497
1763A
Absolute Maximization
bitmasks
,
constructive algorithms
,
greedy
,
math
800
x15553
1762A
Divide and Conquer
greedy
,
math
,
number theory
800
x18849
1761A
Two Permutations
brute force
,
constructive algorithms
800
x18542
1760C
Advantage
data structures
,
implementation
,
sortings
800
x36187
1760B
Atilla's Favorite Problem
greedy
,
implementation
,
strings
800
x43356
1760A
Medium Number
implementation
,
sortings
800
x56787
1759B
Lost Permutation
math
800
x22024
1759A
Yes-Yes?
implementation
,
strings
800
x29522
1758A
SSeeeeiinngg DDoouubbllee
constructive algorithms
,
strings
800
x24947
1754B
Kevin and Permutation
constructive algorithms
,
greedy
,
math
800
x18790
1754A
Technical Support
greedy
800
x22962
1750B
Maximum Substring
brute force
,
greedy
,
implementation
800
x16143
1750A
Indirect Sort
constructive algorithms
,
implementation
,
math
800
x16959
1749A
Cowardly Rooks
greedy
,
implementation
800
x22211
1748A
The Ultimate Square
math
800
x23858
1747A
Two Groups
constructive algorithms
,
greedy
800
x24679
1746B
Rebellion
constructive algorithms
,
greedy
,
two pointers
800
x17020
1746A
Maxmina
constructive algorithms
,
greedy
800
x19723
1744B
Even-Odd Increments
implementation
,
math
800
x23256
1744A
Number Replacement
greedy
,
implementation
800
x26877
1743B
Permutation Value
constructive algorithms
,
greedy
800
x22083
1743A
Password
brute force
,
combinatorics
,
implementation
,
math
800
x26513
1742B
Increasing
greedy
,
implementation
,
sortings
800
x46255
1742A
Sum
implementation
800
x68258
1741B
Funny Permutation
constructive algorithms
,
math
800
x25157
1741A
Compare T-Shirt Sizes
implementation
,
implementation
,
strings
800
x30429
1740B
Jumbo Extra Cheese 2
geometry
,
greedy
,
sortings
800
x13680
1740A
Factorise N+M
constructive algorithms
,
number theory
800
x19931
1739A
Immobile Knight
implementation
800
x22490
1738A
Glory Addicts
greedy
,
implementation
,
sortings
800
x13456
1736A
Make A Equal to B
brute force
,
greedy
,
sortings
800
x22619
1735A
Working Week
constructive algorithms
,
greedy
,
math
800
x20068
1734B
Bright, Nice, Brilliant
constructive algorithms
800
x15685
1734A
Select Three Sticks
brute force
,
greedy
,
sortings
800
x20961
1733A
Consecutive Sum
greedy
,
sortings
800
x20802
1731A
Joey Takes Money
greedy
,
math
800
x22348
1730A
Planets
data structures
,
greedy
,
sortings
800
x22764
1729B
Decode String
greedy
,
strings
800
x29811
1729A
Two Elevators
math
800
x39761
1728B
Best Permutation
constructive algorithms
,
greedy
800
x20032
1728A
Colored Balls: Revisited
brute force
,
greedy
,
implementation
,
sortings
800
x24498
1725A
Accumulation of Dominoes
math
800
x9170
1722C
Word Game
data structures
,
implementation
800
x30271
1722B
Colourblindness
implementation
800
x44628
1722A
Spell Check
implementation
800
x48874
1721A
Image
greedy
,
implementation
800
x26833
1720B
Interesting Sum
brute force
,
data structures
,
greedy
,
math
,
sortings
800
x20943
1719B
Mathematical Circus
constructive algorithms
,
math
800
x18406
1719A
Chip Game
games
,
math
800
x25253
1717A
Madoka and Strange Thoughts
math
,
number theory
800
x19313
1716B
Permutation Chain
constructive algorithms
,
math
800
x21318
1716A
2-3 Moves
greedy
,
math
800
x32383
1715A
Crossmarket
constructive algorithms
,
greedy
,
math
800
x23355
1714C
Minimum Varied Number
greedy
800
x30685
1714B
Remove Prefix
data structures
,
greedy
,
implementation
800
x29888
1713A
Traveling Salesman Problem
geometry
,
greedy
,
implementation
800
x21795
1712B
Woeful Permutation
constructive algorithms
,
greedy
,
number theory
800
x21423
1712A
Wonderful Permutation
greedy
,
implementation
800
x23896
1711A
Perfect Permutation
constructive algorithms
800
x24985
1709A
Three Doors
brute force
,
greedy
,
implementation
,
math
800
x29353
1708A
Difference Operations
greedy
,
math
800
x21604
1706A
Another String Minimization Problem
2-sat
,
constructive algorithms
,
greedy
,
string suffix structures
,
strings
800
x22728
1705A
Mark the Photographer
greedy
,
sortings
800
x24990
1704A
Two 0-1 Sequences
constructive algorithms
,
greedy
800
x15905
1703C
Cypher
brute force
,
implementation
,
strings
800
x34918
1703B
ICPC Balloons
data structures
,
implementation
800
x47422
1703A
YES or YES?
brute force
,
implementation
,
strings
800
x66086
1702B
Polycarp Writes a String from Memory
greedy
800
x27340
1702A
Round Down the Price
constructive algorithms
800
x34206
1701B
Permutation
greedy
800
x20092
1701A
Grass Field
implementation
800
x26044
1700A
Optimal Path
constructive algorithms
,
greedy
,
math
800
x22728
1699A
The Third Three Number Problem
constructive algorithms
,
math
800
x23832
1698B
Rising Sand
constructive algorithms
,
greedy
,
implementation
800
x20826
1698A
XOR Mixup
bitmasks
,
brute force
800
x28559
1697A
Parkway Walk
greedy
,
implementation
800
x25589
1696A
NIT orz!
bitmasks
,
greedy
800
x18605
1695A
Subrectangle Guess
games
800
x16241
1694A
Creep
greedy
,
implementation
800
x22340
1692C
Where's the Bishop?
implementation
800
x33266
1692B
All Distinct
greedy
,
sortings
800
x33530
1692A
Marathon
implementation
800
x62610
1691A
Beat The Odds
brute force
,
greedy
,
math
800
x30222
1690C
Restoring the Duration of Tasks
data structures
,
greedy
,
implementation
800
x25791
1690B
Array Decrements
greedy
,
implementation
800
x25051
1690A
Print a Pedestal (Codeforces logo?)
constructive algorithms
,
greedy
800
x33035
1689A
Lex String
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
800
x16508
1688B
Patchouli's Magical Talisman
bitmasks
,
constructive algorithms
,
greedy
,
sortings
800
x18081
1688A
Cirno's Perfect Bitmasks Classroom
bitmasks
,
brute force
800
x21289
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