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Before contest
Educational Codeforces Round 169 (Rated for Div. 2)
19:09:46
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Difficulty:
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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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Custom test
Problems
#
Name
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x12066
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7347
1810D
Climbing the Tree
binary search
,
math
1700
x7337
1810C
Make It Permutation
brute force
,
greedy
,
sortings
1300
x14301
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x12505
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x6128
1807E
Interview
binary search
,
implementation
,
interactive
1300
x12516
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7472
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x12352
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11909
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8428
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12560
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12602
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x5714
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x9601
1798C
Candy Store
greedy
,
math
,
number theory
1700
x8053
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7488
1796C
Maximum Set
binary search
,
math
1600
x10210
1795D
Triangle Coloring
combinatorics
,
math
1600
x8923
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x12090
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x13339
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x6164
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13862
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x12146
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x14856
1789C
Serval and Toxel's Arrays
combinatorics
,
dp
,
implementation
,
math
1500
x8402
1788C
Matching Numbers
constructive algorithms
,
greedy
,
math
1300
x16952
1787C
Remove the Bracket
dp
,
greedy
,
math
1600
x6975
1786B
Cake Assembly Line
brute force
,
sortings
1300
x8862
1783C
Yet Another Tournament
binary search
,
greedy
,
sortings
1700
x9165
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7445
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7776
1779C
Least Prefix Sum
data structures
,
greedy
1600
x12231
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x8037
1778B
The Forbidden Permutation
greedy
,
math
1300
x13159
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x8340
1776L
Controllers
binary search
,
math
1500
x5739
1776H
Beppa and SwerChat
two pointers
1300
x6266
1776F
Train Splitting
constructive algorithms
,
graphs
,
greedy
1700
x3374
1775C
Interesting Sequence
bitmasks
,
math
1600
x10207
1775B
Gardener and the Array
bitmasks
,
constructive algorithms
1300
x13480
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7725
1774C
Ice and Fire
constructive algorithms
,
dp
,
greedy
1300
x11867
1774B
Coloring
constructive algorithms
,
greedy
,
math
1500
x12055
1773E
Easy Assembly
greedy
,
sortings
1400
x4788
1772E
Permutation Game
games
1700
x6662
1772D
Absolute Sorting
constructive algorithms
,
math
1400
x15604
1771C
Hossam and Trainees
greedy
,
math
,
number theory
1600
x9478
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x13887
1770C
Koxia and Number Theory
brute force
,
chinese remainder theorem
,
math
,
number theory
1700
x8462
1769C2
Подкрутка II
*special problem
,
dp
1300
x946
1769B2
Копирование файлов II
*special problem
,
binary search
,
brute force
,
math
1400
x866
1768C
Elemental Decompress
constructive algorithms
,
greedy
,
implementation
,
sortings
1300
x14002
1767D
Playoff
combinatorics
,
constructive algorithms
,
dp
,
greedy
,
math
1500
x9746
1766D
Lucky Chains
math
,
number theory
1600
x8758
1766C
Hamiltonian Wall
dp
,
implementation
1300
x13461
1765N
Number Reduction
greedy
1500
x4657
1765K
Torus Path
greedy
,
math
1500
x5612
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x4075
1764C
Doremy's City Construction
graphs
,
greedy
1400
x9291
1762C
Binary Strings are Fun
combinatorics
,
math
1400
x9076
1761C
Set Construction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1400
x9479
1760G
SlavicG's Favorite Problem
bitmasks
,
dfs and similar
,
graphs
1700
x7215
1760F
Quests
binary search
,
greedy
,
sortings
1500
x11942
1759E
The Humanoid
brute force
,
dp
,
sortings
1500
x10593
1759D
Make It Round
brute force
,
number theory
1400
x13176
1758C
Almost All Multiples
greedy
,
number theory
1400
x13406
1753B
Factorial Divisibility
math
,
number theory
1600
x12545
1753A2
Make Nonzero Sum (hard version)
constructive algorithms
,
dp
,
greedy
1500
x10153
1753A1
Make Nonzero Sum (easy version)
constructive algorithms
,
dp
,
greedy
1300
x14720
1750C
Complementary XOR
constructive algorithms
,
implementation
1400
x9466
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x13772
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x10922
1748B
Diverse Substrings
brute force
,
implementation
,
strings
1400
x14885
1746C
Permutation Operations
constructive algorithms
,
greedy
,
implementation
,
math
1300
x12675
1744E1
Divisible Numbers (easy version)
brute force
,
math
,
number theory
1500
x10701
1743D
Problem with Random Tests
brute force
,
dp
,
greedy
,
probabilities
1700
x7515
1742G
Orray
bitmasks
,
brute force
,
greedy
,
math
,
sortings
1500
x10441
1742F
Smaller
constructive algorithms
,
greedy
,
strings
1500
x11407
1741E
Sending a Sequence Over the Network
dp
1600
x11678
1741D
Masha and a Beautiful Tree
dfs and similar
,
divide and conquer
,
graphs
,
sortings
,
trees
1300
x14989
1740D
Knowledge Cards
constructive algorithms
,
data structures
1500
x7985
1740C
Bricks and Bags
constructive algorithms
,
games
,
greedy
,
sortings
1400
x10903
1739C
Card Game
combinatorics
,
constructive algorithms
,
dp
,
games
1500
x8970
1738C
Even Number Addicts
dp
,
games
,
greedy
,
math
1500
x11017
1737C
Ela and Crickets
constructive algorithms
,
games
,
implementation
,
math
1500
x5698
1737B
Ela's Fitness and the Luxury Number
binary search
,
implementation
,
math
1300
x9334
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14867
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5428
1735C
Phase Shift
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
1400
x9782
1733D1
Zero-One (Easy Version)
constructive algorithms
,
greedy
,
math
1400
x13266
1733C
Parity Shuffle Sorting
constructive algorithms
,
sortings
1300
x15436
1732D1
Balance (Easy version)
brute force
,
data structures
,
implementation
,
number theory
1500
x8565
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x7003
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x9347
1730B
Meeting on the Line
binary search
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
1600
x12417
1728C
Digital Logarithm
data structures
,
greedy
,
sortings
1400
x15692
1726C
Jatayu's Balanced Bracket Sequence
data structures
,
dsu
,
graphs
,
greedy
1300
x12244
1725G
Garage
binary search
,
geometry
,
math
1500
x5779
1722G
Even-Odd XOR
bitmasks
,
constructive algorithms
,
greedy
1500
x11005
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