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Before contest
Educational Codeforces Round 150 (Rated for Div. 2)
4 days
→ Filter Problems
Difficulty:
—
math
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
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
probabilities
x299
1840G1
In Search of Truth (Easy Version)
brute force
,
constructive algorithms
,
interactive
,
math
,
probabilities
x1030
1840C
Ski Resort
combinatorics
,
math
,
two pointers
x13673
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
x13066
1839A
The Good Array
greedy
,
implementation
,
math
x12497
1838E
Count Supersequences
combinatorics
,
dp
,
math
x628
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
x7932
1838B
Minimize Permutation Subarrays
constructive algorithms
,
math
x10932
1838A
Blackboard List
constructive algorithms
,
math
x15117
1837A
Grasshopper on a Line
constructive algorithms
,
math
x21492
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x4340
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x20741
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1326
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2109
1830E
Bully Sort
data structures
,
math
3500
x93
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x954
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x3011
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x4159
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x5753
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x10505
1828B
Permutation Swap
math
,
number theory
900
x15185
1828A
Divisible Array
constructive algorithms
,
math
800
x18740
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x13225
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x241
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x8946
1826B
Lunatic Never Content
math
,
number theory
1100
x11304
1825B
LuoTianyi and the Table
greedy
,
math
1000
x11418
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x1892
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x3183
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x471
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x920
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x2792
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x8771
1823B
Sort with Step
brute force
,
math
,
sortings
900
x12039
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x13385
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x1590
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x4424
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x6634
1822D
Super-Permutation
constructive algorithms
,
math
1200
x11855
1822C
Bun Lover
math
800
x18149
1822B
Karina and Array
greedy
,
math
,
sortings
800
x19473
1821F
Timber
combinatorics
,
dp
,
fft
,
math
2600
x505
1821D
Black Cells
binary search
,
brute force
,
greedy
,
math
1900
x3612
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x10026
1821A
Matching
combinatorics
,
math
800
x16208
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x10277
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x165
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1049
1817C
Similar Polynomials
combinatorics
,
math
2400
x730
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x132
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x178
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x720
1815A
Ian and Array Sorting
greedy
,
math
1300
x10671
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x622
1814B
Long Legs
brute force
,
math
1700
x7443
1814A
Coins
implementation
,
math
800
x20347
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1122
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x1350
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x8376
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x5304
1811B
Conveyor Belts
implementation
,
math
1000
x16567
1811A
Insert Digit
greedy
,
math
,
strings
800
x24612
1810H
Last Number
combinatorics
,
math
2900
x83
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x413
1810D
Climbing the Tree
binary search
,
math
1700
x5586
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x15227
1809G
Prediction
combinatorics
,
dp
,
math
2800
x266
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x610
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x9225
1809B
Points on Plane
binary search
,
greedy
,
math
1000
x16145
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x276
1808B
Playing in a Casino
math
,
sortings
1200
x10434
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x179
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x222
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x640
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x5791
1806A
Walking Master
geometry
,
greedy
,
math
800
x18523
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x222
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x540
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x9583
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x9373
1804A
Lame King
greedy
,
math
800
x16284
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x10975
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x400
1799G
Count Voting
combinatorics
,
dp
,
math
2600
x502
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x947
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x8769
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x10321
1798F
Gifts from Grandfather Ahmed
dp
,
math
,
number theory
2500
x344
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x6908
1798C
Candy Store
greedy
,
math
,
number theory
1700
x6413
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x867
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x115
1796C
Maximum Set
binary search
,
math
1600
x7530
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x1584
1795D
Triangle Coloring
combinatorics
,
math
1600
x6777
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x2692
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x9704
1794B
Not Dividing
constructive algorithms
,
greedy
,
math
900
x15027
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x4661
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