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Educational Codeforces Round 165 (Rated for Div. 2)
33:24:53
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Difficulty:
—
sortings
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
155B
Combination
greedy
,
sortings
1100
x10003
785B
Anton and Classes
greedy
,
sortings
1100
x10125
558A
Lala Land and Apple Trees
brute force
,
implementation
,
sortings
1100
x10160
755B
PolandBall and Game
binary search
,
data structures
,
games
,
greedy
,
sortings
,
strings
1100
x10908
721B
Passwords
implementation
,
math
,
sortings
,
strings
1100
x11965
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x12715
362B
Petya and Staircases
implementation
,
sortings
1100
x13490
160B
Unlucky Ticket
greedy
,
sortings
1100
x13554
1189B
Number Circle
greedy
,
math
,
sortings
1100
x13646
1566D1
Seating Arrangements (easy version)
data structures
,
greedy
,
sortings
1100
x13748
1623B
Game on Ranges
brute force
,
dfs and similar
,
implementation
,
sortings
1100
x13891
1869B
2D Traveling
geometry
,
math
,
shortest paths
,
sortings
1100
x14306
1417B
Two Arrays
greedy
,
math
,
sortings
1100
x14322
1839B
Lamps
greedy
,
sortings
1100
x14447
1863B
Split Sort
greedy
,
math
,
sortings
1100
x14531
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x14723
242B
Big Segment
implementation
,
sortings
1100
x15180
1891B
Deja Vu
brute force
,
math
,
sortings
1100
x15618
1625B
Elementary Particles
brute force
,
greedy
,
sortings
1100
x15848
1762B
Make Array Good
constructive algorithms
,
implementation
,
number theory
,
sortings
1100
x16158
1685A
Circular Local MiniMax
constructive algorithms
,
greedy
,
sortings
1100
x16450
166A
Rank List
binary search
,
implementation
,
sortings
1100
x16725
1682B
AND Sorting
bitmasks
,
constructive algorithms
,
sortings
1100
x17106
1015C
Songs Compression
sortings
1100
x17280
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17388
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x17605
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x17783
1579B
Shifting Sort
implementation
,
sortings
1100
x17790
988B
Substrings Sort
sortings
,
strings
1100
x17815
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x19129
1712C
Sort Zero
greedy
,
sortings
1100
x19188
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x19515
1862C
Flower City Fence
binary search
,
data structures
,
implementation
,
sortings
1100
x19565
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19848
1529B
Sifid and Strange Subsequences
greedy
,
math
,
sortings
1100
x20321
1638B
Odd Swap Sort
data structures
,
math
,
sortings
1100
x20374
1791G1
Teleporters (Easy Version)
greedy
,
sortings
1100
x20391
1722D
Line
greedy
,
sortings
1100
x22159
1873E
Building an Aquarium
binary search
,
sortings
1100
x22690
1557B
Moamen and k-subarrays
greedy
,
sortings
1100
x22781
1676E
Eating Queries
binary search
,
greedy
,
sortings
1100
x24531
1334B
Middle Class
greedy
,
sortings
1100
x25140
1791E
Negatives and Positives
dp
,
greedy
,
sortings
1100
x25429
1360C
Similar Pairs
constructive algorithms
,
graph matchings
,
greedy
,
sortings
1100
x31637
1335C
Two Teams Composing
binary search
,
greedy
,
implementation
,
sortings
1100
x33189
519B
A and B and Compilation Errors
data structures
,
implementation
,
sortings
1100
x37620
456A
Laptops
sortings
1100
x45238
981B
Businessmen Problems
sortings
1000
x6749
967B
Watering System
math
,
sortings
1000
x6821
234B
Reading
sortings
1000
x6968
299A
Ksusha and Array
brute force
,
number theory
,
sortings
1000
x7718
909A
Generate Login
brute force
,
greedy
,
sortings
1000
x9131
652B
z-sort
sortings
1000
x9820
1008B
Turn the Rectangles
greedy
,
sortings
1000
x11239
864A
Fair Game
implementation
,
sortings
1000
x11526
1725B
Basketball Together
binary search
,
greedy
,
sortings
1000
x11590
1088B
Ehab and subtraction
implementation
,
sortings
1000
x12342
157B
Trace
geometry
,
sortings
1000
x12834
1781B
Going to the Cinema
brute force
,
greedy
,
sortings
1000
x13202
1155A
Reverse a Substring
implementation
,
sortings
,
strings
1000
x13423
1117B
Emotes
greedy
,
math
,
sortings
1000
x13673
1876A
Helmets in Night Light
greedy
,
sortings
1000
x14655
1144C
Two Shuffled Sequences
constructive algorithms
,
sortings
1000
x14794
560A
Currency System in Geraldion
implementation
,
sortings
1000
x16811
507A
Amr and Music
greedy
,
implementation
,
sortings
1000
x16967
1174A
Ehab Fails to Be Thanos
constructive algorithms
,
greedy
,
sortings
1000
x17175
1605B
Reverse Sort
greedy
,
sortings
1000
x17616
1614B
Divan and a New Project
constructive algorithms
,
sortings
1000
x17809
1671B
Consecutive Points Segment
brute force
,
math
,
sortings
1000
x18094
1438B
Valerii Against Everyone
constructive algorithms
,
data structures
,
greedy
,
sortings
1000
x18370
1165B
Polycarp Training
data structures
,
greedy
,
sortings
1000
x20291
1622B
Berland Music
data structures
,
greedy
,
math
,
sortings
1000
x20515
1713B
Optimal Reduction
constructive algorithms
,
sortings
1000
x20707
1613B
Absent Remainder
greedy
,
implementation
,
sortings
1000
x21153
1300B
Assigning to Classes
greedy
,
implementation
,
sortings
1000
x22184
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x22434
1849B
Monsters
greedy
,
math
,
sortings
1000
x22520
37A
Towers
sortings
1000
x23523
1419D1
Sage's Birthday (easy version)
binary search
,
constructive algorithms
,
greedy
,
sortings
1000
x23547
1859B
Olya and Game with Arrays
constructive algorithms
,
greedy
,
math
,
sortings
1000
x24122
1607C
Minimum Extraction
brute force
,
sortings
1000
x24277
1312B
Bogosort
constructive algorithms
,
sortings
1000
x24518
1358B
Maria Breaks the Self-isolation
greedy
,
sortings
1000
x24578
766B
Mahmoud and a Triangle
constructive algorithms
,
geometry
,
greedy
,
math
,
number theory
,
sortings
1000
x31015
230A
Dragons
greedy
,
sortings
1000
x74078
412B
Network Configuration
greedy
,
sortings
900
x5260
653A
Bear and Three Balls
brute force
,
implementation
,
sortings
900
x7991
263B
Squares
greedy
,
implementation
,
sortings
900
x8702
246A
Buggy Sorting
constructive algorithms
,
greedy
,
sortings
900
x9033
814A
An abandoned sentiment from past
constructive algorithms
,
greedy
,
implementation
,
sortings
900
x10239
63A
Sinking Ship
implementation
,
sortings
,
strings
900
x10840
1011A
Stages
greedy
,
implementation
,
sortings
900
x11918
991B
Getting an A
greedy
,
sortings
900
x12296
1132B
Discounts
greedy
,
sortings
900
x12686
1197A
DIY Wooden Ladder
greedy
,
math
,
sortings
900
x13240
1106C
Lunar New Year and Number Division
greedy
,
implementation
,
math
,
sortings
900
x14265
1025A
Doggo Recoloring
implementation
,
sortings
900
x14520
1823B
Sort with Step
brute force
,
math
,
sortings
900
x15281
1584C
Two Arrays
greedy
,
math
,
sortings
900
x15840
1093B
Letters Rearranging
constructive algorithms
,
greedy
,
sortings
,
strings
900
x16094
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