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Educational Codeforces Round 165 (Rated for Div. 2)
45:57:42
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binary search
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
1846E2
Rudolf and Snowflakes (hard version)
binary search
,
brute force
,
implementation
,
math
1800
x6558
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7287
1845C
Strong Password
binary search
,
dp
,
greedy
,
strings
1400
x13281
1844F2
Min Cost Permutation (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
,
sortings
2800
x368
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x10904
1840D
Wooden Toy Festival
binary search
,
greedy
,
sortings
1400
x12706
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x291
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2057
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x895
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2043
1832F
Zombies
binary search
,
dp
3200
x250
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1785
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2783
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x357
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1132
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1756
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3646
1821D
Black Cells
binary search
,
brute force
,
greedy
,
math
1900
x4737
1817A
Almost Increasing Subsequence
binary search
,
data structures
,
greedy
1500
x10278
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x817
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1608
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x11499
1810D
Climbing the Tree
binary search
,
math
1700
x7055
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x703
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x789
1809B
Points on Plane
binary search
,
greedy
,
math
1000
x18982
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2149
1807E
Interview
binary search
,
implementation
,
interactive
1300
x11787
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x808
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x11977
1804F
Approximate Diameter
binary search
,
divide and conquer
,
graphs
,
shortest paths
2700
x849
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2033
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3200
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x766
1796C
Maximum Set
binary search
,
math
1600
x9728
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1044
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x1909
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x11345
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x12404
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x923
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5737
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5861
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13141
1791G2
Teleporters (Hard Version)
binary search
,
greedy
,
sortings
1900
x4449
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x11424
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3714
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x197
1783C
Yet Another Tournament
binary search
,
greedy
,
sortings
1700
x8765
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1261
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x665
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1297
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4632
1777E
Edge Reverse
binary search
,
dfs and similar
,
graphs
,
trees
2200
x1683
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x7675
1776M
Parmigiana With Seafood
binary search
,
dp
,
greedy
,
trees
3000
x343
1776L
Controllers
binary search
,
math
1500
x5147
1774F2
Magician and Pigs (Hard Version)
binary search
,
brute force
,
data structures
,
implementation
2700
x637
1773H
Hot and Cold
binary search
,
interactive
2600
x336
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x729
1772G
Gaining Rating
binary search
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
2200
x1262
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x958
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x12763
1769B2
Копирование файлов II
*special problem
,
binary search
,
brute force
,
math
1400
x853
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1123
1765H
Hospital Queue
binary search
,
graphs
,
greedy
,
implementation
2200
x1182
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x3903
1764G3
Doremy's Perfect DS Class (Hard Version)
binary search
,
interactive
3300
x428
1764G2
Doremy's Perfect DS Class (Medium Version)
binary search
,
interactive
3000
x494
1764G1
Doremy's Perfect DS Class (Easy Version)
binary search
,
interactive
2900
x544
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x13860
1762F
Good Pairs
binary search
,
data structures
,
dp
2600
x558
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1720
1760F
Quests
binary search
,
greedy
,
sortings
1500
x11242
1759G
Restore the Permutation
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
1900
x4205
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x3679
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x6846
1753E
N Machines
binary search
,
brute force
,
greedy
3300
x307
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1356
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x13258
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1696
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x4465
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x88
1746E1
Joking (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
ternary search
2500
x1341
1744C
Traffic Light
binary search
,
implementation
,
two pointers
1000
x24072
1743E
FTL
binary search
,
dp
2400
x1472
1742E
Scuza
binary search
,
greedy
,
math
1200
x21678
1741F
Multi-Colored Segments
binary search
,
data structures
,
math
,
sortings
2000
x2212
1739D
Reset K Edges
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x4853
1737G
Ela Takes Dancing Class
binary search
,
data structures
3500
x108
1737B
Ela's Fitness and the Luxury Number
binary search
,
implementation
,
math
1300
x9163
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1230
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14463
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2451
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x5552
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x6687
1730B
Meeting on the Line
binary search
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
1600
x11789
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x409
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x80
1725G
Garage
binary search
,
geometry
,
math
1500
x5580
1725D
Deducing Sortability
binary search
,
bitmasks
,
math
2900
x117
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