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Before contest
Educational Codeforces Round 165 (Rated for Div. 2)
30:25:14
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Difficulty:
—
greedy
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
1795B
Ideal Point
brute force
,
geometry
,
greedy
900
x21126
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1003
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x12406
1794B
Not Dividing
constructive algorithms
,
greedy
,
math
900
x19350
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
1793A
Yet Another Promotion
greedy
,
math
800
x17696
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13145
1792B
Stand-up Comedian
greedy
,
math
1200
x20136
1792A
GamingForces
greedy
,
sortings
800
x27091
1791G2
Teleporters (Hard Version)
binary search
,
greedy
,
sortings
1900
x4449
1791G1
Teleporters (Easy Version)
greedy
,
sortings
1100
x20393
1791E
Negatives and Positives
dp
,
greedy
,
sortings
1100
x25433
1791D
Distinct Split
brute force
,
greedy
,
strings
1000
x26735
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3137
1790D
Matryoshkas
data structures
,
greedy
,
sortings
1200
x18070
1790B
Taisia and Dice
greedy
,
greedy
,
math
800
x26611
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x511
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x783
1788C
Matching Numbers
constructive algorithms
,
greedy
,
math
1300
x16407
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x19195
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2169
1787C
Remove the Bracket
dp
,
greedy
,
math
1600
x6684
1787B
Number Factorization
greedy
,
math
,
number theory
1100
x12663
1784C
Monsters (hard version)
data structures
,
greedy
2200
x1520
1784A
Monsters (easy version)
brute force
,
greedy
1000
x14437
1783C
Yet Another Tournament
binary search
,
greedy
,
sortings
1700
x8766
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1261
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7018
1781B
Going to the Cinema
brute force
,
greedy
,
sortings
1000
x13203
1780B
GCD Partition
brute force
,
greedy
,
math
,
number theory
1100
x16493
1780A
Hayato and School
constructive algorithms
,
greedy
800
x21048
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1684
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7469
1779C
Least Prefix Sum
data structures
,
greedy
1600
x11768
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x22870
1778B
The Forbidden Permutation
greedy
,
math
1300
x12881
1778A
Flip Flop Sum
greedy
,
implementation
800
x23736
1777B
Emordnilap
combinatorics
,
greedy
,
math
900
x16557
1777A
Everybody Likes Good Arrays!
greedy
,
math
800
x21087
1776M
Parmigiana With Seafood
binary search
,
dp
,
greedy
,
trees
3000
x343
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x638
1776F
Train Splitting
constructive algorithms
,
graphs
,
greedy
1700
x3212
1776D
Teamwork
constructive algorithms
,
greedy
,
math
2800
x338
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x754
1776A
Walking Boy
greedy
800
x6759
1775F
Laboratory on Pluto
constructive algorithms
,
dp
,
greedy
,
math
2500
x737
1775E
The Human Equation
greedy
,
implementation
2100
x3020
1775A2
Gardener and the Capybaras (hard version)
constructive algorithms
,
greedy
900
x18253
1774E
Two Chess Pieces
dfs and similar
,
dp
,
greedy
,
trees
1900
x3304
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7393
1774C
Ice and Fire
constructive algorithms
,
dp
,
greedy
1300
x11531
1774B
Coloring
constructive algorithms
,
greedy
,
math
1500
x11525
1773E
Easy Assembly
greedy
,
sortings
1400
x4634
1773D
Dominoes
combinatorics
,
flows
,
graph matchings
,
greedy
2600
x417
1772G
Gaining Rating
binary search
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
2200
x1262
1772C
Different Differences
constructive algorithms
,
greedy
,
math
1000
x22629
1771C
Hossam and Trainees
greedy
,
math
,
number theory
1600
x8962
1770A
Koxia and Whiteboards
brute force
,
greedy
1000
x22824
1769C1
Подкрутка I
*special problem
,
brute force
,
dp
,
greedy
1200
x928
1768F
Wonderful Jump
dp
,
greedy
2900
x781
1768D
Lucky Permutation
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1800
x6674
1768C
Elemental Decompress
constructive algorithms
,
greedy
,
implementation
,
sortings
1300
x13526
1768B
Quick Sort
greedy
,
math
900
x21972
1768A
Greatest Convex
greedy
,
math
,
number theory
800
x27923
1767D
Playoff
combinatorics
,
constructive algorithms
,
dp
,
greedy
,
math
1500
x9383
1767B
Block Towers
data structures
,
greedy
,
sortings
800
x19552
1765N
Number Reduction
greedy
1500
x4406
1765K
Torus Path
greedy
,
math
1500
x5359
1765H
Hospital Queue
binary search
,
graphs
,
greedy
,
implementation
2200
x1187
1765B
Broken Keyboard
greedy
800
x8708
1764E
Doremy's Number Line
dp
,
greedy
,
sortings
2400
x1176
1764C
Doremy's City Construction
graphs
,
greedy
1400
x9034
1764A
Doremy's Paint
greedy
800
x16175
1763C
Another Array Problem
brute force
,
constructive algorithms
,
greedy
2000
x6264
1763A
Absolute Maximization
bitmasks
,
constructive algorithms
,
greedy
,
math
800
x15235
1762A
Divide and Conquer
greedy
,
math
,
number theory
800
x18504
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1720
1761C
Set Construction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1400
x9146
1761B
Elimination of a Ring
constructive algorithms
,
greedy
,
implementation
1000
x12985
1760F
Quests
binary search
,
greedy
,
sortings
1500
x11245
1760E
Binary Inversions
data structures
,
greedy
,
math
1100
x19122
1760B
Atilla's Favorite Problem
greedy
,
implementation
,
strings
800
x41509
1759G
Restore the Permutation
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
1900
x4207
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x3680
1759C
Thermostat
greedy
,
math
,
shortest paths
1100
x16951
1758C
Almost All Multiples
greedy
,
number theory
1400
x12865
1754B
Kevin and Permutation
constructive algorithms
,
greedy
,
math
800
x18464
1754A
Technical Support
greedy
800
x22574
1753E
N Machines
binary search
,
brute force
,
greedy
3300
x307
1753A2
Make Nonzero Sum (hard version)
constructive algorithms
,
dp
,
greedy
1500
x9756
1753A1
Make Nonzero Sum (easy version)
constructive algorithms
,
dp
,
greedy
1300
x14254
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1357
1750B
Maximum Substring
brute force
,
greedy
,
implementation
800
x15934
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x13264
1749B
Death's Blessing
greedy
900
x20312
1749A
Cowardly Rooks
greedy
,
implementation
800
x21949
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x10409
1747A
Two Groups
constructive algorithms
,
greedy
800
x24314
1746D
Paths on the Tree
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1900
x4413
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