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Rayan
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Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
26:39:36
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Difficulty:
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combine-tags-by-or
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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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Status
Standings
Custom test
Problems
#
Name
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x691
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1140
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x2092
1795D
Triangle Coloring
combinatorics
,
math
1600
x9493
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x12979
1795B
Ideal Point
brute force
,
geometry
,
greedy
900
x22320
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23764
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1127
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3652
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x14406
1794B
Not Dividing
constructive algorithms
,
greedy
,
math
900
x23757
1794A
Prefix and Suffix Array
strings
800
x17311
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1420
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x1115
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x6333
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x21431
1793B
Fedya and Array
constructive algorithms
,
math
1100
x15994
1793A
Yet Another Promotion
greedy
,
math
800
x18161
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x399
1792F1
Graph Coloring (easy version)
combinatorics
,
dp
,
graphs
2700
x747
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1412
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x6386
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x14446
1792B
Stand-up Comedian
greedy
,
math
1200
x21769
1792A
GamingForces
greedy
,
sortings
800
x28438
1791G2
Teleporters (Hard Version)
binary search
,
greedy
,
sortings
1900
x4893
1791G1
Teleporters (Easy Version)
greedy
,
sortings
1100
x23690
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x12793
1791E
Negatives and Positives
dp
,
greedy
,
sortings
1100
x29691
1791D
Distinct Split
brute force
,
greedy
,
strings
1000
x32283
1791C
Prepend and Append
implementation
,
two pointers
800
x48070
1791B
Following Directions
geometry
,
implementation
800
x45743
1791A
Codeforces Checking
implementation
,
strings
800
x63784
1790G
Tokens on Graph
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2300
x1150
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3408
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x15444
1790D
Matryoshkas
data structures
,
greedy
,
sortings
1200
x21166
1790C
Premutation
brute force
,
implementation
,
math
1000
x24412
1790B
Taisia and Dice
greedy
,
greedy
,
math
800
x27678
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x37603
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x734
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x834
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1713
1789C
Serval and Toxel's Arrays
combinatorics
,
dp
,
implementation
,
math
1500
x8714
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x16325
1789A
Serval and Mocha's Array
brute force
,
math
,
number theory
800
x19931
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x883
1788E
Sum Over Zero
data structures
,
dfs and similar
,
dp
2200
x2745
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3997
1788C
Matching Numbers
constructive algorithms
,
greedy
,
math
1300
x17547
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x20382
1788A
One and Two
brute force
,
implementation
,
math
800
x32404
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x253
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x239
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x447
1787F
Inverse Transformation
constructive algorithms
,
implementation
,
math
2500
x694
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2385
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3448
1787C
Remove the Bracket
dp
,
greedy
,
math
1600
x7219
1787B
Number Factorization
greedy
,
math
,
number theory
1100
x13467
1787A
Exponential Equation
constructive algorithms
,
math
800
x19337
1786B
Cake Assembly Line
brute force
,
sortings
1300
x9106
1786A2
Alternating Deck (hard version)
implementation
800
x11486
1786A1
Non-alternating Deck (easy version)
implementation
800
x14130
1784F
Minimums or Medians
3400
x255
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x347
1784D
Wooden Spoon
combinatorics
,
dp
2400
x1050
1784C
Monsters (hard version)
data structures
,
greedy
2200
x1696
1784B
Letter Exchange
constructive algorithms
1900
x3376
1784A
Monsters (easy version)
brute force
,
greedy
1000
x15377
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x485
1783F
Double Sort II
dfs and similar
,
flows
,
graph matchings
,
graphs
2500
x1056
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x2146
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4549
1783C
Yet Another Tournament
binary search
,
greedy
,
sortings
1700
x9488
1783B
Matrix of Differences
constructive algorithms
,
math
1100
x18071
1783A
Make it Beautiful
constructive algorithms
,
math
,
sortings
800
x31429
1781H2
Window Signals (hard version)
3500
x98
1781H1
Window Signals (easy version)
3200
x120
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x234
1781F
Bracket Insertion
combinatorics
,
dp
,
math
,
trees
2700
x935
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1314
1781D
Many Perfect Squares
brute force
,
math
,
number theory
1800
x5597
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7847
1781B
Going to the Cinema
brute force
,
greedy
,
sortings
1000
x13653
1781A
Parallel Projection
geometry
,
math
800
x15179
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x758
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1563
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1479
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x5058
1780B
GCD Partition
brute force
,
greedy
,
math
,
number theory
1100
x18702
1780A
Hayato and School
constructive algorithms
,
greedy
800
x21850
1779H
Olympic Team Building
brute force
,
meet-in-the-middle
3500
x145
1779G
The Game of the Century
constructive algorithms
,
graphs
,
shortest paths
3000
x331
1779F
Xorcerer's Stones
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x1276
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1807
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x8049
1779C
Least Prefix Sum
data structures
,
greedy
1600
x12635
1779B
MKnez's ConstructiveForces Task
constructive algorithms
,
math
900
x23806
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x23270
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