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Rayan
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Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
15:03:22
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Difficulty:
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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
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x455
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x952
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x5105
1493C
K-beautiful Strings
binary search
,
brute force
,
constructive algorithms
,
greedy
,
strings
2000
x4672
1493B
Planet Lapituletti
brute force
,
implementation
1300
x11923
1493A
Anti-knapsack
constructive algorithms
,
greedy
800
x19392
1492E
Almost Fault-Tolerant Database
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
2500
x1214
1492D
Genius's Gambit
bitmasks
,
constructive algorithms
,
greedy
,
math
1900
x6180
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x16308
1492B
Card Deck
data structures
,
greedy
,
math
1100
x18562
1492A
Three swimmers
math
800
x22801
1491I
Ruler Of The Zoo
brute force
,
data structures
3500
x86
1491H
Yuezheng Ling and Dynamic Tree
data structures
,
trees
3400
x916
1491G
Switch and Flip
constructive algorithms
,
graphs
,
math
2800
x846
1491F
Magnets
binary search
,
constructive algorithms
,
interactive
2700
x1022
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2186
1491D
Zookeeper and The Infinite Zoo
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
1800
x7274
1491C
Pekora and Trampoline
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x8017
1491B
Minimal Cost
brute force
,
math
1200
x13898
1491A
K-th Largest Value
brute force
,
greedy
,
implementation
800
x18326
1490G
Old Floppy Drive
binary search
,
data structures
,
math
1900
x5745
1490F
Equalize the Array
binary search
,
data structures
,
greedy
,
math
,
sortings
1500
x16431
1490E
Accidental Victory
binary search
,
data structures
,
greedy
1400
x19386
1490D
Permutation Transformation
dfs and similar
,
divide and conquer
,
implementation
1200
x19734
1490C
Sum of Cubes
binary search
,
brute force
,
brute force
,
math
1100
x34004
1490B
Balanced Remainders
brute force
,
constructive algorithms
,
math
1000
x26439
1490A
Dense Array
greedy
,
math
800
x31397
1488J
Flower Shop
*special problem
,
data structures
,
fft
,
math
3100
x35
1488I
Demonic Invasion
*special problem
,
flows
3100
x37
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x59
1488G
Painting Numbers
*special problem
,
data structures
,
greedy
,
number theory
2500
x124
1488F
Dogecoin
*special problem
,
*special problem
,
binary search
,
data structures
2300
x178
1488E
Palindromic Doubles
*special problem
,
data structures
,
dp
2200
x217
1488D
Problemsolving Marathon
*special problem
,
binary search
,
greedy
1900
x341
1488C
Two Policemen
*special problem
,
binary search
,
brute force
,
math
1900
x430
1488B
RBS Deletion
*special problem
,
greedy
1800
x570
1488A
From Zero To Y
*special problem
,
math
900
x1453
1487G
String Counting
combinatorics
,
dp
,
fft
,
math
2700
x603
1487F
Ones
dp
,
greedy
,
shortest paths
2900
x394
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4611
1487D
Pythagorean Triples
binary search
,
brute force
,
math
,
number theory
1500
x18386
1487C
Minimum Ties
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
1500
x14320
1487B
Cat Cycle
math
,
number theory
1200
x21686
1487A
Arena
implementation
,
sortings
800
x26644
1486F
Pairs of Paths
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2600
x695
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x3001
1486D
Max Median
binary search
,
data structures
,
dp
2100
x7541
1486C2
Guessing the Greatest (hard version)
binary search
,
interactive
1900
x8685
1486C1
Guessing the Greatest (easy version)
binary search
,
interactive
1600
x12540
1486B
Eastern Exhibition
binary search
,
geometry
,
shortest paths
,
sortings
1500
x16330
1486A
Shifting Stacks
greedy
,
implementation
900
x25628
1485F
Copy or Prefix Sum
combinatorics
,
data structures
,
dp
,
sortings
2400
x2015
1485E
Move and Swap
dfs and similar
,
dp
,
greedy
,
trees
2500
x1369
1485D
Multiples and Power Differences
constructive algorithms
,
graphs
,
math
,
number theory
2200
x5225
1485C
Floor and Mod
binary search
,
brute force
,
math
,
number theory
1700
x10096
1485B
Replace and Keep Sorted
dp
,
implementation
,
math
1200
x17183
1485A
Add and Divide
brute force
,
greedy
,
math
,
number theory
1000
x23154
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x487
1482G
Vabank
binary search
,
interactive
3200
x292
1482F
Useful Edges
graphs
,
shortest paths
2400
x1571
1482E
Skyline Photo
data structures
,
divide and conquer
,
dp
2100
x3299
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x3908
1482C
Basic Diplomacy
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x9464
1482B
Restore Modulo
implementation
,
math
1500
x9255
1482A
Prison Break
math
800
x20563
1481F
AB Tree
dp
,
greedy
,
trees
3100
x514
1481E
Sorting Books
data structures
,
dp
,
greedy
2500
x2151
1481D
AB Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2000
x4603
1481C
Fence Painting
brute force
,
constructive algorithms
,
greedy
1600
x11751
1481B
New Colony
brute force
,
greedy
,
implementation
1100
x19355
1481A
Space Navigation
greedy
,
strings
800
x25041
1480B
The Great Hero
greedy
,
implementation
,
sortings
900
x17313
1480A
Yet Another String Game
games
,
greedy
,
strings
800
x26034
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x218
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x1035
1479C
Continuous City
bitmasks
,
constructive algorithms
2500
x1345
1479B2
Painting the Array II
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2100
x4114
1479B1
Painting the Array I
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
1900
x7059
1479A
Searching Local Minimum
binary search
,
interactive
,
ternary search
1700
x11912
1478C
Nezzar and Symmetric Array
implementation
,
math
,
sortings
1700
x9894
1478B
Nezzar and Lucky Number
brute force
,
dp
,
greedy
,
math
1100
x18379
1478A
Nezzar and Colorful Balls
brute force
,
greedy
800
x26682
1477F
Nezzar and Chocolate Bars
combinatorics
,
fft
,
math
,
probabilities
3500
x137
1477E
Nezzar and Tournaments
data structures
,
greedy
3300
x127
1477D
Nezzar and Hidden Permutations
constructive algorithms
,
dfs and similar
,
graphs
2800
x576
1477C
Nezzar and Nice Beatmap
constructive algorithms
,
geometry
,
greedy
,
math
,
sortings
2200
x2363
1477B
Nezzar and Binary String
data structures
,
greedy
1900
x3269
1477A
Nezzar and Board
constructive algorithms
,
math
,
number theory
1800
x6032
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x586
1476F
Lanterns
binary search
,
data structures
,
dp
3000
x824
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2400
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x8692
1476C
Longest Simple Cycle
dp
,
graphs
,
greedy
1600
x11477
1476B
Inflation
binary search
,
brute force
,
greedy
,
math
1300
x20216
1476A
K-divisible Sum
binary search
,
constructive algorithms
,
greedy
,
math
1000
x38523
1475G
Strange Beauty
dp
,
math
,
number theory
,
sortings
1900
x6959
1475F
Unusual Matrix
2-sat
,
brute force
,
constructive algorithms
1900
x5400
1475E
Advertising Agency
combinatorics
,
math
,
sortings
1600
x13981
1475D
Cleaning the Phone
binary search
,
dp
,
sortings
,
two pointers
1800
x10299
1475C
Ball in Berland
combinatorics
,
graphs
,
math
1400
x21661
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