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Rayan
→ Pay attention
Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
45:27:34
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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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Problems
#
Name
1372E
Omkar and Last Floor
dp
,
greedy
,
two pointers
2900
x1242
1372D
Omkar and Circle
brute force
,
dp
,
games
,
greedy
2100
x5438
1372C
Omkar and Baseball
constructive algorithms
,
math
1500
x18018
1372B
Omkar and Last Class of Math
greedy
,
math
,
number theory
1300
x28697
1372A
Omkar and Completion
constructive algorithms
,
implementation
800
x32104
1371F
Raging Thunder
data structures
,
divide and conquer
,
implementation
2800
x625
1371E2
Asterism (Hard Version)
binary search
,
combinatorics
,
dp
,
math
,
number theory
,
sortings
2300
x2368
1371E1
Asterism (Easy Version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
sortings
1900
x5287
1371D
Grid-00100
constructive algorithms
,
greedy
,
implementation
1600
x13066
1371C
A Cookie for You
greedy
,
implementation
,
math
1300
x20664
1371B
Magical Calendar
math
1200
x19232
1371A
Magical Sticks
math
800
x46734
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x1514
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1640
1370E
Binary Subsequence Rotation
binary search
,
constructive algorithms
,
data structures
,
greedy
2100
x4932
1370D
Odd-Even Subsequence
binary search
,
dp
,
dsu
,
greedy
,
implementation
2000
x9818
1370C
Number Game
games
,
math
,
number theory
1400
x24898
1370B
GCD Compression
constructive algorithms
,
math
,
number theory
1100
x23865
1370A
Maximum GCD
greedy
,
implementation
,
math
,
number theory
800
x53586
1369F
BareLee
dfs and similar
,
dp
,
games
2700
x654
1369E
DeadLee
data structures
,
dfs and similar
,
greedy
,
implementation
,
sortings
2400
x2286
1369D
TediousLee
dp
,
graphs
,
greedy
,
math
,
trees
1900
x8717
1369C
RationalLee
greedy
,
math
,
sortings
,
two pointers
1400
x19735
1369B
AccurateLee
greedy
,
implementation
,
strings
1200
x24610
1369A
FashionabLee
geometry
,
math
800
x36908
1368H2
Breadboard Capacity (hard version)
3500
x232
1368H1
Breadboard Capacity (easy version)
dp
,
flows
,
greedy
3300
x358
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x610
1368F
Lamps on a Circle
games
,
implementation
,
interactive
,
math
2600
x1054
1368E
Ski Accidents
constructive algorithms
,
graphs
,
greedy
2500
x2231
1368D
AND, OR and square sum
bitmasks
,
greedy
,
math
1700
x12002
1368C
Even Picture
constructive algorithms
1500
x13520
1368B
Codeforces Subsequences
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1500
x19976
1368A
C+=
brute force
,
greedy
,
implementation
,
math
800
x40249
1367F2
Flying Sort (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2400
x1693
1367F1
Flying Sort (Easy Version)
dp
,
greedy
,
two pointers
2100
x3321
1367E
Necklace Assembly
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
number theory
1900
x5504
1367D
Task On The Board
constructive algorithms
,
greedy
,
implementation
,
sortings
1800
x8395
1367C
Social Distance
constructive algorithms
,
greedy
,
math
1300
x23741
1367B
Even Array
greedy
,
math
800
x54843
1367A
Short Substrings
implementation
,
strings
800
x58553
1366G
Construct the String
data structures
,
dp
,
strings
2700
x557
1366F
Jog Around The Graph
binary search
,
dp
,
geometry
,
graphs
2700
x824
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x4317
1366D
Two Divisors
constructive algorithms
,
math
,
number theory
2000
x10748
1366C
Palindromic Paths
greedy
,
math
1500
x13643
1366B
Shuffle
math
,
two pointers
1300
x21512
1366A
Shovels and Swords
binary search
,
greedy
,
math
1100
x30525
1365G
Secure Password
bitmasks
,
combinatorics
,
constructive algorithms
,
interactive
,
math
2800
x1180
1365F
Swaps Again
constructive algorithms
,
implementation
,
sortings
2100
x4488
1365E
Maximum Subsequence Value
brute force
,
constructive algorithms
1900
x7914
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x17732
1365C
Rotation Matching
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x23365
1365B
Trouble Sort
constructive algorithms
,
implementation
1300
x27162
1365A
Matrix Game
games
,
greedy
,
implementation
1100
x24238
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x1447
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x4465
1364C
Ehab and Prefix MEXs
brute force
,
constructive algorithms
,
greedy
1600
x13291
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x20295
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x28567
1363F
Rotating Substrings
dp
,
strings
2600
x1558
1363E
Tree Shuffling
dfs and similar
,
dp
,
greedy
,
trees
2000
x6893
1363D
Guess The Maximums
binary search
,
implementation
,
interactive
,
math
2100
x4107
1363C
Game On Leaves
games
,
trees
1600
x19048
1363B
Subsequence Hate
implementation
,
strings
1400
x23875
1363A
Odd Selection
brute force
,
implementation
,
math
1200
x36487
1362C
Johnny and Another Rating Drop
bitmasks
,
greedy
,
math
1400
x18744
1362B
Johnny and His Hobbies
bitmasks
,
brute force
1200
x19473
1362A
Johnny and Ancient Computer
implementation
1000
x24789
1361F
Johnny and New Toy
data structures
,
implementation
,
math
3300
x155
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x705
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x323
1361C
Johnny and Megan's Necklace
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1654
1361B
Johnny and Grandmaster
greedy
,
implementation
,
math
,
sortings
1900
x3707
1361A
Johnny and Contribution
constructive algorithms
,
graphs
,
greedy
,
sortings
1700
x8472
1360H
Binary Median
binary search
,
bitmasks
,
brute force
,
constructive algorithms
2100
x4623
1360G
A/B Matrix
constructive algorithms
,
greedy
,
math
1900
x7869
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x12563
1360E
Polygon
dp
,
graphs
,
implementation
,
shortest paths
1300
x25750
1360D
Buying Shovels
math
,
number theory
1300
x34038
1360C
Similar Pairs
constructive algorithms
,
graph matchings
,
greedy
,
sortings
1100
x33230
1360B
Honest Coach
greedy
,
sortings
800
x48715
1360A
Minimal Square
greedy
,
math
800
x51684
1359F
RC Kaboom Show
binary search
,
brute force
,
data structures
,
geometry
,
math
2900
x546
1359E
Modular Stability
combinatorics
,
math
,
number theory
2000
x6189
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x9617
1359C
Mixing Water
binary search
,
math
1700
x13993
1359B
New Theatre Square
brute force
,
dp
,
greedy
,
implementation
,
two pointers
1000
x27997
1359A
Berland Poker
brute force
,
greedy
,
math
1000
x29912
1358F
Tasty Cookie
binary search
,
constructive algorithms
,
greedy
,
implementation
2700
x464
1358E
Are You Fired?
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x2347
1358D
The Best Vacation
binary search
,
brute force
,
greedy
,
implementation
,
two pointers
1900
x8273
1358C
Celex Update
math
1600
x17526
1358B
Maria Breaks the Self-isolation
greedy
,
sortings
1000
x25059
1358A
Park Lighting
greedy
,
math
800
x39937
1357E2
Root of quantum Fourier transform
*special problem
x51
1357E1
Power of quantum Fourier transform
*special problem
x193
1357D5
Quantum Classification - Dataset 7
*special problem
x82
1357D4
Quantum Classification - Dataset 6
*special problem
x85
1357D3
Quantum Classification - Dataset 5
*special problem
x105
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