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Rayan
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Before contest
Educational Codeforces Round 174 (Rated for Div. 2)
34:07:40
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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
2011I
Stack and Queue
*special problem
,
data structures
,
divide and conquer
x16
2011H
Strange Matrix
*special problem
,
graphs
,
greedy
x47
2011G
Removal of a Permutation
*special problem
x39
2011F
Good Subarray
*special problem
,
data structures
,
greedy
x117
2011E
Rock-Paper-Scissors Bot
*special problem
,
greedy
,
strings
x162
2011D
Among Wolves
*special problem
x261
2011C
Split the Expression
*special problem
x351
2011B
Shuffle
*special problem
x631
2011A
Problem Solving
*special problem
x1035
1958J
Necromancer
*special problem
3200
x36
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
3100
x37
1958H
Composite Spells
*special problem
,
dp
2600
x81
1958G
Observation Towers
*special problem
2400
x113
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x210
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x282
1958D
Staircase
*special problem
1600
x567
1958C
Firewood
*special problem
1500
x795
1958B
Clock in the Pool
*special problem
,
math
1400
x991
1958A
1-3-5
*special problem
,
dp
1100
x2126
1953A
Accuracy-Preserving Summation Algorithm
*special problem
1952J
Help, what does it mean to be "Based"
*special problem
,
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x792
1952I
Dark Matter
*special problem
,
bitmasks
,
geometry
x553
1952H
Palindrome
*special problem
,
implementation
,
strings
x716
1952G
Mathematician Takeover
*special problem
,
binary search
,
dfs and similar
,
math
x1061
1952F
Grid
*special problem
,
brute force
x1784
1952E
Sweep Line
*special problem
,
combinatorics
,
games
,
math
x268
1952D
Are You a Procrastinator?
*special problem
,
implementation
x4750
1952C
They Have Fooled
*special problem
,
brute force
,
schedules
x2978
1952B
Is it stated?
*special problem
,
strings
x11359
1952A
Are You a Robot, Again?
*special problem
,
strings
x12782
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x152
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x36
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x220
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x88
1939D
Big Persimmon
*special problem
,
dp
,
games
x102
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x329
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x255
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x24
1910J
Two Colors
*special problem
2900
x51
1910I
Inverse Problem
*special problem
,
combinatorics
,
dp
2700
x53
1910H
Sum of Digits of Sums
*special problem
,
binary search
,
data structures
2400
x97
1910G
Pool Records
*special problem
,
greedy
2700
x65
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x185
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x210
1910D
Remove and Add
*special problem
,
greedy
1800
x370
1910C
Poisonous Swamp
*special problem
,
*special problem
,
implementation
,
implementation
1600
x662
1910B
Security Guard
*special problem
,
greedy
1600
x699
1910A
Username
*special problem
,
implementation
1100
x1844
1885A
Deterministic Scheduling for Extended Reality over 5G and Beyond
*special problem
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x6012
1812I
Mountain Climber
*special problem
x273
1812H
Expected Twist
*special problem
,
interactive
x151
1812G
Colour Vision
*special problem
,
implementation
x559
1812F
Factorization
*special problem
,
number theory
x1271
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x4071
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4694
1812C
Digits
*special problem
x1282
1812B
Was it Rated?
*special problem
,
*special problem
,
*special problem
,
brute force
,
implementation
x5779
1812A
Are You a Robot?
*special problem
,
*special problem
,
*special problem
,
expression parsing
,
strings
x13533
1769D3
Игра в Девятку III
*special problem
,
brute force
2300
x120
1769D2
Игра в Девятку II
*special problem
,
brute force
2200
x198
1769D1
Игра в Девятку I
*special problem
,
brute force
,
dp
1800
x390
1769C2
Подкрутка II
*special problem
,
dp
1300
x998
1769C1
Подкрутка I
*special problem
,
brute force
,
dp
,
greedy
1200
x998
1769B2
Копирование файлов II
*special problem
,
binary search
,
brute force
,
math
1400
x893
1769B1
Копирование файлов I
*special problem
,
brute force
,
implementation
,
math
1000
x1405
1769A
Узкая дорога
*special problem
,
math
800
x2001
1663H
Cross-Language Program
*special problem
,
constructive algorithms
x1289
1663G
Six Characters
*special problem
,
constructive algorithms
,
strings
x215
1663F
In Every Generation...
*special problem
,
strings
x351
1663E
Are You Safe?
*special problem
,
implementation
x562
1663D
Is it rated - 3
*special problem
,
combinatorics
,
dp
,
math
x1428
1663C
Pōja Verdon
*special problem
,
implementation
,
math
x5723
1663B
Mike's Sequence
*special problem
,
divide and conquer
,
implementation
,
math
x3438
1663A
Who Tested?
*special problem
,
expression parsing
,
trees
x10585
1576A
Communication Routing Challenge
*special problem
1571J
Two Railroads
*special problem
3000
x44
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x62
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x52
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x79
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x209
1571E
Fix the String
*special problem
,
bitmasks
,
dp
,
greedy
1700
x345
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x346
1571C
Rhyme
*special problem
,
implementation
1800
x385
1571B
Epic Novel
*special problem
,
math
1300
x730
1571A
Sequence of Comparisons
*special problem
800
x1383
1533J
Pawns
*special problem
x45
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x53
1533H
Submatrices
*special problem
,
bitmasks
,
data structures
,
dp
x85
1533G
Biome Map
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
x91
1533F
Binary String Partition
*special problem
,
binary search
,
greedy
x217
1533E
Chess Team Forming
*special problem
,
binary search
,
data structures
,
greedy
x278
1533D
String Searching
*special problem
,
hashing
x444
1533C
Sweets
*special problem
,
data structures
,
implementation
x475
1533B
Nearest Point Function
*special problem
,
implementation
x773
1533A
Travel to Bertown
*special problem
,
implementation
,
math
x1081
1532F
Prefixes and Suffixes
*special problem
,
strings
x219
1532E
Good Array
*special problem
x391
1532D
Teams Forming
*special problem
,
sortings
x588
1532C
Uniform String
*special problem
,
implementation
x640
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