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Before contest
Educational Codeforces Round 166 (Rated for Div. 2)
30:39:38
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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
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Problems
#
Name
1958J
Necromancer
*special problem
3200
x15
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
3100
x21
1958H
Composite Spells
*special problem
,
dp
2600
x64
1958G
Observation Towers
*special problem
2400
x91
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x151
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x205
1958D
Staircase
*special problem
1600
x358
1958C
Firewood
*special problem
1500
x483
1958B
Clock in the Pool
*special problem
,
math
1400
x660
1958A
1-3-5
*special problem
,
dp
1100
x1105
1953A
Accuracy-Preserving Summation Algorithm
*special problem
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x124
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x32
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x176
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x80
1939D
Big Persimmon
*special problem
,
dp
,
games
x83
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x277
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x209
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x19
1910J
Two Colors
*special problem
2900
x45
1910I
Inverse Problem
*special problem
,
combinatorics
,
dp
2700
x43
1910H
Sum of Digits of Sums
*special problem
,
binary search
,
data structures
2400
x81
1910G
Pool Records
*special problem
,
greedy
2700
x53
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x164
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x179
1910D
Remove and Add
*special problem
,
greedy
1800
x316
1910C
Poisonous Swamp
*special problem
,
*special problem
,
implementation
,
implementation
1600
x591
1910B
Security Guard
*special problem
,
greedy
1600
x608
1910A
Username
*special problem
,
implementation
1100
x1623
1885A
Deterministic Scheduling for Extended Reality over 5G and Beyond
*special problem
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5805
1812I
Mountain Climber
*special problem
x257
1812H
Expected Twist
*special problem
,
interactive
x136
1812G
Colour Vision
*special problem
,
implementation
x530
1812F
Factorization
*special problem
,
number theory
x962
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x3953
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4345
1812C
Digits
*special problem
x1229
1812B
Was it Rated?
*special problem
,
*special problem
,
*special problem
,
brute force
,
implementation
x5590
1812A
Are You a Robot?
*special problem
,
*special problem
,
*special problem
,
expression parsing
,
strings
x13094
1769D3
Игра в Девятку III
*special problem
,
brute force
2300
x116
1769D2
Игра в Девятку II
*special problem
,
brute force
2200
x187
1769D1
Игра в Девятку I
*special problem
,
brute force
,
dp
1800
x369
1769C2
Подкрутка II
*special problem
,
dp
1300
x919
1769C1
Подкрутка I
*special problem
,
brute force
,
dp
,
greedy
1200
x933
1769B2
Копирование файлов II
*special problem
,
binary search
,
brute force
,
math
1400
x859
1769B1
Копирование файлов I
*special problem
,
brute force
,
implementation
,
math
1000
x1318
1769A
Узкая дорога
*special problem
,
math
800
x1910
1663H
Cross-Language Program
*special problem
,
constructive algorithms
x1265
1663G
Six Characters
*special problem
,
constructive algorithms
,
strings
x205
1663F
In Every Generation...
*special problem
,
strings
x329
1663E
Are You Safe?
*special problem
,
implementation
x542
1663D
Is it rated - 3
*special problem
,
combinatorics
,
dp
,
math
x1388
1663C
Pōja Verdon
*special problem
,
implementation
,
math
x5622
1663B
Mike's Sequence
*special problem
,
divide and conquer
,
implementation
,
math
x3360
1663A
Who Tested?
*special problem
,
expression parsing
,
trees
x10410
1576A
Communication Routing Challenge
*special problem
1571J
Two Railroads
*special problem
3000
x37
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x55
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x45
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x72
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x178
1571E
Fix the String
*special problem
,
bitmasks
,
dp
,
greedy
1700
x327
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x323
1571C
Rhyme
*special problem
,
implementation
1800
x362
1571B
Epic Novel
*special problem
,
math
1300
x686
1571A
Sequence of Comparisons
*special problem
800
x1257
1533J
Pawns
*special problem
x42
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x49
1533H
Submatrices
*special problem
,
bitmasks
,
data structures
,
dp
x81
1533G
Biome Map
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
x87
1533F
Binary String Partition
*special problem
,
binary search
,
greedy
x213
1533E
Chess Team Forming
*special problem
,
binary search
,
data structures
,
greedy
x273
1533D
String Searching
*special problem
,
hashing
x439
1533C
Sweets
*special problem
,
data structures
,
implementation
x468
1533B
Nearest Point Function
*special problem
,
implementation
x763
1533A
Travel to Bertown
*special problem
,
implementation
,
math
x1066
1532F
Prefixes and Suffixes
*special problem
,
strings
x217
1532E
Good Array
*special problem
x387
1532D
Teams Forming
*special problem
,
sortings
x582
1532C
Uniform String
*special problem
,
implementation
x636
1532B
Frog Jumping
*special problem
,
math
x820
1532A
A+B (Trial Problem)
*special problem
x1133
1531E3
Сортировка слиянием
*special problem
,
binary search
x267
1531E2
Сортировка слиянием
*special problem
,
*special problem
,
brute force
x331
1531E1
Сортировка слиянием
*special problem
x356
1531D
Редактируем Зингер | color
*special problem
,
*special problem
x351
1531C
Симметричный амфитеатр
*special problem
,
constructive algorithms
,
dp
x646
1531B2
Мониторинг
*special problem
x765
1531B1
Мониторинг
*special problem
,
*special problem
x1088
1531A
Зингер | color
*special problem
,
implementation
x1444
1505I
Mysterious language again, seriously?
*special problem
2200
x542
1505H
L BREAK into program
*special problem
2500
x488
1505G
Encoded message
*special problem
,
implementation
2600
x294
1505F
Math
*special problem
,
math
2200
x1476
1505E
Cakewalk
*special problem
,
greedy
,
implementation
,
shortest paths
1800
x1728
1505D
Xenolith? Hippodrome?
*special problem
,
number theory
1800
x741
1505C
Fibonacci Words
*special problem
,
implementation
1400
x6309
1505B
DMCA
*special problem
,
implementation
,
number theory
1600
x6015
1505A
Is it rated - 2
*special problem
,
implementation
,
interactive
900
x14053
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