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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
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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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Status
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Custom test
Problems
#
Name
1211D
Teams
*special problem
,
binary search
,
greedy
,
math
2000
x222
774L
Bars
*special problem
,
binary search
2000
x321
774J
Stepan's Series
*special problem
,
dp
2000
x349
656C
Without Text
*special problem
2000
x675
656E
Out of Controls
*special problem
2000
x715
784G
BF Calculator
*special problem
2000
x719
784B
Kids' Riddle
*special problem
2000
x825
1057C
Tanya and Colored Candies
*special problem
,
dp
2000
x854
171C
A Piece of Cake
*special problem
,
implementation
2000
x1049
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1267
171E
MYSTERIOUS LANGUAGE
*special problem
2000
x1394
784E
Twisted Circuit
*special problem
,
brute force
,
implementation
2000
x1866
522D
Closest Equals
*special problem
,
data structures
2000
x2930
683H
Exchange of Books
*special problem
1900
x95
72F
Oil
*special problem
,
greedy
,
math
1900
x116
683G
The Fraction
*special problem
1900
x130
470D
Caesar Cipher
*special problem
1900
x144
470E
Chessboard
*special problem
1900
x190
661B
Seasons
*special problem
1900
x222
162D
Remove digits
*special problem
1900
x223
661F
Primes in Interval
*special problem
1900
x230
470C
Eval
*special problem
1900
x230
1488D
Problemsolving Marathon
*special problem
,
binary search
,
greedy
1900
x316
1488C
Two Policemen
*special problem
,
binary search
,
brute force
,
math
1900
x397
784D
Touchy-Feely Palindromes
*special problem
,
implementation
1900
x423
656G
You're a Professional
*special problem
1900
x473
928D
Autocompletion
*special problem
,
strings
,
trees
1900
x799
656F
Ace It!
*special problem
1900
x877
928C
Dependency management
*special problem
,
graphs
,
implementation
1900
x879
784F
Crunching Numbers Just for You
*special problem
,
implementation
1900
x980
158E
Phone Talks
*special problem
,
dp
,
sortings
1900
x1448
409F
000001
*special problem
1900
x2033
656A
Da Vinci Powers
*special problem
1900
x3551
162J
Brackets
*special problem
1800
x88
100G
Name the album
*special problem
,
data structures
,
implementation
1800
x109
100F
Polynom
*special problem
,
implementation
1800
x132
683F
Reformat the String
*special problem
1800
x146
153B
Binary notation
*special problem
1800
x149
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x150
162E
HQ9+
*special problem
1800
x173
72A
Goshtasp, Vishtasp and Eidi
*special problem
,
greedy
,
math
1800
x181
683E
Hammer throwing
*special problem
1800
x187
162F
Factorial zeros
*special problem
1800
x194
162H
Alternating case
*special problem
1800
x212
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x233
188H
Stack
*special problem
,
expression parsing
,
implementation
1800
x244
470B
Hexakosioihexekontahexaphobia
*special problem
1800
x250
64D
Presents
*special problem
,
greedy
1800
x281
1910D
Remove and Add
*special problem
,
greedy
1800
x295
162B
Binary notation
*special problem
1800
x307
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x316
130J
Date calculation
*special problem
1800
x323
1571C
Rhyme
*special problem
,
implementation
1800
x357
1769D1
Игра в Девятку I
*special problem
,
brute force
,
dp
1800
x365
1488B
RBS Deletion
*special problem
,
greedy
1800
x523
409E
Dome
*special problem
1800
x562
784C
INTERCALC
*special problem
,
implementation
1800
x669
1505D
Xenolith? Hippodrome?
*special problem
,
number theory
1800
x739
162C
Prime factorization
*special problem
1800
x756
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x1131
638C
Road Improvement
*special problem
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x1479
1505E
Cakewalk
*special problem
,
greedy
,
implementation
,
shortest paths
1800
x1719
1115U3
Block unitary
*special problem
1700
x195
171H
A polyline
*special problem
,
implementation
1700
x265
130G
CAPS LOCK ON
*special problem
1700
x272
530E
Sum and product
*special problem
1700
x302
1571E
Fix the String
*special problem
,
bitmasks
,
dp
,
greedy
1700
x319
1346E
Magic Tricks
*special problem
,
dp
,
graphs
1700
x368
1001I
Deutsch-Jozsa algorithm
*special problem
1700
x396
1211C
Ice Cream
*special problem
,
greedy
,
sortings
1700
x473
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x987
929C
Красивая команда
*special problem
,
combinatorics
,
math
1700
x1141
409B
Mysterious Language
*special problem
1700
x1338
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1513
656B
Scrambled
*special problem
,
implementation
1700
x1628
409D
Big Data
*special problem
1700
x1690
409C
Magnum Opus
*special problem
1700
x1941
769C
Cycle In Maze
*special problem
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1700
x2094
769D
k-Interesting Pairs Of Integers
*special problem
,
bitmasks
,
brute force
,
meet-in-the-middle
1700
x2206
409A
The Great Game
*special problem
1700
x2432
644B
Processing Queries
*special problem
,
constructive algorithms
,
data structures
,
two pointers
1700
x2599
784A
Numbers Joke
*special problem
1700
x3104
1115G3
Palindrome checker oracle
*special problem
1600
x224
1115U2
Chessboard unitary
*special problem
1600
x227
72H
Reverse It!
*special problem
,
implementation
1600
x258
100E
Lamps in a Line
*special problem
,
math
1600
x265
130F
Prime factorization
*special problem
1600
x271
130E
Tribonacci numbers
*special problem
1600
x287
1115G2
OR oracle
*special problem
1600
x305
683C
Symmetric Difference
*special problem
1600
x314
683B
The Teacher of Physical Education
*special problem
1600
x316
188G
Array Sorting
*special problem
,
implementation
1600
x324
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x331
530D
Set subtraction
*special problem
1600
x446
130H
Balanced brackets
*special problem
1600
x475
1346D
Constructing the Dungeon
*special problem
,
graphs
,
greedy
1600
x476
530B
String inside out
*special problem
1600
x537
1001E
Distinguish Bell states
*special problem
1600
x551
1910C
Poisonous Swamp
*special problem
,
*special problem
,
implementation
,
implementation
1600
x558
1910B
Security Guard
*special problem
,
greedy
1600
x573
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