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Contest 2050 and Codeforces Round #718 (Div. 1 + Div. 2)
36:16:58
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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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Custom test
Problems
#
Name
470F
Pairwise Sums
*special problem
2300
x88
470E
Chessboard
*special problem
1900
x176
470D
Caesar Cipher
*special problem
1900
x132
470C
Eval
*special problem
1900
x157
470B
Hexakosioihexekontahexaphobia
*special problem
1800
x239
470A
Crystal Ball Sequence
*special problem
,
implementation
1400
x480
411A
Password Check
*special problem
,
implementation
800
x4571
409I
Feed the Golorp
*special problem
2400
x81
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x5695
409G
On a plane
*special problem
,
geometry
2200
x351
409F
000001
*special problem
1900
x1603
409E
Dome
*special problem
1800
x456
409D
Big Data
*special problem
1700
x1235
409C
Magnum Opus
*special problem
1700
x1661
409B
Mysterious Language
*special problem
1700
x1150
409A
The Great Game
*special problem
1700
x2054
345G
Suffix Subgroup
*special problem
,
strings
2200
x39
345F
Superstitions Inspection
*special problem
2700
x35
345E
Black Cat Rush
*special problem
2700
x34
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x69
345C
Counting Fridays
*special problem
2000
x111
345B
Triskaidekaphobia
*special problem
2100
x113
345A
Expecting Trouble
*special problem
,
probabilities
1500
x379
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1037
291D
Parallel Programming
*special problem
,
greedy
1600
x1395
291C
Network Mask
*special problem
,
bitmasks
,
brute force
,
implementation
1600
x1593
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x2748
291A
Spyke Talks
*special problem
,
implementation
,
sortings
800
x4846
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x82
290E
HQ
*special problem
,
constructive algorithms
2500
x144
290D
Orange
*special problem
,
implementation
1400
x1547
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1155
290B
QR code
*special problem
,
implementation
1500
x2019
290A
Mysterious strings
*special problem
,
implementation
1400
x2500
188H
Stack
*special problem
,
expression parsing
,
implementation
1800
x182
188G
Array Sorting
*special problem
,
implementation
1600
x168
188F
Binary Notation
*special problem
,
implementation
1400
x231
188E
HQ9+
*special problem
,
implementation
1400
x257
188D
Asterisks
*special problem
,
implementation
1100
x323
188C
LCM
*special problem
,
implementation
,
math
1400
x319
188B
A + Reverse B
*special problem
,
implementation
1300
x367
188A
Hexagonal Numbers
*special problem
1100
x474
172E
BHTML+BCSS
*special problem
,
dfs and similar
,
expression parsing
2200
x242
172D
Calendar Reform
*special problem
,
number theory
1500
x1165
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1010
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2132
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x4139
171H
A polyline
*special problem
,
implementation
1700
x185
171G
Mysterious numbers - 2
*special problem
1600
x570
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x941
171E
MYSTERIOUS LANGUAGE
*special problem
2000
x816
171D
Broken checker
*special problem
,
brute force
1300
x1882
171C
A Piece of Cake
*special problem
,
implementation
2000
x683
171B
Star
*special problem
,
combinatorics
1300
x2774
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x3038
162J
Brackets
*special problem
1800
x62
162I
Truncatable primes
*special problem
2000
x50
162H
Alternating case
*special problem
1800
x61
162G
Non-decimal sum
*special problem
2000
x38
162F
Factorial zeros
*special problem
1800
x132
162E
HQ9+
*special problem
1800
x154
162D
Remove digits
*special problem
1900
x196
162C
Prime factorization
*special problem
1800
x157
162B
Binary notation
*special problem
1800
x286
162A
Pentagonal numbers
*special problem
,
implementation
1100
x578
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x890
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x3612
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2363
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3066
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2170
158E
Phone Talks
*special problem
,
dp
,
sortings
1900
x1333
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x5637
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x6439
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x50338
158A
Next Round
*special problem
,
implementation
800
x108268
153E
Euclidean Distance
*special problem
2100
x54
153D
Date Change
*special problem
2000
x63
153C
Caesar Cipher
*special problem
2200
x74
153B
Binary notation
*special problem
1800
x129
153A
A + B
*special problem
1600
x261
130J
Date calculation
*special problem
1800
x97
130I
Array sorting
*special problem
,
sortings
2300
x118
130H
Balanced brackets
*special problem
1600
x231
130G
CAPS LOCK ON
*special problem
1700
x196
130F
Prime factorization
*special problem
1600
x199
130E
Tribonacci numbers
*special problem
1600
x210
130D
Exponentiation
*special problem
1500
x291
130C
Decimal sum
*special problem
1500
x388
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x404
130A
Hexagonal numbers
*special problem
,
implementation
900
x778
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x41
100I
Rotation
*special problem
,
geometry
,
math
1500
x190
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x55
100G
Name the album
*special problem
,
data structures
,
implementation
1800
x79
100F
Polynom
*special problem
,
implementation
1800
x108
100E
Lamps in a Line
*special problem
,
math
1600
x132
100D
World of Mouth
*special problem
,
strings
1500
x250
100C
A+B
*special problem
,
implementation
1400
x366
100B
Friendly Numbers
*special problem
,
implementation
1500
x221
100A
Carpeting the Room
*special problem
,
implementation
1100
x567
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