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Before contest
Codeforces Round 986 (Div. 2)
10:16:57
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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
530I
Different variables
*special problem
2500
x47
530H
Points in triangle
*special problem
,
geometry
2100
x123
530G
Levenshtein distance
*special problem
2100
x158
530F
Jumping frogs
*special problem
2100
x101
530E
Sum and product
*special problem
1700
x308
530D
Set subtraction
*special problem
1600
x452
530C
Diophantine equation
*special problem
1500
x556
530B
String inside out
*special problem
1600
x542
530A
Quadratic equation
*special problem
1500
x675
523D
Statistics of Recompressing Videos
*special problem
,
data structures
,
implementation
1600
x2348
523C
Name Quest
*special problem
,
greedy
1400
x2501
523B
Mean Requests
*special problem
,
implementation
1500
x952
523A
Rotate, Flip and Zoom
*special problem
,
implementation
1200
x2636
522D
Closest Equals
*special problem
,
data structures
2000
x3230
522B
Photo to Remember
*special problem
,
data structures
,
dp
,
implementation
1100
x8903
522A
Reposts
*special problem
,
dfs and similar
,
dp
,
graphs
,
trees
1200
x16480
470H
Array Sorting
*special problem
2300
x189
470G
Hamming Distance
*special problem
2300
x95
470F
Pairwise Sums
*special problem
2300
x106
470E
Chessboard
*special problem
1900
x198
470D
Caesar Cipher
*special problem
1900
x153
470C
Eval
*special problem
1900
x255
470B
Hexakosioihexekontahexaphobia
*special problem
1800
x260
470A
Crystal Ball Sequence
*special problem
,
implementation
1400
x677
411A
Password Check
*special problem
,
implementation
800
x7270
409I
Feed the Golorp
*special problem
2400
x127
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8943
409G
On a plane
*special problem
,
geometry
2200
x521
409F
000001
*special problem
1900
x2092
409E
Dome
*special problem
1800
x578
409D
Big Data
*special problem
1700
x1715
409C
Magnum Opus
*special problem
1700
x1980
409B
Mysterious Language
*special problem
1700
x1358
409A
The Great Game
*special problem
1700
x2468
345G
Suffix Subgroup
*special problem
,
strings
2200
x55
345F
Superstitions Inspection
*special problem
2700
x47
345E
Black Cat Rush
*special problem
2700
x47
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x79
345C
Counting Fridays
*special problem
2000
x126
345B
Triskaidekaphobia
*special problem
2100
x125
345A
Expecting Trouble
*special problem
,
probabilities
1500
x491
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1315
291D
Parallel Programming
*special problem
,
greedy
1600
x1478
291C
Network Mask
*special problem
,
bitmasks
,
brute force
,
implementation
1600
x1682
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3032
291A
Spyke Talks
*special problem
,
implementation
,
sortings
800
x6101
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x134
290E
HQ
*special problem
,
constructive algorithms
2500
x205
290D
Orange
*special problem
,
implementation
1400
x1804
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1548
290B
QR code
*special problem
,
implementation
1500
x2446
290A
Mysterious strings
*special problem
,
implementation
1400
x3004
188H
Stack
*special problem
,
expression parsing
,
implementation
1800
x266
188G
Array Sorting
*special problem
,
implementation
1600
x334
188F
Binary Notation
*special problem
,
implementation
1400
x301
188E
HQ9+
*special problem
,
implementation
1400
x500
188D
Asterisks
*special problem
,
implementation
1100
x682
188C
LCM
*special problem
,
implementation
,
math
1400
x453
188B
A + Reverse B
*special problem
,
implementation
1300
x735
188A
Hexagonal Numbers
*special problem
1100
x778
172E
BHTML+BCSS
*special problem
,
dfs and similar
,
expression parsing
2200
x271
172D
Calendar Reform
*special problem
,
number theory
1500
x1399
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1146
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2781
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x6155
171H
A polyline
*special problem
,
implementation
1700
x282
171G
Mysterious numbers - 2
*special problem
1600
x932
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1284
171E
MYSTERIOUS LANGUAGE
*special problem
2000
x1466
171D
Broken checker
*special problem
,
brute force
1300
x2580
171C
A Piece of Cake
*special problem
,
implementation
2000
x1095
171B
Star
*special problem
,
combinatorics
1300
x4070
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4481
162J
Brackets
*special problem
1800
x96
162I
Truncatable primes
*special problem
2000
x77
162H
Alternating case
*special problem
1800
x220
162G
Non-decimal sum
*special problem
2000
x65
162F
Factorial zeros
*special problem
1800
x202
162E
HQ9+
*special problem
1800
x178
162D
Remove digits
*special problem
1900
x228
162C
Prime factorization
*special problem
1800
x805
162B
Binary notation
*special problem
1800
x313
162A
Pentagonal numbers
*special problem
,
implementation
1100
x804
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x1001
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4319
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2994
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3804
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2483
158E
Phone Talks
*special problem
,
dp
,
sortings
1900
x1461
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6249
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x9239
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x87613
158A
Next Round
*special problem
,
implementation
800
x252138
153E
Euclidean Distance
*special problem
2100
x80
153D
Date Change
*special problem
2000
x83
153C
Caesar Cipher
*special problem
2200
x391
153B
Binary notation
*special problem
1800
x157
153A
A + B
*special problem
1600
x822
130J
Date calculation
*special problem
1800
x341
130I
Array sorting
*special problem
,
sortings
2300
x167
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