Wednesday, November 30, 2011
Tuesday, November 29, 2011
Given a number 123456789 and two opearators + and *. You have also given value k , You have to find all the such expressions that evaluates and value is equal to the given value.
Given a number 123456789 and two opearators + and
*. You can use this two operators as many times u want. But you cant
change the sequence of the number given there. The evaluated value is
2097.
e.g. 1+2+345*6+7+8+9=2097
You have to find all the such expressions that evaluates and value is
equal to the given value. You can use concatenation of numbers like 345 is concatenated there.
e.g. some more example
1+2+345*6+7+8+9 = 2097
12*3*45+6*78+9 = 2097
12*34+5*6*7*8+9 = 2097
e.g. 1+2+345*6+7+8+9=2097
You have to find all the such expressions that evaluates and value is
equal to the given value. You can use concatenation of numbers like 345 is concatenated there.
e.g. some more example
1+2+345*6+7+8+9 = 2097
12*3*45+6*78+9 = 2097
12*34+5*6*7*8+9 = 2097
Given an image that is represented by Nx1000 matrix of binary numbers. 1 represents black(image ink) and 0 represents white(blank).,Return all the positions of the pixels where you break the page and the number of pages, so that the image can be printed in the minimum number of pages.
Given an image that is represented by Nx1000
matrix of binary numbers. 1 represents black(image ink) and 0 represents
white(blank).
The page breaks are applied in two ways:
1.)Find the row with all the white pixels.
(But this selection should be efficient as we want to print in minimum no. of pages.
For example: if we get a white line on 200th row, 600th row and 900th row, we should choose 900th line to break page).
2.) If no such row exists, break on the 1000th line.
Return all the positions of the pixels where you break the page and the number of pages, so that the image can be printed in the minimum number of pages.
The page breaks are applied in two ways:
1.)Find the row with all the white pixels.
(But this selection should be efficient as we want to print in minimum no. of pages.
For example: if we get a white line on 200th row, 600th row and 900th row, we should choose 900th line to break page).
2.) If no such row exists, break on the 1000th line.
Return all the positions of the pixels where you break the page and the number of pages, so that the image can be printed in the minimum number of pages.
Devise an algorithm for maximizing the sum of the randomly selected elements from the k subarrays. Basically means that we will want to split the array in such way such that the sum of all the expected values for the elements selected from each subarray is maximum.
You have an array with *n* elements. The elements are either 0 or 1. You
want to *split the array into kcontiguous subarrays*. The size of each
subarray can vary between ceil(n/2k) and floor(3n/2k). You can assume that
k << n. After you split the array into k subarrays. One element of each
subarray will be randomly selected.
Devise an algorithm for maximizing the sum of the randomly selected
elements from the k subarrays. Basically means that we will want to split
the array in such way such that the sum of all the expected values for the
elements selected from each subarray is maximum.
You can assume that n is a power of 2.
Example:
Array: [0,0,1,1,0,0,1,1,0,1,1,0]
n = 12
k = 3
Size of subarrays can be: 2,3,4,5,6
Possible subarrays [0,0,1] [1,0,0,1] [1,0,1,1,0]
Expected Value of the sum of the elements randomly selected from the
subarrays: 1/3 + 2/4 + 3/5 = 43/30 ~ 1.4333333
Optimal split: [0,0,1,1,0,0][1,1][0,1,1,0]
Expected value of optimal split: 1/3 + 1 + 1/2 = 11/6 ~ 1.83333333
Source -> http://stackoverflow.com/ questions/8189334/google- combinatorial-optimization- interview-problm
want to *split the array into kcontiguous subarrays*. The size of each
subarray can vary between ceil(n/2k) and floor(3n/2k). You can assume that
k << n. After you split the array into k subarrays. One element of each
subarray will be randomly selected.
Devise an algorithm for maximizing the sum of the randomly selected
elements from the k subarrays. Basically means that we will want to split
the array in such way such that the sum of all the expected values for the
elements selected from each subarray is maximum.
You can assume that n is a power of 2.
Example:
Array: [0,0,1,1,0,0,1,1,0,1,1,0]
n = 12
k = 3
Size of subarrays can be: 2,3,4,5,6
Possible subarrays [0,0,1] [1,0,0,1] [1,0,1,1,0]
Expected Value of the sum of the elements randomly selected from the
subarrays: 1/3 + 2/4 + 3/5 = 43/30 ~ 1.4333333
Optimal split: [0,0,1,1,0,0][1,1][0,1,1,0]
Expected value of optimal split: 1/3 + 1 + 1/2 = 11/6 ~ 1.83333333
Source -> http://stackoverflow.com/
Labels:Data
Facebook Interview
,
Google Interview
Saturday, November 26, 2011
SMS Problem
1 - NULL, 2 - ABC, 3 - DEF, 4 - GHI, 5 - JKL, 6 - MON, 7 - PQRS, 8 - TUV, 9 - WXYZ, * - <Space>, # - <Break>
We must convert the numbers to text.
Eg
I/P - O/P
22 - B
23 - AD
223 - BD
22#2 - BA (# breaks the cycle)
3#33 - DE
2222 - 2
2222#2 - 2A
22222 - A (cycle must wrap around)
222222 - B
We must convert the numbers to text.
Eg
I/P - O/P
22 - B
23 - AD
223 - BD
22#2 - BA (# breaks the cycle)
3#33 - DE
2222 - 2
2222#2 - 2A
22222 - A (cycle must wrap around)
222222 - B
Labels:Data
EPIC System
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