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You are given an array of up to four non-negative integers, each less than 256.
Your task is to pack these integers into one number M in the following way:
The first element of the array occupies the first 8 bits of M;
The second element occupies next 8 bits, and so on.
Return the obtained integer M.
Note: the phrase "first bits of M" refers to the least significant bits of M - the right-most bits of an integer. For further clarification see the following example.
Example
For a = [24, 85, 0], the output should be
arrayPacking(a) = 21784.
An array [24, 85, 0] looks like [00011000, 01010101, 00000000] in binary.
After packing these into one number we get 00000000 01010101 00011000 (spaces are placed for convenience), which equals to 21784.
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code>>
int arrayPacking(vector<int> a) {
auto result = 0;
for(int i=0; i< a.size(); ++i)
{
result += a[i] << i * 8;
}
return result;
}