Processing datasets
The goal of the following exercises is similar. You have
to read some mixed datasets of int values from cin and process them. Luckily,
each data value is preceded by the identififier of the dataset it belongs to, and
there are only two datasets, identifified by a and b. You have to read values until
the input provides no more (no explicit stop input is provided). The datasets
can be of difffferent sizes.
Exercise 1: Read the datasets and write them into cout in the following order:
fifirst by dataset (fifirst a, then b) and then by value. Example:
input: a 3 b 2 b 1 a 1 a 4 b 2
output: 1 3 4 1 2 2
Exercise 2: Read the datasets and write them into cout in the following order:
fifirst the 1st read value of dataset a (if any), then the 1st read value from
dataset b (if any), then the 2nd read value from the dataset a (if any),
then the 2nd read value from dataset b (if any), etc. Example:
input: a 3 b 2 b 1 a 1 a 4 b 2
output: 3 2 1 1 4 2
Exercise 3: Read the datasets. Interpret each dataset as a vector (in the
order provided by the input) and compute their scalar product. If one
of the vectors is shorter than the other, the missing dimensions are to be
considered as having value 0. Example:
input: a 3 b 2 b 1 a 1 a 4 b 2
output: 15
which is obtained from (3, 1, 4) × (2, 1, 2) = 3 · 2 + 1 · 1 + 4 · 2
Hints Use one vector container to store each dataset. Load the datasets into
the vectors fifirst, and process them later. Use the documentation of vector:
http://en.cppreference.com/w/cpp/container/vector
http://www.cplusplus.com/reference/vector/vector/
Challenge
Consider the more general case of an unknown arbitrary number
of data sets.
