#### Project Euler 16 Problem Statement

Work out the first ten digits of the sum of the following one-hundred 50-digit numbers.

46376937677490009712648124896970078050417018260538

… {data continues}

#### Solution

Summing a set of 50-digit numbers is provided by Python’s intrinsic arbitrary-precision integers and arithmetic.

The numbers to add are saved to a file named *pe13.txt*. This keeps the data and the program separate and the process easy to comprehend.

The file is read as strings and converted to a list of integers using the `map`

function with `open`

as the iterator and `int`

as the application function:

`total = sum(map(int, open('pe13.txt')))`

.

After the end of the file is reached the list is fed to the `sum`

function which adds the integers together:

`total = sum(map(int, open('pe13.txt')))`

.

Finally, the integer sum, `total`

, is converted to a string and truncated to the top 10 digits for a solution.

#### HackerRank version

HackerRank increases the quantity of 50-digit numbers from 100 to 1,000. No changes to the program were required to handle the increase.

#### Python 2.7 Source

#### Last Word

- The file is available in the REPL window by clicking the icon.
- Also in one line:
`print "Top 10 digits of sum =", str(sum(map(int, open('pe13.txt'))))[:10]`

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