Shobute 🍻

Project-Euler / 13

Problem 13 asks:

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

Here’s my solution in Java, I left out a lot of the numbers for clarity’s sake:

public class Problem13 {
    private static double[] NUMS = {
        37107287.533902102798797998220837590246510135740250,
        46376937.677490009712648124896970078050417018260538,
        /* 96 other numbers go here... */
        20849603.980134001723930671666823555245252804609722,
        53503534.226472524250874054075591789781264330331690
    };
    public static void main(String[] args) {
        double sum = 0;
        for (double num : NUMS) sum += num;
        System.out.println((long)sum);
    }
}

It almost feels like cheating by storing the numbers as doubles but it works well because precision is not important and by putting the decimal point after 8 digits I end up with 10 digits after adding together 10² of them.