help writing an algorithm

Question

i need to write algo for this problem. i have never written an algo before . please correct me.

there is a list which contains four collumns each with numbers with upto 5 digits and about 10 rows in total. we have to remove the rows containng any number with less than 3 digits. here is how i have tried

1. read list into multi-dimensional array
2. for each number in the array if numdigits < 3 delete all numbers of that row

i know this is not the correct algorithm . can you help me correct it .

Answer 1

With up to 5 digits in total in each column? If so here is what I would do.

For each row in list

    For each column in row

        if column number < 100 then
        row delete

Answer 2

When creating your original list, rather check the individual values then, and not add it to that list if any of the numbers has less than 3 digits, that way reducing the original list size.

EDIT:

foreach row in original_document
{
    bool allMoreThan3Digits = true
    foreach cell in row
     allMoreThan3Digits = allMoreThan3Digits && (ABS(cell.Value) >= 100)

    if (allMoreThan3Digits)
     add row to new list
}

Something like that.