missingnumbers

Missing Numbers

ID: missingnumbers

Difficulty: 1.5

CPU Time: 1 second

Memory: 1024 MB

Solution

For this, one could keep a list of all the numbers recited and then iterate through it and find all the missing ones, but what one can do to output/check as they're first read is have an expected value, and begin it at 1, and as the numbers are read, if the number is not the expected value, output everything up to that number just read. After that (or even if there is no error), set the expected next value to be the just-read number + 1.