erase

Erase Securely

ID: erase

Difficulty: 1.8

CPU Time: 1 second

Memory: 1024 MB

Solution

For this, since each bit is handled completely independently from the others, and is simply flipped, an even number of flips should not change the bit, and an odd number should. Iterate through both strings in parallel, and if N % 2 == 0 and the bits are different, or N % 2 != 0 and the bits aren't different, there is an error.