While this problem is indeed easy, what you described is a greedy algorithm and won't give you the most optimal solution and, specifically, could give you a dif

While this problem is indeed easy, what you described is a greedy algorithm and won't give you the most optimal solution and, specifically, could give you a different solution if you shuffled the shreds, which shouldn't be happening. Hint: very often, when you think "isn't it extremely obvious?", you've come up with a greedy algorithm and it's not the right one. :)