Practice: Big Integers

Fourteen problems with whole numbers — several of them too big for an int.

For each one, ask how big the answer can get, not how big the input is:

• If the answer could pass 2 147 483 647, it goes in a long long.
• Make the calculation happen in long long too: read the inputs into long long from the start, or write 1LL * at the front of a product.
• A Wrong Answer on a big test and Accepted on the small ones is the classic sign of a value that outgrew its box.
• Two of them want the distance between two numbers, whichever is bigger: abs(a - b).