Mock CCC '18 Contest 1 Junior

This is the first contest in a series of mock CCC contests produced and tested by ksun48, rpeng, xiaowuc1, and y0105w49.

Much like the real CCC, you will have 3 hours to do 5 problems with full feedback. You may submit no more than 50 submissions per problem. Additionally, the scoreboard will be disabled during the contests.

There are no explicit subtasks included in the problem statements: each test case is 1 point.

Unlike with other contests, these problems contain no flavortext.

This contest will not be rated.