In Manthan 2011 Problem A, I first wrote a C++ code which did not compile, and it took me one minute to figure out why it did not.  I proudly declare that I am a C++ newbie.  The following is the relevant part of the code.

for (int i = 0; i < n - 1; ++i)
{
    case (order[i])
    {
    switch 'R':
        lr[i + 1] = lr[i] + 1;
        break;
    switch '=':
        lr[i + 1] = lr[i];
        break;
    switch 'L':
        lr[i + 1] = 1;
        break;
    }
}