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To be a valid RPN, there should be one operand in the stack (as the result of all previous operations).
t[i][k] = number of modifications on the substring of length k to get i operands in the stack
t[1][size-1] gives the answer.
* decreases the number of operands in the stack by one.
x increases the number of operands in the stack by one.
When we read a character at k, we have to decide if we should let it as it is, or if we should delete it, or insert x or insert *.
- on.celebi August 02, 2014