Leetcode Problem 439. Ternary Expression Parser
Leetcode Solutions
Approach: Reverse Polish Notation using Stack
- Initialize an empty stack.
- Traverse the expression from right to left.
- If the current character is a digit, 'T', or 'F', push it onto the stack.
- If the current character is '?', pop the top two elements from the stack as operands.
- Check the condition (the character before '?').
- If the condition is 'T', push the first operand back onto the stack.
- If the condition is 'F', push the second operand back onto the stack.
- Skip the next character (which should be ':').
- Continue the traversal until all characters are processed.
- The last element remaining on the stack is the result.
Approach: Constant Space Solution
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