- For contest that gives penalties on wrong submissions, try to test edge cases first before submitting. The obvious ones include: array size of 1, inputs of 1, 0, or -1, etc.
- If you are trying to improve your rating, try to finish problems quickly without wrong submissions. Even though you can't solve the harder ones, the ranking will still be good.
- Whenever you see problems in sequence (Q1: xxx I, Q2: xxx II), see them both first. If the second one is just a slight modification of the first one on data constraints, try solving the second one first. and the first one will definitely pass.