Strategy Don't trust the writer
This is not really much of a strategy, this is something you should do while reading a problem, whenever you see a constraint in the problem statement that a solution must satisfy revisit this constraint, asking yourself do I really need to care about this ? Many times writers add more stuff to the problem statement to confuse people or make the problem harder to solve.
Strategy Think backwards think in reverse!
Many problems are easier when solved backwards, or maybe impossible to solve if attacked in the straight forward way.
Strategy Special points in the search space
This strategy is usually applied when the search space is too large or infinite so it can’t be searched, it’s often used in geometry problems because usually the search space there is infinite, it can also be used to make your solution a lot simpler.
Strategy simplify the problem
This one is a very useful strategy and should always be applied while trying to approach a specific problem, however it might or might not work!