1, the removal of large numbers: 1, matrix multiplication, the same transfer form. (1, push function, such as Fibonacci, 2, optimization DP)
2, modulo thought. Such as: cycling festival.
2, T2 [la] [lb] There are too many invalid two-dimensional section. The AC node removes invalid state automaton.
3, it is seen some properties, while after some processing guessed network flow. But he did not want to continue in-depth.
Correct answer is to construct, build the model. Thinking starting point for construction. Using the properties.
Time plan: a simple question try to think positive solution, the problem of violence hit the best.
Try to order.
10 minutes is not a question of ideas, so after direct violence go, do not delay the overall time.
Aspect meter time.
Angle: 1, looking in nature. Guess properties. (Test 79: T2 cycloalkyl) 2, the configuration of the model (graph theory) (T3)
3, data range. Guess practice framework. 4, sexual routine before seen similar problems.
Do not change the title card is often a waste of time.