87：
T2: the slope of the convex hull of the blind, but it does not seem to have a monotonic? -30
88：
T1: height did not read the apparent limit of 140 to 170, direct discretization n ^ 2.
Optimization or optimizing expression very significant slope.
Rather than think about fake greedy. But not without just T1. Originally considered the slope formula was wrong, that is not monotonous. The original formula. -55
T3: Small number of balls thought the same equivalent effect. Similar liyudong original title cards.
Rather than blindly like pressure. -30
89：
T1: to simplify the meaning of the questions did not come out. Plus and minus to plus is equivalent after the first reduction. Reduced state, transforming the meaning of problems. -70
T3：{sign(x,1)return w;sign(x,-1);}低级错误。没想清楚。-60
90:
T2: a differential pressure state. Only records whether the left point. -70
Outline-like first press the wrong solution. And not just T2, T3 violence but to do it, but T3 target actual 60 30. Waste a lot of time.
Just a simple question to go, the challenge to fight violence.
Do not waste time on the card and often nonsense.
91：
T1: not seen properties: different kinds of pile does not exceed a root directly linked list.
T2: fried not count points. See positive solution, but the auxiliary array DP was wrong. DP can be placed in each recursive each current count.
92：
T1: There are no examples issued to shoot. Feel difficult to write to beat violence. The actual good writing. The results explode. -70.
This uncertainty is absolutely necessary to break out of a shot.
noip can not hang points, so write to beat, so usually have to test.
Another idea is to simplify the number of cases, so very good fight.