Top Solder层,就是用来控制做板的时候不覆盖绿油(白油)的区域,比如焊盘的位置,一些关键信号的测试点,不覆盖绿油,才能漏出焊盘。如果你在焊盘的位置不包含Top Solder层,则焊盘会盖上…
E. Vanya and Brackets time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Vanya is doing his maths homework. He has an expression of form , where x1, x2, ..., xn are digits from 1 to 9, and sign …