在大规模电子系统的设计中存在着电路板布线问题!这是一个很具有工程背景的难题 "因此!解决这类难题具有很大的工程意义和经济价值"但是!至今没有找到一种有效的算法在多项式时间内解决-The design of large-scale electronic systems exist in the circuit board wiring problem! This is a problem with engineering background "So! Solving such problems of great significance and economic value of the works" but! Has not yet found an effective in polynomial time algorithm to solve