凡是差分约束系统的题目都是转化为d[j]-d[i]<=w[i,j]的形式然后我们建立边i-->j 边权为w[i,j]对于这道题,要求d[n]-d[1]尽可能的大设d[i]为相对差,d[1]=0,我们只要跑1-->n的最短路即可(为什么是最短路呢?实在不明白简单举一个例子即可)由于这道题边不存在负权,所以我们用dij+heap更合适 ; type link=^node; node=record po,len:longint; next:link; end; point=record num…

Lucky Coins Sequence Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 608 Accepted Submission(s): 319 Problem Description As we all know,every coin has two sides,with one side facing up and another…