剑不飞

摘要： Given a sequence of integers,a1,a2,...,an, we define itssign matrix Ssuch that, for1ijn,Sij= `` + "ifai+...+aj> 0;Sij= `` - "ifai+...+ajf[i-1],f[j] #include #include #include using namespace std; const int mm=15; vector g[mm]; int id[mm],f[mm],ans[mm]; int cas,n; void get(int n) { char 阅读全文

摘要： Problem B: Fire!Joe works in a maze. Unfortunately, portions of the maze have caught on fire, and the owner of the maze neglected to create a fire escape plan. Help Joe escape the maze.Given Joe's location in the maze and which squares of the maze are on fire, you must determine whether Joe can 阅读全文