求解網絡中的最短路徑。假設某個計算機網絡有n個站點,依次編號為1,2,…,n;有的站點之間有直接的線路連接(即這兩個站點之間沒有其它站點),有的站點之間沒有直接的線路連接。如果用三元組(i,j,f)來表示該網絡中的站點I和站點j之間有直接的線路連接且它們之間的距離為f 當已知該網絡各站點之間的直接連接情況由m個三元組(i1,j1,f1),(i2,j2,f2),…,(im,jm,fm)確定時,要求計算出對于網絡中任意一個站點g(1≤g≤n)到其余各站點的最短距離。
標簽:
網絡
最短路徑
站點
計算機網絡
上傳時間:
2013-12-27
上傳用戶:asdkin
The government of a small but important country has decided that the alphabet needs to be streamlined and reordered. Uppercase letters will be eliminated. They will issue a royal decree in the form of a String of B and A characters. The first character in the decree specifies whether a must come ( B )Before b in the new alphabet or ( A )After b . The second character determines the relative placement of b and c , etc. So, for example, "BAA" means that a must come Before b , b must come After c , and c must come After d .
Any letters beyond these requirements are to be excluded, so if the decree specifies k comparisons then the new alphabet will contain the first k+1 lowercase letters of the current alphabet.
Create a class Alphabet that contains the method choices that takes the decree as input and returns the number of possible new alphabets that conform to the decree. If more than 1,000,000,000 are possible, return -1.
Definition
標簽:
government
streamline
important
alphabet
上傳時間:
2015-06-09
上傳用戶:weixiao99