题目内容

稀疏矩阵的一般的压缩方法有( )。

A. 二维数组
B. 广义表
C. 三元组表
D. 一维数组

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设矩阵A是一个对称矩阵,a11是首元素,为了节省空间,将其下三角部分按行优先存放在一维数组B中,对下三角矩阵中任一元素aij(i≥j),在一维数组B中下标K的值是( )。

A. i(i-1)/2+j-1
B. i(i-1)/2+j
C. i(i+1)/2+j-1
D. i(i+1)/2+j

对稀疏矩阵进行压缩存储是为了( )。

A. 便于进行矩阵运算
B. 便于输入和输出
C. 节约存储空间
D. 降低运算的时间复杂度

C. DraftingFirst draft(初稿):Use the information in your outline above to write thefirst draft.【Remember to use the expressions learned to state problems and propose solutions.】

E. Final draft（终稿）：Choosean environmental issueand propose how people can help improve the situation.Givethree solutions.Instructions:1. use the simple present;2. have a clear topic sentence;3. have three solutions to the given problem;4. include one detail for each supporting idea;4. write 55-100 words.Your paragraph will bescoredbased on:content (topic sentence and supporting ideas);grammar (problem/solution expressions);completed sentence (SVO);vocabulary (words in Unit 4);spelling, punctuation, and capitalization.