作为我正在解决的一个大问题的一部分,我很好奇是否有可能在线性时间内完成以下操作:
生成映射:
{a_0, a_1, ..., a_n-1}
生成映射:
f(i,j): sum of elements over range [i,j) for all i,j in {0, 1, ..., n - 1}
e.g.
{ 5, 1, 89, 0 }
---->
f(0,1) = 5
f(0,2) = 5 + 1 = 6
f(0,3) = 5 + 1 + 89 = 95
f(0,4) = 5 + 1 + 89 + 0 = 95
f(1,2) = 1
f(1,3) = 1 + 89 = 90
f(1,4) = 1 + 89 + 0 = 90
f(2,3) = 89
f(2,4) = 89 + 0 = 89
f(3,4) = 0