[-2.5,4,0,3,0.5,8,-1]
12.00000
取连续子数组[3,0.5,8]可得累乘的最大乘积为12.00000
[1.0,0.0,0.0]
1.00000
取连续子数组[1.0]可得累乘的最大乘积为1.00000