算法复杂度主要包括 【1】 复杂度和空间复杂度。
参考答案：时间
解析： 时间复杂度和空间复杂度是衡量算法好差的重要指标。
______, but he couldn’t understand the logical connection of the two subjects.
A．Having told many times
B．Having been told many times
C．He had been told many times
D．Many times as he was told
短周期元素 X 和 Y 可以形成 XY4型化合物, 若 X 的原子序数为 m , Y 的原子序数为 n , 则 m 和n 的相互关系不可能为
A．m – 13 = n
B．n + 5 = m
C．m + 8 = n
D．n – 11 =" m"
