牛客 华科J 题 - Mex ( 思维/前缀和 )

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一、问题：

Description

链接：https://ac.nowcoder.com/acm/contest/700/J
来源：牛客网
 

Recently MINIEYE's engineer M is working on neural network model training and he has found that if the output of the network is S = (S1, S2, …, Sn), then we can use mex(S) to predict the total training time of the neural network. Define mex(S) as:

Here S