打卡交作业。这节课人真多呀。

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#1 Created at ... [Delete] [Delete and Lock User]

for(int i = 0;i<list.size();i++){
    if(list.get(i) != start)
        return start;
    start++;
}
return 0;

for(int i = start;i<=end;i++){
    if(!list.contains(i))
        return i;    
}
return 0;

#2 Created at ... [Delete] [Delete and Lock User]

第一种解法，当缺失的数字为20时会测试失败

#3 Created at ... [Delete] [Delete and Lock User]

return 0 改成return 20就行了吧