Be careful about the upper limit of integer
在面对整数时,要留心整数溢出的情况。
在探索一个数有多少个除数的程序中,原本我们只要累加自然数到大于根号N停止即可。
不过因为计算机的整数范围的限制,我们需要判断是否i*i<(i-1)*(i-1)。
如果发生这种情况,说明整数溢出了~
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