C. PRODUCT OF THREE NUMBERS[等式枚举优化]
http://www.yyycode.cn/index.php/2020/05/17/c-product-of-three-numbers%e7%ad%89%e5%bc%8f%e6%9e%9a%e4%b8%be%e4%bc%98%e5%8c%96/You are given one integer numbernn. Find threedistinct integersa,b,ca,b,csuch that2≤a,b,c2≤a,b,canda⋅b⋅c=na⋅b⋅c=nor say th...