AC_Meiko的博客

You are given n strings s1, s2, ..., sn. Each of these strings consists only of letters 'a' and 'b', and the length of each string can be at most 2. In other words, the only allowed strings are "a", "...

题目链接：http://acm.hdu.edu.cn/showproblem.php?pid=6298题意分析：求xyz在满足x+y+z=n并且x|n，y|n，z|n的情况下的最大值；设t=n/x，s=n/y，r=n/z所以x=n/t，y=n/s，z=n/r代入 x+y+z=n 中 同除n化简得1/t+1/s+1/r=1并且t,s,r都为整数该不定方程的整数解只有如下三...