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我的代码我考虑的是b,c其中一个肯定不大于2*a,b和c相差越少越好,所以从2*a开始找能整除的,找到就是相差差最少的,也就是和最小的
#include <stdio.h>
#include <cmath>
int main()
{
__int64 a,b,c;
while(scanf("%I64d",&a)!=EOF)
{
b=2*a;
while((a*b+1)%(b-a)!=0) b--;
c=(a*b+1)/(b-a);
c=b+c;
printf("%I64d\n",c);
}
return 0;
}
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