【题解】
找一下两个面积s1,s2的2和3的因子数，把他们除掉，如果s1,s2不相等，就是-1，否则可以用s1,s2的2和3的因子数计算答案。
1 #include<cstdio> 2 #include<algorithm> 3 #define LL long long 4 #define rg register 5 using namespace std; 6 LL t1,t2,a2,a3,b2,b3,ans; 7 inline int read(){ 8 int k=0,f=1; char c=getchar(); 9 while(c<'0'||c>'9')c=='-'&&(f=-1),c=getchar(); 10 while('0'<=c&&c<='9')k=k*10+c-'0',c=getchar(); 11 return k*f; 12 } 13 int main(){ 14 t1=1ll*read()*read(); t2=1ll*read()*read(); 15 while(t1%2==0) a2++,t1>>=1; 16 while(t1%3==0) a3++,t1/=3; 17 while(t2%2==0) b2++,t2>>=1; 18 while(t2%3==0) b3++,t2/=3; 19 if(t1!=t2){ 20 puts("-1"); return 0; 21 } 22 ans=abs(a3-b3); 23 if(a3<b3) b2+=ans; else a2+=ans; 24 ans+=abs(a2-b2); 25 printf("%lld ",ans); 26 return 0; 27 }