#include<iostream> #include<algorithm> #include<cstdio> #include<queue> #include<stack> #include<cstring> using namespace std; int t[10]; void chai(int x){ while(x){ t[x%10]++; x/=10; } return; } int main(){ for(int a=10;a<=99;a++){ for(int b=a;b<=99;b++){ for(int c=10;c<=99;c++){ int d=a*b/c; if(c*d!=a*b)continue; memset(t,0,sizeof(t)); chai(a);chai(b);chai(c);chai(d); if(t[0]>0)continue; bool flag=true; for(int i=1;i<=9;i++){ if(t[i]==0||t[i]>1){ flag=false; break; } } if(flag){ printf("%d x %d = %d x %d\n",a,b,c,d); } } } } return 0; } /* #include<cstdio> freopen("文件名.in","r",stdin); freopen("文件名.out","w",stdout); */