#include
     
      #include
      
       #include
       
        const int Len=5000//大数的长度using namespace std;int Input (char n[])//将大数读入的函数{    char s[Len];    int l;    for(int i=0; i
        
         0; i--)        if(n[i]!=0) break;    for(; i>=0; i--)        printf("%d",n[i]);    printf("\n");}void Add (char a[],char b[],char c[])//大数加法{    int i=0;    for(i=0; i
         
          =10)        {            c[i+1]+=c[i]/10;            c[i]=c[i]%10;        }    }}void Mul(char a[],char b[],char c[])//大数乘法{    int i,j;    int alen=strlen(a),blen=strlen(b);    for(i=0; i
          
           =10) { c[i+j+1]+=c[i+j]/10; c[i+j]%=10; } }}int main(){ char a[Len],b[Len],c[Len]; Input(a); Input(b); Add(a,b,c); Print(c); Mul(a,b,c); Print(c); return 0;}