代码语言：javascript复制
#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
int main(){
string a,b,c;
int length_a,length_b;
cin>>a;
cin>>b;
length_a=a.length();
length_b=b.length();
reverse(a.begin(),a.end());
reverse(b.begin(),b.end());
if(length_a>=length_b)
{
for(int i=0;i<(length_a-length_b);i )
{
b.append(1,'0');
}
}
else
{
for(int i=0;i<(length_b-length_a);i )
{
a.append(1,'0');
}
}
cout<<a<<endl;
cout<<b<<endl;
if(length_a>=length_b)
{
for(int i=0;i<length_a;i )
{
a[i]-='0';
b[i]-='0';
if((a[i] b[i])>=10)
{
c.append(1,(a[i] b[i]));
a[i 1] ;
c[i] ='0';
}
else
{
c.append(1,a[i] b[i]);
c[i] ='0';
}
}
}
else
{
for(int i=0;i<length_b;i )
{
a[i]-='0';
b[i]-='0';
if((a[i] b[i])>=10)
{
c.append(1,(a[i] b[i]));
b[i 1] ;
c[i] ='0';
}
else
{
c.append(1,a[i] b[i]);
c[i] ='0';
}
}
}
reverse(c.begin(),c.end());
int length_c=c.length();
cout<<c;
}时间复杂度O(n);
