1ac 2,3都wa 4,5更离谱 直接re

#include<bits/stdc++.h>
using namespace std;
int main()
{
	char a1[100],b1[100];
	int a[100],b[100],c[100],lena,lenb,lenc,i,j,x;
	memset(a,0,sizeof(a));
	memset(b,0,sizeof(b));
	memset(c,0,sizeof(c));
	scanf("%s%s",a1,b1);
	lena=strlen(a1);lenb=strlen(b1);
	for (i=0;i<=lena-1;i++) a[lena-i]=a1[i]-48;
	for (i=0;i<=lenb-1;i++) b[lenb-i]=b1[i]-48;
	for (i=1;i<=lena;i++)
	{
		x=0;     
		for (j=1;j<=lenb;j++)              
		{
			c[i+j-1]=a[i]*b[j]+x+c[i+j-1]; 
			c[i+j-1] %= 10;
		}
		c[i+lenb]=x;                                
	}
	lenc=lena+lenb;
	while (c[lenc]==0&&lenc>1)    
		lenc--;
	for (i=lenc;i>=1;i--)
		cout<<c[i];
	cout<<endl;
	return 0;
}