60求救！！！

1号测试点WA，5号RE

#include <bits/stdc++.h>
using namespace std;

int la, lb, lans, a[1010], b[1010], c[1010], ans[1010];

void Read(int *a, int &len)
{
    string cur;
    cin >> cur;
    len = cur.length(); 
    for (int i = 0; i < len; i++)
    {
        a[len - i - 1] = cur[i] - '0'; 
    }
    return;
}

int main()
{
    Read(a, la);
    Read(b, lb);
    lans = la + lb - 1;
    for (int i = 0; i < la; i++)
    {
        for (int j = 0; j < lb; j++)
        {
            ans[i + j] += a[i] * b[j];
        }
    } 
    for (int i = 0; i <= lans; i++)
    {
        if (ans[i] > 9)
        {
            ans[i + 1] = ans[i + 1] + ans[i] / 10;
            ans[i] = ans[i] % 10;
        }
    } 
    if (ans[lans])
    {
        lans++;
    }
    for (int i = lans - 1; i >= 0; i--)
    {
        cout << ans[i]; 
    }
    return 0;
}