各位大佬，啥情况，20分

#include<bits/stdc++.h>
using namespace std;
const int N = 2e3 + 10;
char a1[N], b1[N];
int a[N], b[N], c[N << 1];
void lhxlsl(int a[N], char b[N], int n) {
    for (int i = 0; i < n; ++i) {
        a[n - i] = b[i] - '0';
    }
}
int main() {
    int lhx, lsl, ys, pa;
    scanf("%s%s", a1, b1);
    lhx = strlen(a1);
    lsl = strlen(b1);
    lhxlsl(a, a1, lhx);
    lhxlsl(b, b1, lsl);
    for (int i = 1; i <= lhx; ++i) {
        pa = 0;
        for (int j = 1; j <= lsl; ++j) {
            c[i + j - 1] = a[i] * b[i] + pa + c[i + j - 1];
            pa = c[i + j - 1] / 10;
            c[i + j - 1] %= 10;
        }
        c[i + lsl] = pa;
    }
    ys = lhx + lsl;
    while (c[ys] == 0 && ys > 1)ys--;
    for (int i = ys; i >= 1; --i) printf("%d", c[i]);
    return 0;
}

哪里哪里有毛病