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32 lines
764 B
32 lines
764 B
#include <bits/stdc++.h>
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using namespace std;
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const int N = 1e5 + 10;
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int a[N], al;
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int b[N], bl;
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void mul(int a[], int &al, int b[], int &bl) {
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int t = 0;
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int c[N] = {0};
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for (int i = 0; i < al; i++)
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for (int j = 0; j < bl; j++)
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c[i + j] += a[i] * b[j];
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al += bl;
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for (int i = 0; i < al; i++) {
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t += c[i];
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a[i] = t % 10;
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t /= 10;
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}
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// 前导0
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while (al > 0 && a[al] == 0) al--;
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}
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int main() {
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string x, y;
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cin >> x >> y;
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for (int i = x.size() - 1; i >= 0; i--) a[al++] = x[i] - '0';
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for (int i = y.size() - 1; i >= 0; i--) b[bl++] = y[i] - '0';
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mul(a, al, b, bl);
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for (int i = al; i >= 0; i--) printf("%d", a[i]);
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return 0;
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} |