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#include <iostream> #include <vector> using namespace std; string multiply_big_integer(string A, string B) { int sz_a = (int) A.size(); int sz_b = (int) B.size(); vector<int> v(sz_a + sz_b, 0); for(int i = sz_a - 1; i >= 0; i--) { for(int j = sz_b - 1; j >= 0; j--) { v[i + j + 1] += (A[i] - '0') * (B[j] - '0'); } } for(int i = sz_a + sz_b - 1; i >= 0; i--) { if(v[i] > 9) { v[i - 1] += (v[i] / 10); v[i] %= 10; } } int i = 0; while(v[i] == 0) { i++; } string product = ""; for(int j = i; j < sz_a + sz_b; j++) { product += (v[j] + '0'); } return product; } int main() { string a, b; cin >> a >> b; cout << multiply_big_integer(a, b) << endl; return 0; }
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